set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

The empirical formula and molecular mass of a compound are CH₂O and 180 g respectively. What will be the molecular formula of the compound ?

a) C₆H₁₂O₆

b) C₉H₁₈O₉

c) CH₂O

d) C₂H₄O₂

Question : 2

The observation that does not indicate a chemical reaction is

a) evolution of a gas

b) change of temperature

c) change of colour

d) None of these

Question : 3

Which of the following statements is true about chemical equation ?

a) Mass as well as atoms are conserved

b) Mass is conserved

c) Atoms are conserved

d) Molecules are conserved

Question : 4

Which of the following does not corrode when exposed to the atmosphere?

a) Gold

b) Iron

c) Copper

d) Silver

Question : 5

Which is not a balanced equation ?

a) Fe + Cl₂ ⟶ FeCl₃

b) NaOH + HCl ⟶ NaCl + H₂O

c) Mg + CuSO₄ ⟶ MgSO₄ + Cu

d) Mg + 2HNO₃ ⟶ Mg(NO₃ )₂ + H₂

Question : 6

AgNO₃(aq) + NaCl(aq) ⟶ AgCl(s) + NaNO₃(aq) Above reaction is -

a) combination reaction

b) precipitation reaction

c) double displacement reaction

d) Both (b) and (c)