Boron And Aluminum MCQs [Chemistry]

Set of Important MCQs on Boron And Aluminum Chemistry in inorganic chemistry for the preparation of tests for chemistry and biology. 

AICI, acts as a strong Lewis acid because it

1. A covalent compound
2. Electron-deficient
3. Readily hydrolyzed
4. An ionic compound

Question’s Answer: Electron-deficient

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Which of the mentioned has +3 oxidation state?

1. In & Tl
2. B & Al
3. B & In
4. Al & TI

Question’s Answer: B & Al

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Which of the mentioned are oxides ores of Aluminum?

1. Corundum
2. Diaspore
3. Bauxite
4. All A, B, and C

Question’s Answer: All A, B, and C

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Which of the mentioned are sulphate ores of aluminum?

1. Kaolin
2. Cryolite
3. Feldspar
4. Alumite

Question’s Answer: Alumite

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The formula of Bauxite is

1. Al₂O₃
2. Na₃ AIF₆
3. Al₂O₃ H₂O
4. Al₂O₃ 2H₂O

Question’s Answer: Al₂O₃ 2H₂O

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The purification of Bauxite can be carried out

1. Serpek’s process
2. Hall’s process
3. Baeyer’s process:
4. None of A, B, and C

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

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In the purification of bauxite, the ore is fused with sodium carbonate in the ________  process.

1. Baeyer’s process
2. Hall’s process
3. Serpeck’s process
4. None of A, B, and C

Question’s Answer: Hall’s process

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Aluminum is helpful and used for which of the following?

1. Reducing agent
2. Making alloys
3. Making utensils & frames
4. All A, B, and C

Question’s Answer: All A, B, and C

Magnalium is alloy of aluminum and magnesium which is helpful and used in ______ .

1. Scientific apparatus.
2. Boat machinery
3. Rail road cars
4. Aircraft parts

Question’s Answer: Aircraft parts

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What is the formula of hexa borane?

1. B₄ H₁₀
2. B₅ H₉
3. B₆ H₁₀
4. B₈ H₁₂

Question’s Answer: B₆ H₁₀

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Which is an inflammable colorless gas with a sticky sweet odour and is extremely toxic?

1. B₄ H₁₀
2. B₂ H₆
3. B₅ H₉
4. B₆ H₁₀

Question’s Answer: B₂ H₆

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Diborane is helpful and used ___

1. As reducing agent

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1. For welding torches
2. For high energy fuel
3. All A, B, and C

Question’s Answer: All A, B, and C

What is the formula of Borax?

1. Na₂B₄O₇ 12H₂0
2. Na₂B₄O₇ 8H₂O
3. Na₂B₄O₇ 10H₂O
4. Na₂B₄O₇ 6H₂O

Question’s Answer: Na₂B₄O₇ 10H₂O

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What is the formula of Tetraboric acid?

1. H₂B₄O₇
2. HBO₂
3. HзBOз
4. H₆B₄O₂

Question’s Answer: H₂B₄O₇

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Boric acid is helpful and used  in ____ .

1. tanning industry
2. medicine as an antiseptic
3. manufacture of pottery glaze
4. All A, B, and C

Question’s Answer: All A, B, and C

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Borax exists in which form?

1. Borax glass
2. Octahedral borax
3. Ordinary borax
4. All A, B, and C

Question’s Answer: All A, B, and C

What is the formula of borax glass?

7. Na₂B₄O₇.10H₂O
8. Na₂B₄O₇
9. Na₂B₄O₇.5H₂O
10. None of these

Question’s Answer: Na₂B₄O₇

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Sodium tetraborate is helpful and used ______ .

1. As alkaline buffer in dying & bleaching process
2. In enameling and making glaze
3. In manufacture of optical glass
4. All A, B, and C.

Question’s Answer: All A, B, and C

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AICI₃ is helpful and used in

1. In borax bead test
2. Manufacturing of petrol
3. Preservation of food
4. All A, B, and C

Question’s Answer: Manufacturing of petrol

Which of the mentioned reacts violently with water?

1. AIH₃
2. AICl₃
3. Al₂Cl₆
4. LiAIH₄

Question’s Answer: LiAIH₄

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Alum is a _____.

1. Double salt
2. Acidic salt
3. Basic salt
4. Complex salt

Question’s Answer: Double salt

 

Boron and aluminum halides are electron-deficient compounds. In this respect, they act as

1. Oxidizing agent
2. Lewis base
3. Lewis acid

D Reducing agent

Question’s Answer: Lewis acid

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Which one of the following elements shows the most stable oxidation state of +1?

1. Al
2. TI
3. In
4. Ga

Question’s Answer: TI

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Boron exhibits diagonal relationship with which of the following?

1. Mg
2. Si
3. Al
4. Ge

Question’s Answer: Si

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Alums are generally helpful and used in ______ .

