PHYSICAL CHEMISTRY MCQs

By: Prof. Dr. Fazal Rehman | Last updated: September 13, 2024

BASIC CONCEPTS OF PHYSICAL CHEMISTRY

Which statement is true?

  1. All elements are heterogeneous
  2. A mixture is forever heterogeneous
  3. Air is a homogenous mixture
  4. 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 _____ .

  1. Physical Chemistry.
  2. Analytical chemistry.
  3. Organic Chemistry.
  4. Inorganic chemistry.

Physical Chemistry

Which is not element?

  1. Silica
  2. Diamond
  3. Graphite
  4. Plastic sulfur

Silica

Which is not a mixture?

  1. Distilled water.
  2. Gasoline
  3. iodized table salt.
  4. Sugar dissolved in water.

Distilled water.

Which statement is false?

  1. An element of a substance contains only one kind of atoms.
  2. Homogenous mixtures are called solutions.
  3. Milk is a homogenous mixture.
  4. A compound can be decomposed into its constituents.

Milk is a homogenous mixture

A mixture of sand and ammonium chloride can be separated by

  1. Chromatography.
  2. Sublimation.
  3. Fractional crystallization.
  4. Gravity separation.

Sublimation

Calcium sulfate containing sodium sulfate as impurity is separated by which of the following?

  1. Fractional crystallization.
  2. Chromatography.
  3. Filtration and crystallization
  4. Sublimation.

Filtration and crystallization

Which is not a compound?

  1. Carborundum
  2. Marble.
  3. Ozone
  4. Quick lime

Ozone

Which is false with respect to SI units?

  1. Density in kg/m
  2. Amount of substance in mol/L
  3. Pressure in Pascal
  4. Force in Newton

Amount of substance in mol/L

Which processes results in a chemical change?

  1. Heating of a platinum rod.
  2. Dissolving of common salt in water.
  3. Sublimation of ammonium chloride.
  4. Heating of iron rod.

Heating of iron rod

What is the relationship between picometer (pm) and nanometer (nm)?

  1. 1 pm = 10 nm
  2. 1 nm = 1000 pm
  3. 1 pm = 100 nm
  4. 1 nm = 10 pm

1 nm = 1000 pm

The atmospheric pressure of one torr is equal to which of the following?

  1. 1 cm of Hg
  2. 1 mm of Hg
  3. 1m of Hg
  4. 1 atm pressure

1 mm of Hg

Which is true?

  1. 1L = 1m³
  2. 1L = 10 dm³
  3. 1dm³ = 10 L
  4. 1dm³ = 10³ cm³

1dm³ = 10³ cm³

According to  ______ , The percentage of hydrogen in water and hydrogen peroxide is 11.1 and 5.9 % respectively.

  1. Avogadro’s law.
  2. Law of multiple proportion
  3. Law of definite proportion
  4. Law of conservation of mass

Law of multiple proportion

The balancing of chemical equation is based on which law?

  1. Avogadro’s law
  2. Law of definite proportion
  3. Law of conservation of mass
  4. Law of multiple proportion

Law of conservation of mass

Which liquid mixt cannot be separated by simple distillation?

  1. Water and ethanol
  2. Benzene and toluene
  3. Acetone and methanol
  4. Ethanol and methanol

Water and ethanol

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

  1. Aluminum
  2. Nitrogen
  3. Iron
  4. Oxygen

Oxygen

The isotopes of chlorine with mass number 35 and 37 exist in which ratio?

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

3:1

What is the value of Avogadro’s number?

  1. 6.02252 × 1023
  2. 5.024 x 1022
  3. 6.02200 x 1021
  4. 6.6230 x 10-34

6.02252 × 1023

What is the mass of one mole of an electron?

  1. 1.008 mg
  2. 0.184 mg
  3. 0.55 mg
  4. 1.637 mg

0.55 mg

Which has maximum mass?

  1. 12 cm of carbon dioxide
  2. 0.1 mole of ammonia
  3. 6.022 x 10 molecules of He gas
  4. 0.1 gram atom of nitrogen

12 cm of carbon dioxide

What is the volume occupied by 1.4 g of N2 at STP?

