CHEMISTRY - 9TH - CH.1

NAME OF THE STUDENT

ROLL NO.

1. Chemical equation is a short hand form of a

• PHYSICAL REACTION
• PHYSIO-CHEMICAL REACTION
• CHEMICAL REACTION
• NONE

2. What happens in a chemical reaction?

• BREAKING OF OLD BONDS
• FORMATION OF NEW BOND
• BOTH BREAKING OF OLD BONDS AND FORMATION OF NEW BONDS
• NONE

3. When the no. of atoms of each element on reactant side is not equal to the no. atoms of each element on the product side then the equation is known as

• BALANCED EQUATION
• SKELETAL EQUATION
• PARTIAL EQUATION
• NONE

4. Why should be the chemical equation balanced?

• Not to follow the law of conservation of mass
• To follow the law of conservation of mass
• Not to follow the law of conservation of mass AND To follow the law of conservation of mass
• NONE

5. Select the correct balanced equation for the given equation: Al + O2 ------> Al2O3

• Al + O2 ------> 2Al2O3
• 4 Al + 3O2 ------> 2 Al2O3
• 4Al + 2O2 ------>3 Al2O3
• NONE