D-Block Elements MCQs [Chemistry]

Set of Important MCQs on Chemistry of D-Block Elements in inorganic chemistry for the preparation of tests.

Transition elements, in general, exhibit the following properties, except one. Name that property

1. Natural radioactivity
2. Variable oxidation state
3. Tendency to form complexes
4. Formation of alloys

Question’s Answer: Natural radioactivity

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Zeigler-Natta catalyst is

1. Pt/PtO
2. Pt/Rh
3. TiCl₄/Al(C₂H₅)₃
4. Pt

Question’s Answer: TiCl₄/Al(C₂H₅)₃

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The most stable oxidation state of chromium is

1. +6
2. +3
3. +4
4. +2

Question’s Answer: +3

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Which of the mentioned statements is not true regarding nomenclature of coordination complexes?

1. The cation is named first and then anion
2. The anion is named first and then cation
3. Ligands are named in alphabetical order
4. The names of the anionic ligands ends in the suffix-o

Question’s Answer: The anion is named first and then cation

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Which is the substance helpful and used for cancer therapy?

1. Co
2. Fe
3. Ni
4. Rn

Question’s Answer: Co

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Molten iron withdrawn from the blast furnace is known as _________ .

1. Pig iron
2. Wrought iron
3. Bessemer iron
4. Stainless steel

Question’s Answer: Pig iron

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Pig iron is also known as

1. Stainless steel
2. Steel
3. Wrought iron
4. Cast iron

Question’s Answer: Cast iron

In the extraction of iron, the furnace change consists of iron ore, coke and limestone. The function of limestone is to act as

1. An oxidizing agent
2. Flux
3. A reducing agent
4. Slag

Question’s Answer: Flux

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If steel is heated to a temperature well below red heated and is then cooled slowly, the process is known as

1. Nitriding
2. Quenching
3. Tempering
4. Annealing

Question’s Answer: Annealing

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The bonding in transition metal complex was not well understood until the pioneer work of

1. PS Jaiswal
2. Alfred Werner
3. BR Thukral
4. GS Manku

Question’s Answer: Alfred Werner

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The correct formula form of the coordination compounds is

1. [Pt(NH₃)₆] Cl₄
2. PtCl₄, 6NH₃
3. Both A & B
4. None of A, B, and C

Question’s Answer: [Pt(NH₃)₆] Cl₄

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Which of the mentioned is neutral ligand?

1. CO & NO
2. H₂O
3. NH₃
4. All A, B, and C

Question’s Answer: All A, B, and C

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The suffix “ate” at the end of the name of the complex signifies that it is

1. Cation
2. Neutral
3. Anion
4. None of A, B, and C

Question’s Answer: Anion

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CoCl₃ 6NH₃ has six NH₃ molecules that fulfills which valence of the Co³⁺ metal ion?

1. Secondary
2. Primary
3. Both A & B
4. None of A, B, and C

Question’s Answer: Secondary

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Which of the mentioned is soluble in water?

1. Agl
2. AgCl
3. AgBr
4. AgF

Question’s Answer: AgF

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Gold dissolves in aqua regia forming

1. HAuCl₄
2. Au(NO₃)₃
3. AuCl₃
4. AuCl

Question’s Answer: HAuCl₄

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Zinc oxide is

1. A basic oxide
2. An acidic oxide
3. An amphoteric oxide
4. A neutral oxide

Question’s Answer: An amphoteric oxide

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The number of d-electrons of [Cr(H₂O)₆]³⁺ ion is

1. 2
2. 3
3. 4
4. 5

Question’s Answer: 3

The maximum oxidation shown by manganese is ________ .

1. +2
2. +4
3. +7
4. +5

Question’s Answer: +7

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What is the Oxidation state of the chromium in [Cr(NH₃)₆]₃ complex ion?

1. +3
2. +2
3. +4
4. +5

Question’s Answer: +3

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Which of the mentioned shows maximum number of oxidation states in 3d series?

1. Co
2. Ni
3. Mn
4. Zn

Question’s Answer: Mn

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What type of bonding occurs in d-block elements?

1. Ionic
2. Covalent
3. Metallic
4. Both B & C

Question’s Answer: Both B & C

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Metals are _______.

1. Ductile
2. Malleable
3. Hard
4. All A, B, and C

Question’s Answer: All A, B, and C

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Which of the mentioned statements is true about transition metals?

1. Tendency to form complexes
2. Some are helpful and used as catalyst
3. Some metals exhibit color
4. None of A, B, and C

Question’s Answer: None of A, B, and C

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Which of the mentioned cations is colorless?

