BASIC CONCEPTS OF PHYSICAL CHEMISTRY
Which statement is true?
- All elements are heterogeneous
- A mixture is forever heterogeneous
- Air is a homogenous mixture
- Compounds made up of a number of elements are heterogeneous
Air is a homogenous mixture
The study of numerous laws and principles governing chemical and physical changes is called _____ .
- Physical Chemistry.
- Analytical chemistry.
- Organic Chemistry.
- Inorganic chemistry.
Physical Chemistry
Which is not element?
- Silica
- Diamond
- Graphite
- Plastic sulfur
Silica
Which is not a mixture?
- Distilled water.
- Gasoline
- iodized table salt.
- Sugar dissolved in water.
Distilled water.
Which statement is false?
- An element of a substance contains only one kind of atoms.
- Homogenous mixtures are called solutions.
- Milk is a homogenous mixture.
- A compound can be decomposed into its constituents.
Milk is a homogenous mixture
A mixture of sand and ammonium chloride can be separated by
- Chromatography.
- Sublimation.
- Fractional crystallization.
- Gravity separation.
Sublimation
Calcium sulfate containing sodium sulfate as impurity is separated by which of the following?
- Fractional crystallization.
- Chromatography.
- Filtration and crystallization
- Sublimation.
Filtration and crystallization
Which is not a compound?
- Carborundum
- Marble.
- Ozone
- Quick lime
Ozone
Which is false with respect to SI units?
- Density in kg/m
- Amount of substance in mol/L
- Pressure in Pascal
- Force in Newton
Amount of substance in mol/L
Which processes results in a chemical change?
- Heating of a platinum rod.
- Dissolving of common salt in water.
- Sublimation of ammonium chloride.
- Heating of iron rod.
Heating of iron rod
What is the relationship between picometer (pm) and nanometer (nm)?
- 1 pm = 10 nm
- 1 nm = 1000 pm
- 1 pm = 100 nm
- 1 nm = 10 pm
1 nm = 1000 pm
The atmospheric pressure of one torr is equal to which of the following?
- 1 cm of Hg
- 1 mm of Hg
- 1m of Hg
- 1 atm pressure
1 mm of Hg
Which is true?
- 1L = 1m³
- 1L = 10 dm³
- 1dm³ = 10 L
- 1dm³ = 10³ cm³
1dm³ = 10³ cm³
According to ______ , The percentage of hydrogen in water and hydrogen peroxide is 11.1 and 5.9 % respectively.
- Avogadro’s law.
- Law of multiple proportion
- Law of definite proportion
- Law of conservation of mass
Law of multiple proportion
The balancing of chemical equation is based on which law?
- Avogadro’s law
- Law of definite proportion
- Law of conservation of mass
- Law of multiple proportion
Law of conservation of mass
Which liquid mixt cannot be separated by simple distillation?
- Water and ethanol
- Benzene and toluene
- Acetone and methanol
- Ethanol and methanol
Water and ethanol
Which is the most abundant element in earth’s crust?
- Aluminum
- Nitrogen
- Iron
- Oxygen
Oxygen
The isotopes of chlorine with mass number 35 and 37 exist in which ratio?
- 2:2
- 3:2
- 1:3
- 3:1
3:1
What is the value of Avogadro’s number?
- 6.02252 × 1023
- 5.024 x 1022
- 6.02200 x 1021
- 6.6230 x 10-34
6.02252 × 1023
What is the mass of one mole of an electron?
- 1.008 mg
- 0.184 mg
- 0.55 mg
- 1.637 mg
0.55 mg
Which has maximum mass?
- 12 cm of carbon dioxide
- 0.1 mole of ammonia
- 6.022 x 10 molecules of He gas
- 0.1 gram atom of nitrogen
12 cm of carbon dioxide
What is the volume occupied by 1.4 g of N2 at STP?
- 2.24 dm³
- 1.12 dm³
- 0.112 dm³
- 22.4 dm³
1.12 dm³
Total number of atoms present in 64 g of SO2 is
- 6.02 x 1022
- 64 x 6.02 x 1022
- 64 x 6.02 x 1023
- 6.02 x 1023
6.02 x 1023
What is the approximate mass of one a.m.u?
- 1.66 x 10-24 g
- 2.0 g
- 1.66 x 1021g
- 1.0 g
1.66 x 10-24 g
Which substances is helpful and used as CO2 absorber in combustion analysis?
- 50% KOH
- Dilute NaOH
- Lime water
- Mg(OH)2
50% KOH
The weights of two elements which combine with one another are in the ratio of their ____ .
- Equivalent mass
- Molecular mass
- Atomic mass
- Gram mole
Equivalent mass
The equivalent mass of KMnO4 in acidic medium (K = 39, Mn = 55, O=16)
- 31.6
- 15.8
- 158
- 3.16
31.6
Which is the atomic mass of an element?
- The actual mass of one atom of the element
- The relative mass of an atom of the element
- Theoretical mass of an atom of the element
- The average relative mass of different atoms of the element
The average relative mass of different atoms of the element
Which represents 1 gram molecule of a substance?
