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).

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

Standard 10
Science

Similar Questions

Start a Free Trial Now

Confusing about what to choose? Our team will schedule a demo shortly.