Choose the best: Types of chemical reactions — task. Science CBSE, Class 10.

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Choose the best answer:

1. When \Ca(NO_3)_2\) is heated, it gives

$CaO$ ,

$NO_2$ (g) and

$O_2$ (g). The correct number of moles of

$Ca(NO_3)_2$ ,

$CaO$ ,

$NO_2$ (g) and

$O_2$ (g) are present in the reaction are respectively

$1$ , $3$ , $4$ , $1$
$2$ , $1$ , $3$ , $2$
$2$ , $2$ , $4$ , $1$
$2$ , $1$ , $1$ , $2$

2. Which one of the following involve a chemical reaction?

Evaporation of water
Keeping petrol in a china dish in open
Storing on nitrogen gas under pressure
Heating magnesium wire in the presence of air at high temperature

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