Choose the best: Chemical reactions and equations — task. Science CBSE, Class 10.

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Choose the best answer:

1. Balance the chemical equation.

$Fe$ +

$H_2O$ →

$Fe_3O_4$ +

$4H_2$

$Fe$ + $4H_2O$ → $Fe_3O_4$ + $4H_2$
$3Fe$ + $4H_2O$ → $Fe_4O_4$ + $4H_2$
$3Fe$ + $4H_2O$ → $Fe_3O_4$ + $4H_2$
$2Fe$ + $4H_2O$ → $Fe_3O_4$ + $4H_2$

2. Choose the balanced equation for the following chemical reaction.

Calcium oxide + water→ Calcium hydroxide

$Ca_O$ + $H_2O$ → $Cu(OH)_2$
$Ca_O$ + $H_2O$ → $Ca(OH)_2$
$Ca_O$ + $H_3O$ → $Ca(OH)_2$
$Cu_O$ + $H_2O$ → $Ca(OH)_2$

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