set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

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 : 3

The formula of sodium pyrophosphate is

a) Na₄ P₂O₇

b) Na₂ P₂O₇

c) Na₃ PO₄

d) Na₃ PO₃

Question : 4

When electrons are added the resulting ion is called

a) neutral radical

b) basic radical

c) acidic radicals

d) None of these

Question : 5

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

a) Gold

b) Iron

c) Copper

d) Silver

Question : 6

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