A solution of a substance ‘X’ is used for whitewashing. (i) Name substance ‘X&rsqu

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1. Chemical Reactions and Equations

hard

A solution of a substance $‘X’$ is used for whitewashing.

$(i)$ Name the substance $‘X’$ and write its formula.

$(ii)$ Write the reaction of the substance $‘X’$ named in $(i)$ above with water.

Option A

Option B

Option C

Option D

Solution

$(i)$ The substance $'X'$ is calcium oxide. Its chemical formula is $CaO$.

$(ii)$ Calcium oxide reacts vigorously with water to form calcium hydroxide (slaked lime).

$\underset{\begin{smallmatrix}
Calcium\text{ }oxide \\
\left( Quick\text{ }lime \right)
\end{smallmatrix}}{\mathop{Ca{{O}_{(s)}}}}\,+\underset{Water~}{\mathop{{{H}_{2}}{{O}_{(l)}}}}\,\to \underset{\begin{smallmatrix}
~Calcium\text{ }hydroxide~ \\
\text{ }\left( Slaked\text{ }lime \right)
\end{smallmatrix}}{\mathop{Ca{{(OH)}_{2\left( aq \right)}}}}\,$