Chemistry (General Concepts) MCQs with Answers

Past Paper MCQ

A substance which produces hydrogen ion (H+) in the aqueous solution is called?

• A.Acid
• B.Base
• C.Salt
• D.None of these

Purity of solid substances can be checked by ?

• A.Boiling point
• B.Solubility
• C.Density
• D.Melting point

When bases are dissolved in water, they are known as ?

• A.Acids
• B.Alkalis
• C.Salts
• D.Oxides

An element MH₃ forms a hydride containing 90% of M by mass. What is the relative atomic mass of M?

• A.27
• B.31
• C.24
• D.14

Which of the following has minimum hydrogen bonding?

• A.Water
• B.Ethanol
• C.Ether
• D.Ammonia

Total mass of the reactants and products will remain conserved during a chemical reaction, this statement is called _?

• A.Law of constant composition
• B.Law of definite proportions
• C.Law of multiple proportions
• D.Law of conservation of mass

In 1869 Mendeleev put forward his periodic law about _?

• A.Atomic Density
• B.Atomic Number
• C.Atomic Volume
• D.Atomic Mass

The general formula for alkynes is?

• A.CₙH₂ₙ₊₂
• B.CₙH₂ₙ
• C.CₙH₂ₙ₋₂
• D.CₙH₂ₙ₋₁

The force of repulsion is greatest between which of the following?

• A.Lone pair - Lone pair
• B.Bond pair - Bond pair
• C.Lone pair - Bond pair
• D.All of these have equal repulsion

Stronger the oxidizing agent, greater is the _?

• A.Oxidation number
• B.Reduction potential
• C.Atomic radius
• D.Ionization energy