Question

1. a white powdered solid 'x' when added to water produces a hissing sound.
(a) identify the chemical compound 'x' and give its chemical formula.
(b) how does this compound react with moist hydrogen chloride gas?
(c) write the chemical equation for the above reaction.
(d) list two important uses of compound "x".​

Answer 1

Answer :

(a) The chemical compound 'x' is, calcium oxide and its chemical formula is, $CaO$.

(b) CaO is a strong base, and HCl is a strong acid. These two substances readily reacts with and neutralise each other and form soluble salt as calcium chloride $(CaCl_2)$ and water.

(c) The chemical equation will be,

$CaO+2HCl\rightarrow CaCl_2+H_2O$

(d) The compound 'x' (Calcium oxide) is used in making the cement, used for medicinal purpose and insecticides.

Explanation :

(a) As per question, when a white powdered solid 'x' (calcium oxide, CaO) added to water then it produces a hissing sound. So,

The chemical compound 'x' is, calcium oxide and its chemical formula is, $CaO$.

(b) As we know that CaO is a strong base, and HCl is a strong acid. These two substances readily reacts with and neutralise each other and form soluble salt as calcium chloride $(CaCl_2)$ and water.

(c) The chemical equation will be,

$CaO+2HCl\rightarrow CaCl_2+H_2O$

(d) The uses of (Calcium oxide) is :

It is used in making the cement.

It is used for medicinal purpose and insecticides.