  1. 2.24 dm³
  2. 1.12 dm³
  3. 0.112 dm³
  4. 22.4 dm³

1.12 dm³

Total number of atoms present in 64 g of SO2 is

  1. 6.02 x 1022
  2. 64 x 6.02 x 1022
  3. 64 x 6.02 x 1023
  4. 6.02 x 1023

6.02 x 1023

What is the approximate mass of one a.m.u?

  1. 1.66 x 10-24 g
  2. 2.0 g
  3. 1.66 x 1021g
  4. 1.0 g

1.66 x 10-24 g

Which substances is helpful and used as CO2 absorber in combustion analysis?

  1. 50% KOH
  2. Dilute NaOH
  3. Lime water
  4. Mg(OH)2

50% KOH

The weights of two elements which combine with one another are in the ratio of their ____ .

  1. Equivalent mass
  2. Molecular mass
  3. Atomic mass
  4. Gram mole

Equivalent mass

The equivalent mass of KMnO4 in acidic medium (K = 39, Mn = 55, O=16)

  1. 31.6
  2. 15.8
  3. 158
  4. 3.16

31.6

Which is the atomic mass of an element?

  1. The actual mass of one atom of the element
  2. The relative mass of an atom of the element
  3. Theoretical mass of an atom of the element
  4. 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?

  1. 6.02 x 1024 molecules of ammonia
  2. 120 gram of iodine
  3. 40 gram of CaO
  4. 32 g of O2

32 g of O2

What is the number of moles of SO2 in 6.4 gram?

  1. 0.01
  2. 0.2
  3. 0.1
  4. 0.02

0.1

What is the empirical formula of oxalic acid?

  1. CHO2
  2. CH2O
  3. CHO
  4. CH2O2

CHO2

Which one of the following contains 44 maximum numbers of molecules?

  1. 16 gram sulfur dioxide
  2. 16 gram water
  3. 16 gram oxygen molecule
  4. 16 gram methane

16 gram methane

What is the mass of the electron?

  1. 9.1195 x 10-41 g
  2. 9.1095 x 10-31 kg
  3. 9.1095 x 10-31 mg
  4. 9.1095 x 10-27 kg

9.1095 x 10-31 kg

Which pairs of compound illustrate law of multiple proportions?

  1. CsOH. KOH
  2. D2O and H2O
  3. KI and KCI
  4. Benzene and ethane

Benzene and ethane

Which property is forever in whole numbers?

  1. Atomic number
  2. Atomic radius
  3. Atomic volume
  4. Atomic mass

Atomic number

Isotopes differ in which of the following?

  1. Properties depending on mass
  2. Arrangement of electrons in orbitals
  3. Arrangement protons in the nucleus
  4. Chemical properties

Properties depending on mass

The technique helpful and used to separate insoluble particles from liquid is:

  1. Filtration
  2. Crystallization
  3. Sublimation
  4. Solvent extraction

Filtration

Actual yield of a chemical reaction is forever less than the theoretical yield because of

  1. Reversible reactions
  2. All of A, B, and C
  3. By product formation
  4. Side reactions

All of A, B, and C

The process controlled by distribution law is

  1. Sublimation
  2. Solvent extraction
  3. Filtration
  4. Crystallization

Solvent extraction

Number of peaks in mass spectrum shows

  1. Number of protons
  2. Mass number
  3. Relative abundance
  4. Number of isotopes

Number of isotopes

Which substance is helpful and used as decolorizing agent?

  1. Silica gel
  2. Sulfuric acid
  3. Asbestos
  4. Animal charcoal

Animal charcoal

Which is not helpful and used as drying agent in desiccators?

  1. Silica gel
  2. CaCl2
  3. P2O5
  4. NaCl solution

NaCl solution

The separation of miscible liquids by heating due to difference in boiling points is called __ .

  1. Vaporization
  2. Sublimation
  3. Distillation
  4. Condensation

Distillation

Which is not locating reagent?

  1. Rubeanic acid
  2. CS2
  3. H2S
  4. Ninhydrin

CS2

Which is the safe and most reliable method of drying crystals?

  1. Furnace
  2. Vacuum oven
  3. Oven
  4. Desiccator

Desiccator

Which is insoluble in water but soluble in KI solution?