1. In dyeing and water proofing of fabric
2. In arrest bleeding
3. In water purification
4. All A, B, and C

Question’s Answer: All A, B, and C

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Boron does not form B3+ ion because  it has __________ .

1. high electronegativity
2. It has small size and high ionization energy
3. high charge density (charge/radius ratio)
4. None of these

Question’s Answer: It has small size and high ionization energy

The aqueous solution of sodium silicate is ______.

1. Acidic
2. Amphoteric
3. Basic
4. Neutral

Question’s Answer: Basic

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AICI₃ fumes in air because of

1. Hydration
2. Dehydration
3. Hydrolysis
4. Oxidation

Question’s Answer: Hydrolysis

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Which of the mentioned statements about anhydrous aluminum chloride is true?

1. It is not easily hydrolyzed
2. It exist as AlCl₃ molecules
3. It sublimes at 100°C under vacuum
4. None of these

Question’s Answer: It exist as AlCl₃ molecules

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Which of the mentioned statements is not true for both B and Al?

1. They burn in oxygen to give oxides at high temperature
2. Their halides are Lewis acids
3. They combine with nitrogen to form nitrides
4. They react with HCl to form chlorides

Question’s Answer: It exist as AlCl₃ molecules

Amorphous boron on burning in air forms __ .

1. Mixture of B₂O₃ and BN
2. Only B₂O₃
3. Only BN
4. B(OH)₃

Question’s Answer: Mixture of B₂O₃ and BN

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Which of the mentioned is expected not to exist?

1. B₅H₁₁
2. B₅H₁₀
3. B6H₁₀
4. B₅H₈

Question’s Answer: B₅H₁₀

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What is the formula of chrome yellow?

1. PbCrO₄
2. K₂CrO₄
3. K₂Cr₂O₇
4. None of these

Question’s Answer: PbCrO₄

The accurate order of atomic radii of Group IIIA elements is

1. B<Al<Ga-In
2. B<Al-Ga<In
3. B<Al<Ga<In
4. B<Ga<Al-In

Question’s Answer: B<Al-Ga<In

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In the aluminothermite process, aluminum acts as

1. An oxidizing agent
2. A flux
3. A solder
4. A reducing agent

Question’s Answer: A reducing agent

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When borax is intensely heated, it gives __________ .

1. B₂O₃
2. NaBO₂+ B₂0₃
3. NaBO₂
4. Na₂B₄O₇

Question’s Answer: NaBO₂+ B₂0₃

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Which of the mentioned forms electron deficient compounds

1. Al
2. B
3. Both B & Al
4. None of these

Question’s Answer: Both B & Al

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Which of the mentioned elements are typical non-metals?

1. B & Al
2. Al & Si
3. B & Si
4. All A, B, and C

Question’s Answer: B & Si

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The compound which does not act as Lewis acid is

1. BF₃
2. BeCl₂
3. AlCl₃
4. SnCl₄

Question’s Answer: BeCl₂

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When orthoboric acid is heated intensely, it gives  _________ .

1. HBO₂
2. H₂B₃O₇
3. B₂O₃
4. B

Question’s Answer: B₂O₃

Which of the mentioned statements is not true about potash alum?

1. Its empirical formula is KAI(SO4)2-
2. Its aqueous solution is basic in nature
3. It is helpful and used in dyeing industry
4. On heating, it melts in its water of crystallization.

Question’s Answer: Its aqueous solution is basic in nature

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Which one of the following statements regarding BF3 is not true?

1. It is a Lewis acid
2. It is an electron-deficient compound
3. It is an ionic compound

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1. It forms adducts

Question’s Answer: It is an ionic compound

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All the member of group III A are metals excluding ___________.

1. Ga
2. Al
3. B
4. In

Question’s Answer: B

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What is the valence shell electronic configuration of group III A?

1. ns¹ p²
2. ns² p³
3. ns² p¹
4. ns² p²

Question’s Answer: ns² p¹

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Which of the mentioned element gives violet color to flame?

1. Aluminum
2. Indium
3. Thallium
4. Gallium

Question’s Answer: Gallium

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The aluminium salt commonly helpful and used to stop bleeding is

1. Aluminium sulphate
2. Aluminium chloride

C.. Potash alum

1. Aluminium ‘luoride

Question’s Answer: Potash alum

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Aluminum does not corrode as does iron, because  _____ .

1. Al does not react with O₂
2. A protective layer of Al₂O₃ forms on the metal surface
3. Al is harder to oxidize than is Fe
4. Fe gives cathode protection to Al

Question’s Answer: A protective layer of Al₂O₃ forms on the metal surface

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Which of the mentioned statement is false?