1. Ni⁺²
2. Zn⁺²
3. Cu⁺²
4. Fe⁺²

Question’s Answer: Zn⁺²

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According to CFT, the metal ligand bond considered to be ionic to percentage is

1. 80%
2. 90%
3. 100%
4. 70%

Question’s Answer: 100%

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What is the composition of brass alloy?

1. Cu-Ni
2. Cu-Zn-Ni
3. Cu-Zn-Sn
4. Cu-Zn

Question’s Answer: Cu-Zn

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The composition of bronze alloy is

1. Cu-Ni
2. Cu-Zn-Ni
3. Cu-Zn
4. Cu-Zn-Sn

Question’s Answer: Cu-Zn-Sn

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VBT does not explain

1. Heat of formation
2. Color of transition metal ion
3. Absorption spectra
4. All A, B, and C

Question’s Answer: All A, B, and C

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The color of transition metals is due to

1. Ionization
2. n-n transitions
3. d-d transitions
4. Loss of s electron

Question’s Answer: d-d transitions

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Which of the mentioned cations has greatest number of unpaired electrons?

1. Mn²⁺
2. Co²⁺
3. Fe²⁺
4. Ni²⁺

Question’s Answer: Mn²⁺

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On the basis of CFT the bonding between the metal and ligand is totally

1. Coordinate
2. Covalent
3. Ionic
4. Metallic

Question’s Answer: Ionic

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CFT can very well explain

1. Spectra of transition metal
2. Magnetic properties
3. Color
4. All A, B, and C

Question’s Answer: All A, B, and C

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In group theory, the triply degenerate set is denoted by

1. t₂g
2. eg
3. e₂g
4. tg

Question’s Answer: t₂g

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The energy gap between t₂g and eg sets in denoted by

1. Å
2. 10 Dq
3. Both A & B
4. 1Dq

Question’s Answer: Both A & B

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The composition of German silver alloy is

1. Cu-Ni
2. Cu-Zn-Sn
3. Cu-Zn
4. Cu-Zn-Ni

Question’s Answer: Cu-Zn-Ni

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The maximum absorption in [Ti(OH₂)₆]³⁺ take place at wavelength of

1. 5000 Å
2. 4000 Å
3. 6000 Å
4. 10000 Å

Question’s Answer: 5000 Å

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[Ti(OH₂)₆]³⁺ gives color

1. Green
2. Purple
3. Red
4. Blue

Question’s Answer: Purple

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If the absorbed light is green the transmitted light will be

1. Violet
2. Orange
3. Purple
4. Red

Question’s Answer: Purple

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The secondary valency of Co in CoCl₃.6NH₃

1. 2
2. 6
3. 4
4. 8

Question’s Answer: 6

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Which of the mentioned has maximum number of unpaired electrons?

1. Fe²⁺
2. Fe³⁺
3. Co²⁺
4. Co³⁺

Question’s Answer: Fe³⁺

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The electronic configuration of chromium is 4s¹ 3d⁵. The element tungsten (W) belongs to the same group and has atomic number = 74. The configuration of its valence shell is

1. 5s¹ 4d¹
2. 6s¹ 5d⁵
3. 6s² 5d⁴
4. 6s⁰ 5d⁶

Question’s Answer: 6s² 5d⁴

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Pick out the incorrect statement transition metals.

1. Zn2 is not a transition metal ion
2. Transition metals do not exhibit variable oxidation states
3. Transition metal ions are colored
4. Transition metals and majority of their compounds are paramagnetic

Question’s Answer: Transition metals do not exhibit variable oxidation states

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What is the Number of unpaired electrons in Cu2+ ions?

1. 6
2. 1
3. 3
4. 3.4

Question’s Answer: 1

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The color of Ni ion is

1. Deep green
2. Green
3. Blue
4. Orange

Question’s Answer: Blue

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The central metal atom or ion and the ligands that are directly attached to it are enclosed in a square bracket known as

1. Coordination sphere
2. Coordination number
3. Coordination complex
4. All of the above

Question’s Answer: Coordination sphere

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Which one of the following statements is not true?

1. Transition metals form alloys
2. Transition metals form complexes
3. Zn, Cd and Hg are typical transition metals
4. K₂(PtCl₆) is a well-known compound

Question’s Answer: Zn, Cd and Hg are typical transition metals

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Which of the mentioned exist as liquid at room temperature?

1. Co
2. Hg
3. Mn
4. Cu

Question’s Answer: Hg

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Which one of the following is not ligand?