  1. Iodine
  2. Aspirin
  3. Benzoic acid
  4. Ether

Iodine

Mixture of NaCl and ammonium chloride is separated by which of the following?

  1. Filtration
  2. Crystallization
  3. Sublimation
  4. Solvent extraction

Sublimation

Equal volumes of different gases at any definite temperature and pressure have _____ molecules.

  1. Equal molecules
  2. Equal atoms
  3. Equal masses
  4. Equal densities

Equal molecules

Which is the most suitable locating reagent for amino acids on paper chromatography?

  1. H2S
  2. Rubeanic acid
  3. Sulfuric acid
  4. Ninhydrin

Sulfuric acid

The solid _____  is left over the filter paper.

  1. Filtrate
  2. Aliquot
  3. Crystals
  4. Residue

Residue

Which is not macromolecule?

  1. Sucrose
  2. Cellulose
  3. Hemoglobin
  4. Glycogen

Sucrose

The ideal standard of atomic mass is

  1. Hydrogrogen-1.008
  2. Carbon-12
  3. Chlorine-35.5
  4. Oxygen-16

Carbon-12

Height of a peak in mass spectrum shows ______.

  1. Relative abundance
  2. Mass number
  3. Number of isotopes
  4. Number of protons

Relative abundance

What is the approximate diameter of the atom?

  1. 2.0 nm
  2. 2.0 mm
  3. 2.0 cm
  4. 0.2 nm

0.2 nm

Which elements give single peak in mass spectrum?

  1. Iodine
  2. Chlorine
  3. Bromine C.
  4. Hydrogen

Iodine

Which is the volume occupied by 28 g of N2 at STP?

  1. 22.414 dm³
  2. 224.14 dm³
  3. 2.2414 dm³
  4. None of A, B, and C

22.414 dm³

Solvent extraction is based on which of the following?

  1. Distribution law
  2. Amount of solvent
  3. Law of mass action
  4. Amount of solute

Distribution law

The rate at which solute moves in paper chromatography depends on which of the following?

  1. Size of the tank
  2. Retardation factor of the solute
  3. Temperature of the experiment
  4. Size of the paper

Size of the tank

Which is a separation technique?

  1. Crystallization
  2. Chromatography
  3. Filtration
  4. All of A, B, and C

All of A, B, and C

Which is most convenient way of filtration?

  1. Sintered glass crucible
  2. Gooch crucible
  3. Filter Paper
  4. Fluted filter paper

Sintered glass crucible

A sample in the ionization chamber of mass spectrometer is ionized by

  1. Nucleus
  2. Protons
  3. Neutrons
  4. Electrons

Electrons

Direct conversion of solids into vapors is called ______ .

  1. Sublimation
  2. Vaporization
  3. Distribution
  4. Evaporation

Sublimation

The rate of filtration can be increased by which of the following?

  1. Chromatographic tank
  2. Desiccator
  3. Suction apparatus
  4. None of A, B, and C

Suction apparatus

More Physical Chemistry MCQs

  1. PHYSICAL CHEMISTRY MCQs
  2. CHEMICAL AND IONIC EQUILIBRIA MCQs
  3. NUCLEAR CHEMISTRY MCQs
  4. CHEMICAL THERMODYNAMICS MCQs
  5. NANOCHEMISTRY MCQs
  6. CHEMICAL KINETICS MCQs
  7. SURFACE CHEMISTRY MCQs
  8. COLLOIDAL STATE MCQs
  9. ELECTROCHEMISTRY MCQs
  10. SPECTROSCOPY MCQs
  11. SOLUTION CHEMISTRY AND PHASE EQUILIBRIA MCQs
  12. PHOTOCHEMISTRY AND MOLECULAR SYMMETRY MCQs
  13. CHEMISTRY MCQs From all subjects of  Chemistry
  14. Quantum Chemistry MCQs
  15. Statistical Mechanics MCQs
  16. Atomic Structure MCQs
  17. Molecular Orbital Theory MCQs
  18. Chemical Bonding MCQs
  19. Reaction Mechanisms MCQs
  20. Thermochemistry MCQs
  21. Gas Laws MCQs
  22. Solid State Chemistry MCQs
  23. Catalysis MCQs

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