The Consecutive members of an alkane homologous series differ by

• A) CH
• B) CH2
• B) CH2 C) CH3
• D) CnHn

Which of the followings is composed of the elements, H, O, Al, and Si?

• A) Urea
• B) Silica
• C) Bauxite
• D) Clay

The mass number of a nucleus is?

• A. Always less than its atomic number
• B. The sum of the number of protons and neutrons present in the nucleus
• C. Always more than the atomic weight
• D. A fraction

What happens to the value of the equilibrium constant (Kc) for a reaction if the reaction is reversed?

• A. It becomes zero
• B. It becomes negative
• C. It remains the same
• D. It becomes the reciprocal of the original value

The atomic weight of nitrogen is?

• A. 10
• B. 12
• C. 14
• D. 16

Which of the following statements about a chemical system in equilibrium is correct/ The

• A. reaction is irreversible
• B. reaction goes to completion
• C. equilibrium is re-established when a stress is applied
• D. equilibrium position is affected by catalyst

Which of the following pollutants is biodegradable?

• A. Domestic sewage
• B. Metal scraps
• C. Radioactive waste
• D. Plastic foil

Which of the following is an acid salt?

• A. NH₄CI
• B. MgSO₄ 7H₂O
• C. CH₃COONa
• D. NaHCO₃

To make coloured glasses, small quantities of oxides of metals which form coloured silicates are often added to the reaction mixture consisting of Na2CO3 and SiO2. Such a metals is a?.

• A. pottasium
• B. barium
• C. zinc
• D. copper

Which of the following chlorides is insoluble in water?

• A. AgCI
• B. KCI
• C. NH₄CI
• D. ZnCI₂