Chemical Reactions and Equations objective questions

Chemical Reactions and Equations Objective Questions

1- Burning of a magnesium ribbon in air

(A) burns with a dazzling white flame

(B) changes into a white powder

(C) Both (A) and (B)

(D) None of the above

 

2-Burning of a magnesium ribbon in air produces

(A) Magnesium hydroxide

(B) Magnesium carbonate

(C) Magnesium dioxide

(D) Magnesium oxide

 

3-Action of dilute sulphuric acid on zinc forms

(A) oxygen gas

(B) helium gas

(C) hydrogen gas

(D) none of the above

 

4-The reactants are written on the

(A) left hand side

(B) right hand side

(C) middle

(D) any of the above

 

5- The products are written on the

(A) left hand side

(B) right hand side

(C) middle

(D) any of the above

 

6-The chemical equation is balanced if

(A) mass is same on both the sides of the equation

(B) number of atoms of each element is same on both the sides of the sides

(C) both (A) and (B)

(D) none of the above

 

7-If the mass is not the same on both sides of the equation, such a chemical equation is a

(A) dead chemical equation

(B) skeletal chemical equation

(C) Imperfect chemical equation

(D) Improper chemical equation

 

8-Which of the following is a balanced chemical equation?

(A) Zn + H2SO4 → ZnSO4 + H2

(B) Zn + H2SO4 → ZnSO4 + 2H2

(C) Zn + H2SO4 → 2ZnSO4 + H2

(D) Zn + H2SO4 → 2ZnSO4 + 2H2

 

9-Which of the following(s) can be included in a chemical equation

(A) Physical states

(B) Temperature

(C) Catalyst

(D) All of the above

 

10-Chemical equations involve

(A) the breaking of bonds

(B) the making of bonds

(C) the breaking and making of bonds

(D) the shifting of bonds

 

ANSWERS:

1-(C), 2-(D), 3-(C), 4-(A), 5-(B), 6-(C), 7-(B), 8-(A), 9-(D), 10-(C)