- 6.02 x 1024 molecules of ammonia
- 120 gram of iodine
- 40 gram of CaO
- 32 g of O2
32 g of O2
What is the number of moles of SO2 in 6.4 gram?
- 0.01
- 0.2
- 0.1
- 0.02
0.1
What is the empirical formula of oxalic acid?
- CHO2
- CH2O
- CHO
- CH2O2
CHO2
Which one of the following contains 44 maximum numbers of molecules?
- 16 gram sulfur dioxide
- 16 gram water
- 16 gram oxygen molecule
- 16 gram methane
16 gram methane
What is the mass of the electron?
- 9.1195 x 10-41 g
- 9.1095 x 10-31 kg
- 9.1095 x 10-31 mg
- 9.1095 x 10-27 kg
9.1095 x 10-31 kg
Which pairs of compound illustrate law of multiple proportions?
- CsOH. KOH
- D2O and H2O
- KI and KCI
- Benzene and ethane
Benzene and ethane
Which property is forever in whole numbers?
- Atomic number
- Atomic radius
- Atomic volume
- Atomic mass
Atomic number
Isotopes differ in which of the following?
- Properties depending on mass
- Arrangement of electrons in orbitals
- Arrangement protons in the nucleus
- Chemical properties
Properties depending on mass
The technique helpful and used to separate insoluble particles from liquid is:
- Filtration
- Crystallization
- Sublimation
- Solvent extraction
Filtration
Actual yield of a chemical reaction is forever less than the theoretical yield because of
- Reversible reactions
- All of A, B, and C
- By product formation
- Side reactions
All of A, B, and C
The process controlled by distribution law is
- Sublimation
- Solvent extraction
- Filtration
- Crystallization
Solvent extraction
Number of peaks in mass spectrum shows
- Number of protons
- Mass number
- Relative abundance
- Number of isotopes
Number of isotopes
Which substance is helpful and used as decolorizing agent?
- Silica gel
- Sulfuric acid
- Asbestos
- Animal charcoal
Animal charcoal
Which is not helpful and used as drying agent in desiccators?
- Silica gel
- CaCl2
- P2O5
- NaCl solution
NaCl solution
The separation of miscible liquids by heating due to difference in boiling points is called __ .
- Vaporization
- Sublimation
- Distillation
- Condensation
Distillation
Which is not locating reagent?
- Rubeanic acid
- CS2
- H2S
- Ninhydrin
CS2
Which is the safe and most reliable method of drying crystals?
- Furnace
- Vacuum oven
- Oven
- Desiccator
Desiccator
Which is insoluble in water but soluble in KI solution?
- Iodine
- Aspirin
- Benzoic acid
- Ether
Iodine
Mixture of NaCl and ammonium chloride is separated by which of the following?
- Filtration
- Crystallization
- Sublimation
- Solvent extraction
Sublimation
Equal volumes of different gases at any definite temperature and pressure have _____ molecules.
- Equal molecules
- Equal atoms
- Equal masses
- Equal densities
Equal molecules
Which is the most suitable locating reagent for amino acids on paper chromatography?
- H2S
- Rubeanic acid
- Sulfuric acid
- Ninhydrin
Sulfuric acid
The solid _____ is left over the filter paper.
- Filtrate
- Aliquot
- Crystals
- Residue
Residue
Which is not macromolecule?
- Sucrose
- Cellulose
- Hemoglobin
- Glycogen
Sucrose
The ideal standard of atomic mass is
- Hydrogrogen-1.008
- Carbon-12
- Chlorine-35.5
- Oxygen-16
Carbon-12
Height of a peak in mass spectrum shows ______.
- Relative abundance
- Mass number
- Number of isotopes
- Number of protons
Relative abundance
What is the approximate diameter of the atom?
- 2.0 nm
- 2.0 mm
- 2.0 cm
- 0.2 nm
0.2 nm
Which elements give single peak in mass spectrum?
- Iodine
- Chlorine
- Bromine C.
- Hydrogen
Iodine
Which is the volume occupied by 28 g of N2 at STP?
- 22.414 dm³
- 224.14 dm³
- 2.2414 dm³
- None of A, B, and C
22.414 dm³
Solvent extraction is based on which of the following?
- Distribution law
- Amount of solvent
- Law of mass action
- Amount of solute
Distribution law
The rate at which solute moves in paper chromatography depends on which of the following?
- Size of the tank
- Retardation factor of the solute
- Temperature of the experiment
- Size of the paper
Size of the tank
Which is a separation technique?
- Crystallization
- Chromatography
- Filtration
- All of A, B, and C
All of A, B, and C
Which is most convenient way of filtration?
- Sintered glass crucible
- Gooch crucible
- Filter Paper
- Fluted filter paper
Sintered glass crucible
A sample in the ionization chamber of mass spectrometer is ionized by
- Nucleus
- Protons
- Neutrons
- Electrons
Electrons
Direct conversion of solids into vapors is called ______ .
- Sublimation
- Vaporization
- Distribution
- Evaporation
Sublimation
The rate of filtration can be increased by which of the following?
- Chromatographic tank
- Desiccator
- Suction apparatus
- None of A, B, and C
Suction apparatus
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