1. NH₃
2. H₂O
3. CN
4. CH₃COO

Question’s Answer: CH₃COO

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Which of the mentioned is not a neutral ligand?

1. CN
2. H₂O
3. CO
4. NH₃

Question’s Answer: CN

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The yellow color of chromates changes to orange-red on acidification, due to the formation of

1. Cr³⁺
2. Cr₂O₃
3. CrO₃
4. Cr2O₇^2-

Question’s Answer: Cr2O₇^2-

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Which of the mentioned is a chelate ligand?

1. Oxalate ion (en)
2. Glycinate ion
3. Ethylenediamine
4. All A, B, and C

Question’s Answer: Glycinate ion

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Which of the mentioned species do not act as ligand in the formation of complexes?

1. H⁺
2. OH^–
3. CH₃NH₂
4. CI^–

Question’s Answer: H⁺

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Which of the mentioned complex ions has no d-electron in the central metal atom?

1. [Co(NH₃)₆]³⁺
2. [Fe(CN)₆]^3-
3. [MnO₄]
4. [Co(H₂O) ₆] ³⁺

Question’s Answer: [MnO₄]

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Finely divided iron combines with CO to give

1. Fe₂(CO)₉
2. Fe(CO)₅
3. Fe₃(CO)₁₂
4. Fe(CO)₆

Question’s Answer: Fe(CO)₅

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Which of the mentioned is not correct?

1. Rusting of iron can be stopped by increasing the concentration of CO₂ in water
2. Rusting of iron is electrochemical in nature
3. Rusting of iron takes place in moist air
4. Rusting of iron produces hydrated iron (III) oxide

Question’s Answer: Rusting of iron can be stopped by increasing the concentration of CO₂ in water

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The rusting of iron is catalysed by Which of the mentioned?

1. Fe
2. O₂
3. H
4. Zn

Question’s Answer: H

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Which of the mentioned alloys contains(s) Cu and Zn?

1. Brass
2. Bronze
3. Gun-metal
4. German silver

Question’s Answer: Brass

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The number of unpaired electrons in Fe²⁺ (atomic number = 26) is

1. 3
2. 2
3. 5
4. 4

Question’s Answer: 4

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Color in transition metal compounds is attributed to

1. Small-sized metal ions
2. Incomplete (n-1) d sub-shell
3. Complete ns sub-shell
4. Absorption of light in UV region

Question’s Answer: Incomplete (n-1) d sub-shell

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Which one of the following ions is colorless?

1. N²⁺
2. Co²⁺
3. Cu⁺
4. Fe³⁺

Question’s Answer: Cu⁺

Which of the mentioned statements is false about transition metals?

1. They form complexes
2. They show variable valency
3. All transition metal compounds are paramagnetic
4. They form colored ions

Question’s Answer: All transition metal compounds are paramagnetic

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What is the coordination number of Ni in nickel-DMG complex?

1. 4
2. 3
3. 6
4. 2

Question’s Answer: 4

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What is the cation that does not form an ammine complex with excess of ammonia?

1. Cu²⁺
2. Ag⁺
3. Al³⁺
4. Cd²⁺

Question’s Answer: Al³⁺

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The EAN of Ni in Ni(CN)₄^2- is _______ .

1. 35
2. 34
3. 36
4. 38

Question’s Answer: 34

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What is the effective atomic number of Fe in Fe(CO)₅?

1. 36
2. 26
3. 35
4. 54

Question’s Answer: 36

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Which is the correct value of x in Cr(CO)_x?

1. 2
2. 4
3. Unpredictable
4. 6

Question’s Answer: 6

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Which of the mentioned do not have variable valency?

1. Mn
2. Zn
3. Ni
4. Cr

Question’s Answer: Zn

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How many no of unpaired electrons are present in Fe⁺²?

1. 4
2. 2
3. 3
4. 1

Question’s Answer: 4

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The oxidation state of Mn is highest in ______ compound?

1. MnO
2. MnO₂
3. KMnO₄
4. None of A, B, and C

Question’s Answer: KMnO₄

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Elements in which differentiating electron enters the (n-1)ch d-orbitals of the (n-1)th main shell are known as elements

1. -block
2. p-block
3. f-block
4. d-block

Question’s Answer: d-block

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Which of the mentioned is non-typical transition metal?

1. Cr
2. Mn
3. Zn
4. Co

Question’s Answer: Zn

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Which of the mentioned statements is true regarding transition metals?

1. They conduct heat and electricity
2. They are ductile
3. They are hard and malleable
4. All A, B, and C

Question’s Answer: All A, B, and C

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What is the effective atomic number of V in hexacarbonylvanadium (O)?

