How many of the following statement is/are correct? (a) Solvay process is used for manufacturing sodium carbonate. (b) CaCl 2 is obtained as by product in Solvay process. (c) NH 3 can be recovered

Question

How many of the following statement is/are correct?

(a) Solvay process is used for manufacturing sodium carbonate.

(b) $CaCl_{2}$ is obtained as by product in Solvay process.

(c) $NH_{3}$ can be recovered in solvay ammonia process.

(d) $MgSO_{4} \cdot 7 H_{2} O$ is epsom salt.

(e) On hydrolysis of $Na_{2} CO_{3}$ . we get an acidic solution due to the formation of $H_{2} CO_{3}$

(f) $K_{2} CO_{3}$ can also be prepared by Solvay process.

(g) $CaCO_{3}$ can be obtained by passing excess of $CO_{2}$ through lime water.

TestHub · Accepted Answer

(a) Correct. The Solvay process is the primary industrial method for manufacturing sodium carbonate (washing soda).

(b) Correct. Calcium chloride ( $C a C l_{2}$ ) is a significant byproduct of the Solvay process.

(c) Correct. Ammonia ( $N H_{3}$ ) is regenerated from ammonium chloride ( $N H_{4} Cl$ ) in the Solvay process, making it a highly efficient and environmentally friendly method.

(d) Correct. Epsom salt is magnesium sulfate heptahydrate, $M g S O_{4} \cdot 7 H_{2} O$ .

(e) Incorrect. On hydrolysis of $N a_{2} C O_{3}$ , we get a basic solution due to the formation of $N a O H$ and $H_{2} C O_{3}$ . The strong base $N a O H$ dominates over the weak acid $H_{2} C O_{3}$ .

$N a_{2} C O_{3} (a q) + 2 H_{2} O (l) ⇌ 2 N a O H (a q) + H_{2} C O_{3} (a q)$

(f) Incorrect. Potassium carbonate ( $K_{2} C O_{3}$ ) cannot be prepared by the Solvay process because potassium bicarbonate ( $KH C O_{3}$ ) is highly soluble in water and does not precipitate out like sodium bicarbonate ( $N a H C O_{3}$ ).

(g) Incorrect. Passing excess $C O_{2}$ through limewater ( $C a (O H)_{2}$ ) first forms insoluble $C a C O_{3}$ , but then further reaction with $C O_{2}$ forms soluble calcium bicarbonate ( $C a (H C O_{3})_{2}$ ), making the solution clear again.

$C a (O H)_{2} (a q) + C O_{2} (g) \to C a C O_{3} (s) + H_{2} O (l)$

$C a C O_{3} (s) + C O_{2} (g) + H_{2} O (l) \to C a (H C O_{3})_{2} (a q)$

Therefore, statements (a), (b), (c), and (d) are correct.

The final answer is $4$

Chemistry - Complete s-block Question with Solution | TestHub

Doubts & Discussion