general concepts of chemistry - Category wise Question and Answer Practice Test with Solutions

Question : 16

Which of the following is most unreactive ?

a) Mg²⁺

b) Mg

c) Mg⁺

d) All above species are inert

Question : 17

Select the one that represents a displacement reaction.

a) HCl + NaOH ⟶ NaCl + H₂O

b) NaCl + AgNO₃ ⟶ AgCl + NaNO₃

c) Zn + CuSO₄ ⟶ ZnSO₄ + Cu

d) C + O₂ ⟶ CO₂

Question : 18

An organic compound containing C, H and N gave the following analysis : C = 40% ; H = 13.33% ; N = 46.67% Its empirical formula would be

a) CH₄N

b) C₂H₇N₂

c) CH₅N

d) C₂H₇N

Question : 19

Which of the following is not an endothermic process?

a) Dissolving conc. H₂ SO₄ in water

b) Boiling of water

c) Dissolving salts in water

d) Evaporation of water

Question : 20

Chemical equations are balanced in accordance with the

a) Law of definite composition

b) Dalton’s law

c) Law of conservation of mass

d) None of these