1. An alloy is a mixture of two or more metals
2. An alloy is a mixture of two or more metal and non-metal elements that have metallic properties
3. An alloy has a fixed composition
4. An amalgam is an alloy containing Hg

Question’s Answer: An alloy has a fixed composition

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The role of the mineral cryolite. Na AIF, in the Hall process for aluminum production is

1. In the molten state, it is a solvent for alumina, AlgO₃
2. It is a chemical reducing agent
3. It forms a slag to remove impurities
4. It is the source of aluminum (the ore)

Question’s Answer: In the molten state, it is a solvent for alumina, AlgO₃

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The Hall process involves the reduction of Al₂O₃ to aluminum by ______ .

1. Carbon (coke)
2. Carbon monoxide
3. Electrolysis
4. Molecular hydrogen

Question’s Answer: Electrolysis

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Aluminum is an active metal, but does not corrode as iron does because

1. Al does not react with Oz
2. A protective layer of Al2O3 forms on the metal surface
3. Al is harder to oxidize than is Fe
4. Aluminum has a high tensile strength

Question’s Answer: A protective layer of Al2O3 forms on the metal surface

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Which of the mentioned is not a property of aluminum?

1. An efficient electrical conductor
2. Toxic to humans
3. Is amphoteric
4. A low density compared to other metals

Question’s Answer: Toxic to humans

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Aluminum hydroxide Al(OH)3 is ______ .

1. An amphoteric hydroxide
2. An acid
3. A base
4. An explosive hydroxide

Question’s Answer: An amphoteric hydroxide

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Which of the mentioned is not alum?

1. KAI(SO₄)₂ 12H₂O
2. NaAl(SO₄)₂ 12H₂O
3. FeAl(SO₄)₂ 12H₂O
4. NH₄Fe(SO₄)₂ 12H₂O

Question’s Answer: FeAl(SO₄)₂ 12H₂O

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Duralumin is an alloy of

1. Mg + Al+ Cu + Mn
2. Al+ Mg + Mn
3. Mg + Al+ Cu
4. Mg + Al

Question’s Answer: Mg + Al+ Cu + Mn

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Mangalium is an alloy of

1. Mg + Al+ Cu
2. Mg + Al + Mn
3. Al + Mg
4. Mg + Al + Cu + Mn

Question’s Answer: Al + Mg

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BCl3 is a planar molecule, because B atom is ________ hybridized.

1. sp-hybridized
2. sp³-hybridized
3. sp²-hybridized
4. sp³d-hybridized

Question’s Answer: sp²-hybridized

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Which of the mentioned hydroxide is amphoteric?

1. Al(OH)₃
2. B(OH)₃
3. Ga(OH)₃
4. In(OH)₃

Question’s Answer: Al(OH)₃

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Which is the chief ore of aluminum?

1. Cryolite
2. Kaolin
3. Bauxite
4. Carnalite

Question’s Answer: Bauxite

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What is the chemical formula of bauxite?

1. Al₂O₃
2. Al₂Cl₆
3. Na₃AlF₆
4. Al₂O₃.2H₂O

Question’s Answer: Al₂O₃.2H₂O

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Boric acid is added to glass, because it  _________ .

1. Makes the glass opalescent
2. Reduces the coefficient of expansion
3. Makes the glass brittle
4. Increase refractive index of the glass

Question’s Answer: Reduces the coefficient of expansion

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The true Lawis acid strength order is

1. BBr₃ > BCL₃ <BF₃
2. BCl₃ > BBr₃ > BF₃
3. BBr₃ > BCl₃ > BF₃
4. BBr₃ < BCI₃ >BF₃

Question’s Answer: BBr₃ > BCl₃ > BF₃

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In B₂H₆ molecule

1. There exists a direct B-B o-bond
2. All the atoms are in one plane
3. All the B-H bonds are normal covalent bonds
4. There exist two (three-centre two electron) bonds between the boron atoms.

Question’s Answer: There exist two (three-centre two electron) bonds between the boron atoms

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The nature of borax solution is

1. Acidic
2. Alkaline
3. Neutral
4. Amphoteric

Question’s Answer: Alkaline

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Which is the most abundant metal in earth’s crust?

1. Fe
2. Al
3. Ti
4. Ca

Question’s Answer: Al

Which is the element with maximum first ionization energy (or ionization potential)?

1. B
2. N
3. O
4. C

Question’s Answer: N

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Which metal burns in air at high temperature with the evolution of much heat?

1. Cu
2. Hg
3. Pb
4. Al

Question’s Answer: Al

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Aluminum halide is

1. White crystalline solid
2. Hygroscopic
3. Sublimes at 180°C
4. All A, B, and C

Question’s Answer: All A, B, and C

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Which librates H₂ with NaOH?

1. Zn
2. Al
3. B
4. All

Question’s Answer: All

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Group IIIA of the periodic table consist of how many elements?

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

Question’s Answer: 5

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Which of the mentioned is mineral of Al?

1. Bauxite
2. Feldspar
3. Mica
4. All A, B, and C

Question’s Answer: All A, B, and C

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