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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