1. 34
2. 35
3. 36
4. 37

Question’s Answer: 35

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What is the number of ions produced by the complex [Co(NH₃)₄ Cl₂)Cl?

1. 4
2. 7
3. 2
4. 6

Question’s Answer: 2

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The IUPAC name of K₃[Co(NO₂)₆] is

1. Potassium hexanitrocobaltate (III)
2. Potassium (1) hexanitrocobaltate (III)
3. Potassium hexanitrocobalt (0)
4. Potassium(1) hexanitrocobaltate (II)

Question’s Answer: Potassium hexanitrocobaltate (III)

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Stainless steel contains

1. Cu + C + Ni
2. Fe + Ni + Cu
3. Fe + Cr + Cu
4. Fe + Cr + Ni

Question’s Answer: Fe + Cr + Ni

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The atomic and ionic radii value ______ on moving from left to right in the series.

1. Increase
2. Does not change
3. Decrease
4. None of A, B, and C

Question’s Answer: Decrease

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Which is the trace metal present in insulin?

1. Mn
2. Co
3. Fe
4. Zn

Question’s Answer: Zn

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The IUPAC name of [Ni(CN)₄]^2- is

1. Tetracyanonickel (0) ion
2. Tetracyanonickelate(II) ion
3. Tetracyanonickelate(0) ion
4. Tetracyanonickel (II) ion

Question’s Answer: Tetracyanonickel (0) ion

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The IUPAC name of [Pt(NH₃)₄.(NO₂)CI]SO₄

1. Tetraamminechloronitroplatinum(II) sulfate
2. Tetraamminechloronitroplatinum(IV) sulfate
3. Chlorotetraamminenitroplatinum(IV) sulafte
4. Chloronitrotetraammineplatinum(IV) sulfate

Question’s Answer: Tetraamminechloronitroplatinum(IV) sulfate

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Which type of complex is Vitamin B₁₂?

1. Cobalt (II) ion
2. Nickel (II) ion
3. Cobalt (III) ion
4. Chromium (III) ion

Question’s Answer: Cobalt (III) ion

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Which of the mentioned is not an example of double salt?

1. Hypo
2. Feric alum
3. Mohr’s salt
4. Potash alum

Question’s Answer: Hypo

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Which of the mentioned is not correct for [Co(NH₃)₆]Cl₃

1. It gives white ppt with AgNO₃
2. It is diamagnetic
3. It is not colorless
4. It is paramagnetic

Question’s Answer: It is paramagnetic

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The common ligands can be arranged in order of their increasing splitting power to cause d-orbitals splitting. This series is known as as

1. Electro-chemcial
2. Spectro-chemical
3. Physico-chemical
4. Spectro-electrical

Question’s Answer: Spectro-chemical

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Which are not considered member of d-block elements?

1. Hg
2. Cd
3. Zn
4. All A, B, and C

Question’s Answer: All A, B, and C

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CFSE (high spin) for d⁷ ion is

1. -1.8
2. -0.8
3. 0.8
4. 1.8

Question’s Answer: 0.8

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Which of the mentioned d-block elements can show highest oxidation number in its compounds?

1. Cr
2. Mn
3. Zn
4. Co

Question’s Answer: Mn

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Which of the mentioned does not act as ligand?

1. NH₄⁺
2. C₆H₅NH₂
3. NH₂NH₂
4. C₂H₅NH₂

Question’s Answer: NH₄⁺

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Which of the mentioned statements about the complex [Co(F₆)]^3- is correct?

1. Cobalt involves d²sp³ hybridization
2. Cobalt is in +2 oxidation state
3. F is in zero oxidation state
4. Cobalt involves sp³ d2 hybridization

Question’s Answer: Cobalt involves sp³ d2 hybridization

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Which compound is formed when excess KCN is added to aqueous solution of copper sulfate?

1. Cu(CN)₂
2. K₃[Cu(CN)₄]
3. K[Cu(CN)₂]
4. K₂[Cu(CN)₄]

Question’s Answer: K₃[Cu(CN)₄]

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Fe (CO)₅ is helpful and used as for explosive mixture with _____

1. Air
2. Water
3. N₂
4. He

Question’s Answer: Air

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Which type of complex is Hemoglobin?

1. Chromium (III) complex
2. Iron (III) complex
3. Cobalt (II) complex
4. Iron(II) complex

Question’s Answer: Iron(II) complex

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Which type of complex is Chlorophyll?

