WBCS Mains Chemistry Physical Chemistry, Electrochemistry Questions 2023

Q. Which one of the following is most likely to exhibit Tyndall effect?
(A) Sugar and water mixture
(B) Potash alum and water mixture
(C) Chalk powder and water mixture
(D) Potassium permanganate and water mixture

Correct Answer: (C) Chalk powder and water mixture

Q. Which transitions are studied by UV spectrometer?
(A) Rotational
(B) Electronic
(C) Nuclear
(D) Vibrational

Correct Answer: (B) Electronic

Q. A non-volatile solid is added to water. Its boiling point will
(A) Decrease
(B) Increase
(C) Not change
(D) Not to be predicted

Correct Answer: (B) Increase

WBCS Mains Chemistry Physical Chemistry, Electrochemistry Questions 2022

Q. In clinical laboratory thin layer chromatography (TLC) is used to identify:
(A) Illicit drugs
(B) Poisons
(C) Inks
(D) All of the above

Correct Answer: (D) All of the above

Q. Which of the following functions as a primary standard?
(A) KMnO₄
(B) K₂Cr₂O₇
(C) Sodium Thiosulphate
(D) EDTA

Correct Answer: (B) K₂Cr₂O₇

Q. In a chemical reaction, catalyst changes
(A) Potential energy of the products
(B) Potential energy of the reactants
(C) Heat of reaction
(D) Activation energy of the reaction

Correct Answer: (D) Activation energy of the reaction

Q. Which one of the following is not colloid?
(A) Milk
(B) Smoke
(C) Blood
(D) Urea

Correct Answer: (D) Urea

WBCS Mains Chemistry Physical Chemistry, Electrochemistry Questions 2021

Q. In a hydrogen-oxygen fuel cell between the two electrodes occurs to
(A) Generate heat
(B) Create P.D. between the two electrodes
(C) Produce high purity water
(D) Remove absorbed oxygen

Correct Answer: (B) Create P.D. between the two electrodes

Q. A mixture which boils off like a single pure component is called
(A) Eutectic
(B) Azeotrope
(C) Ideal solution
(D) Non-ideal solution

Correct Answer: (B) Azeotrope

Q. Value of universal gas constant, R, depends upon
(A) Temperature of the gas
(B) Volume of gas
(C) Number of moles of gas
(D) None of the above

Correct Answer: (D) None of the above

Q. Action of catalyst depends on
(A) Mass
(B) Solubility
(C) Particle size and surface area
(D) None of the above

Correct Answer: (C) Particle size and surface area

WBCS Mains Chemistry Physical Chemistry, Electrochemistry Questions 2020

Q. Flame photometry is a suitable method for the determination of
(A) Heavy metals
(B) Dissolved gases
(C) Dissolved organics
(D) Alkali metals

Correct Answer: (D) Alkali metals

WBCS Mains Chemistry Physical Chemistry, Electrochemistry Questions 2019

Q. Which one of the following is wrong about molecularity of a reaction?
(A) It may be whole number or fractional.
(B) It is calculated from reaction mechanism.
(C) It is the number of molecules of the reactants taking part in a single step chemical reaction.
(D) It is always equal to the order of elementary reaction.

Correct Answer: (A) It may be whole number or fractional.

WBCS Mains Chemistry Physical Chemistry, Electrochemistry Questions 2018

Q. When electricity is passed through an electrolyte, it undergoes
(A) Physical changes
(B) Chemical changes
(C) No physical or chemical changes
(D) Dissociation into cation and anion

Correct Answer: (B) Chemical changes

Q. Smoke is a colloidal suspension of
(A) Negatively charged carbon particles in air
(B) Positively charged carbo-cation particles in air
(C) Inert particles of carbon black in air
(D) None of the above

Correct Answer: (C) Inert particles of carbon black in air

WBCS Mains Chemistry Physical Chemistry, Electrochemistry Questions 2017

Q. The redox indicator used in volumetric titration is
(A) Bromophenol Blue
(B) Methyl Orange
(C) Barium diphenylamine sulphonate
(D) Solochrome Black-T

Correct Answer: (C) Barium diphenylamine sulphonate

Q. The BET study is performed to measure
(A) Particle size distribution
(B) Specific surface area
(C) Dielectric constant
(D) Specific gravity

Correct Answer: (B) Specific surface area

Q. Reverse of swelling of gel is known as
(A) Syneresis
(B) Intestine
(C) Adrenal gland
(D) Blood

Correct Answer: (A) Syneresis

Q. Forward chemical reactions happen only if
(A) ΔG = 0
(B) ΔG > 0
(C) ΔG < 0
(D) None of the above

Correct Answer: (C) ΔG < 0

WBCS Mains Chemistry Physical Chemistry, Electrochemistry Questions 2015

Q. When a lead storage cell is charged
(A) Sulphuric Acid is consumed
(B) Sulphuric Acid is formed
(C) Lead sulphate is formed
(D) Lead is consumed

Correct Answer: (B) Sulphuric Acid is formed

Q. The temperature above which a real gas cannot be liquefied is known as
(A) Critical temperature
(B) Boyle temperature
(C) Inversion temperature
(D) None of the above

Correct Answer: (A) Critical temperature