Question

When chlorine gas is passed in lime water, it forms chemical compound 'M' (main constituent of bleaching powder) and 'N' (used for bleaching in textile industry). Identify the correct option.

• A. 'X' = \(CO_2\); 'Y' = \(HCl\)
• B. 'X' = \(HCl\); 'Y' = \(Cl_2\)
• C. 'X' = \(Cl_2\); 'Y' = \(Ca(OH)_2\)
• D. 'X' = \(Cl_2\); 'Y' = \(CaCl_2\)

Hint:

Bleaching powder is produced by the action of chlorine gas on dry slaked lime [\(Ca(OH)_2\)].
Be careful not to use liquid lime water; the reaction requires dry slaked lime to yield stable solid bleaching powder.

Answer 1

The Correct Option is C

Step 1: Recall the industrial recipe for bleaching powder.
Bleaching powder is manufactured by passing a gas over a dry solid base, this is the standard textbook preparation.
Step 2: Identify the gas and the solid.
The gas passed is chlorine, $Cl_2$, and the dry solid it is passed over is slaked lime, $Ca(OH)_2$.
Step 3: Write the reaction and name the product.
\[ Ca(OH)_2 + Cl_2 \to CaOCl_2 + H_2O \] The product, calcium oxychloride $CaOCl_2$, is the compound described in the question as M, the main constituent of bleaching powder, widely used for bleaching in the textile industry.
Step 4: Conclude.
The reactants are $Cl_2$ and $Ca(OH)_2$. \[ \boxed{X = Cl_2,\ Y = Ca(OH)_2} \]