All Free Chemistry MCQs with Answers

• A. Mn2+
• B. Mg2+
• C. Zn2+
• D. None of these options are correct

Explanation: OPTION A: The activator of the phosphatase enzyme is not Mn2+ because it is not the right type of ion to activate the enzyme.OPTION B: The…

• A. Mn2+
• B. Mg2+
• C. Zn2+
• D. None of these

Explanation: Zn2+ is the activator of carbonic anhydrase.

• A. Oxidoreductase
• B. Hydrolases
• C. Ligases
• D. Transferases

Explanation: Option A is correct as dehydrogenase removes hydrogens thus oxidises the substrate, therefore it is under "oxidoreductase".

• A. Lyases
• B. Hydrolases
• C. Ligases
• D. Transferases

Explanation: Option A is correct since lyases are enzymes that catalyze the breakdown of specific covalent bonds and the removal of groups without…

• A. LDH-1.
• B. Protease.
• C. Alkaline Phosphate.
• D. None of these options is correct.

Explanation: Alkaline phosphatase is used for the diagnosis of jaundice. It is the condition in which the skin, white of the eyes, and mucous membrane…

• A. Thrombin
• B. L-asparaginase
• C. Both
• D. None iof these

Explanation: There are several types of enzymes that are currently being studied for the treatment of cancer in children.

• A. Vitamins
• B. DNA
• C. Coenzyme
• D. None

Explanation: Option C is correct.Enzymes are proteins which help to catalyze the biochemical reaction.

• A. Coenzyme
• B. Cofactor
• C. Apoenzyme
• D. Prosthetic group

Explanation: Apoenzyme is a protein part that binds to a non-protein cofactor to form an active conjugated enzyme known as the holoenzyme.

• A. Thousands
• B. Millions
• C. Hundreds
• D. Billions

Explanation: Enzymes can be denatured and precipitated with salts, solvents, and other reagents.

• A. Vitamins
• B. DNA
• C. Coenzyme
• D. None of these options are correct

Explanation: The non-protein partco-factor includes organic and metallic organic molecules and sometimes Vitamins.

• A. Coenzymes
• B. Holoenzymes
• C. None of these
• D. Both of these

Explanation: A coenzyme is defined as an organic molecule that binds to the active sites of certain enzymes to assist in the catalysis of a reaction.

• A. Hydrolases
• B. Lyases
• C. Transferases
• D. Ligases

Explanation: Ligases are enzymes capable of catalyzing the reaction of joining two large molecules by establishing a new chemical bond.Carboxylase is…

• A. Hexokinase
• B. Glucokinase
• C. Fructokinase
• D. Malonic acid

Explanation: Hexokinase is an enzyme that is used in a glycolysis process. It catalyzes the reaction by phosphorylating glucose into…

• A. Molar heat of fusion
• B. Molar heat of vapourization
• C. Molar heat of sublimation
• D. Molar heat of Evaporation

Explanation: Option A is incorrect since the molar heat of fusion is the amount of heat required to convert one mole of a substance from the solid to…

• A. Is very volatile
• B. Highly soluble in water
• C. Forms boiling mixture
• D. Forms saturated at this concentration

Explanation: When the concentration of HCl gas in water is 22.2% by weight, it forms a constant boiling mixture.At this concentration, if dilute HCl is…

• A. Acetone
• B. Ethanol
• C. Water
• D. Ethylene glycol

Explanation: Acetone evaporates much faster than water, even though its molecular mass is more than three times as much.

• A. Temperature
• B. Intermolecular forces
• C. Density of liquid
• D. Surface area of liquid

Explanation: Vapour pressure is independent of the surface area of liquid.

• A. Physical state of matter
• B. Intermolecular forces
• C. Surface area
• D. Temperature

Explanation: Option B: A liquid's vapor pressure is directly related to the intermolecular forces present between its molecules.

• A. Endothermic reaction
• B. Exothermic reaction
• C. Chemical reaction
• D. None of the above

Explanation: Evaporation does not involve the conversion of one chemical species to another (the chemical species is water throughout).

• A. Mercury pressure
• B. Glass pressure
• C. Atmospheric pressure
• D. Container pressure

Explanation: Vapor pressure is measured by taking the difference in liquid pressure and atmospheric pressure.Note: Total pressure (also called liquid…