1. Iron complex
2. Cobalt complex
3. Magnesium complex
4. Chromium complex

Question’s Answer: Magnesium complex

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The geometry of Ni(CO)₄ is

1. Tetrahedral
2. Square planar
3. Octahedral
4. Angular

Question’s Answer: Tetrahedral

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Which of the mentioned statements about the complex [Cr(NH3)6] Cl is incorrect?

1. The complex involves d²sp³ hybridization
2. It gives white ppt with AgNO3
3. The complex is paramagnetic
4. The complex is diamagnetic

Question’s Answer: The complex is diamagnetic

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Bonding in metal carbonyls follows  _______ .

1. Octet rule
2. 18 electron rule
3. EAN rule
4. All A, B, and C

Question’s Answer: All A, B, and C

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Physical evidence that support the multiple nature of M-CO bonds is/are

1. X ray study
2. Vibrational spectra
3. Bond length
4. All A, B, and C

Question’s Answer: All A, B, and C

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Ru(CO)₅ and Ni(CO)₄ are ______ at room temperature

1. Gases
2. Solids
3. Liquids
4. Vapors

Question’s Answer: Liquids

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The IUPAC name of [Ni(CO) Jis

1. Tetracarbonylnickel(II)
2. Tetracarbonynickelate(II)
3. Tetracarbinylnickelate(0)
4. Tetracarbinylnickel(0)

Question’s Answer: Tetracarbinylnickel(0)

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Mn₂(CO)₁₀ is crystalline solid having

1. Light yellow color
2. Golden yellow color
3. Brown color
4. Blue color

Question’s Answer: Golden yellow color

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Bridging is most common for the metals of

1. Alkali metals
2. 2^nd transition series
3. 1^st transition series
4. lanthanides

Question’s Answer: 1^st transition series

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Carbonyl halides are usually

1. Yellow solids
2. White solids
3. Both A and B
4. Green solids

Question’s Answer: Both A and B

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What are the oxidation states of central metal ions in majority of the complexes?

1. Low positive
2. Negative
3. Zero
4. All A, B, and C

Question’s Answer: All A, B, and C

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Which of the mentioned ligands is isoelectronic with CO?

1. NO
2. PR₃
3. PF₅
4. NO⁺

Question’s Answer: NO⁺

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What is the frequency of vibration of C-0 stretching bond in metal carbonyls?

1. 1850-3100 cm^-1
2. 1850-2100 cm^-1
3. 1850-4100 cm^-1
4. 1000-1750 cm^-1

Question’s Answer: 1850-2100 cm^-1

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Which of the mentioned is true with regard to metals forming complexes of pi- acceptors?

1. Metals are in low/zero oxidation state
2. The d-orbitals contain some electrons
3. Metals have partially filled d-orbitals
4. All A, B, and C

Question’s Answer: All A, B, and C

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What is the number of electrons around Mo atom in Mo(CO)₆?

1. 6
2. 15
3. 22
4. 18

Question’s Answer: 18

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What is the geometry of Ni(CO)₄?

1. Tetrahedral
2. Octahedral
3. Square plannar
4. Pyramidal

Question’s Answer: Tetrahedral

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What is the geometry of Fe(CO)₅?

1. Square plannar
2. Trigonal
3. Tetrahedral bipyramidal
4. Octahedral

Question’s Answer: Trigonal

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What is the geometry  of Cr(CO)₆?

1. Square plannar
2. Octahedral
3. Tetrahedral bipyramidal
4. Trigonal

Question’s Answer: Octahedral

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1. Which of the mentioned carbonyl is bridging in nature?
2. Ir₂(CO)₈
3. Fe₂(CO)₉
4. Mn₂(CO)₁₀
5. All A, B, and C

Question’s Answer: All A, B, and C

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Which of the mentioned methods are helpful and used to prepare metal carbonyls?

1. Decomposition
2. Reductive carbonylation
3. Direct synthesis
4. All A, B, and C

Question’s Answer: All A, B, and C

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Which of the mentioned is/are derivatives of metal carbonyls?

1. Carbonylate anions
2. Craonyl halides
3. Carbonyl Hydrides
4. All A, B, and C

Question’s Answer: All A, B, and C

The metal complexes containing NO are known as

1. Metal carbonyls
2. Carbonyl nitrosyls
3. Metal nitrosyls
4. All A, B, and C

Question’s Answer: Question’s Answer: Metal nitrosyls

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The metal complexes containing NO+ and CO are known as _____ .

1. Carbonyl nitrosyls
2. Metal nitrosyls
3. Metal carbonyls
4. All A, B, and C

Question’s Answer: Carbonyl nitrosyls

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9. Inert Gases MCQs
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