All Free Chemistry MCQs with Answers

• A. Q
• B. S
• C. P
• D. None of these

Explanation: The p-block is on the right side of the standard periodic table and encompasses elements in groups 13 to 18.

• A. C - F
• B. C - Cl
• C. C - I
• D. C - Br

Explanation: C-I bond is the longest bond of all the options as atomic radius increases down the group, iodine is furthest down hence minimum bond…

• A. When both attractive and repulsive forces are balanced
• B. When attractive forces overcome repulsive forces
• C. When repulsive forces are negligible
• D. When repulsive forces exceed attractive forces

Explanation: Explanation:Bond is formed when either the attraction and repulsion are equal or the force of attraction is greater than repulsion.

• A. Option A
• B. Option B
• C. Option C
• D. Option D

Explanation: Boyles law states that at a fixed temperature, the volume of gas is inversely proportional to the pressure exerted by the gas.

• A. HCL and HN03.
• B. H3P04.
• C. Both A and B
• D. Both HCI and 2COOH.

Explanation: Concentrated sulphuric acid has a high boiling point (356°C). So, it is considered to be non-volatile.

• A. Option A
• B. Option B
• C. Option C
• D. Option D

Explanation: Explanation:During protonation, the double bond between the carbon and oxygen is broken.

• A. Acid
• B. Base
• C. Amphoteric
• D. Neutral

Explanation: Acids are substances that release hydrogen ions (H+) when dissolved in water.

• A. H2SO4(aq) + H2O(l) --> H+ + SO42-
• B. H2SO4(aq) + H2O(l) --> H+(aq) + HSO4-
• C. H2SO4(aq) + H2O(l) --> 2H+ + SO42-
• D. H2SO4(aq) + H2O(l) --> H3O+ + SO42-

Explanation: The 1st ionisation equation involves dissociation of 1 H+ ion from H2SO4, followed by second H+ dissociation in the second ionisation.

• A. Pressure will become one half
• B. The volume will be increased
• C. Temperature has no effect on freely moving molecules
• D. Colliding capability of molecule will become lower

Explanation: According to Charles's law, the volume occupied by a fixed amount of gas is directly proportional to its absolute temperature, if the…

• A. A non-polar organic solvent
• B. Water
• C. Sulfuric acid
• D. Silver nitrate

Explanation: The correct answer is a non-polar organic liquid. In paper chromatography, the mobile phase is typically a non-polar organic solvent that…

• A. Elemental Analysis
• B. Qualitative Analysis
• C. Industrial Purification
• D. Structural Analysis

Explanation: Explanation:Chromatography is very useful for organic synthesis for separation, purification, and isolation of products.

• A. Sublimation
• B. Filtration
• C. Chromatography
• D. Solvent extraction

Explanation: A is incorrect as sublimation purifies solids rather than identify themB is incorrect as filtration separates insoluble solutes from…

• A. Acid number
• B. Iodine number
• C. Saponification number
• D. None of these

Explanation: Iodine value, also called Iodine Number, in analytical chemistry, a measure of the degree of unsaturation of oil, fat, or wax; the amount…

• A. Condensation
• B. Polymerization
• C. Cyclization
• D. Catenation

Explanation: Catenation is the ability of an element to bond with itself to form long chains or rings.

• A. Prosthetic Group
• B. Hydrogen Bonding
• C. Aldehyde Group
• D. Peptide Linkage

Explanation: Explanation:In conjugated protein molecules, the protein is attached or conjugated to some non-protein group which is called prosthetic…

• A. 25
• B. 27
• C. 21
• D. 23

Explanation: Explanation:In proteins, there are on the average 27 amino acid units for each turn in helix.

• A. Neutral
• B. Acidic
• C. Amphoteric
• D. Basic

Explanation: A is incorrect as lysine is not neutral.B is incorrect as lysine is not acidic.C is incorrect as lysine is not amphoteric.D is correct as…

• A. Simple proteins
• B. Derived proteins
• C. Polyamides
• D. Polysaccharides

Explanation: A is correct as collagen and albumin are simple proteins,upon hydrolysis they produce amino acids only.B is incorrect as derived proteins…

• A. Glycine
• B. Serine
• C. Glutamine
• D. Lysine

Explanation: The amino acids having amino and carboxyl group attached to the same carbon, i.e, alpha-carbon atom is called alpha-amino acids.

• A. Any H-atom in the molecule
• B. Same carbon atom
• C. Alternate carbon atoms
• D. Neighboring carbon atoms

Explanation: α-Amino acids are simple molecules that are made of a central C-atom, that is bound to a primary amine group NH2 and to a carboxylic group…