Question

Match the following items in column I with the corresponding items in column II.

Item I		Item II
(i)	Na2CO3.10H2O	(A)	Portland cement ingredient
(ii)	Mg(HCO3)2	(B)	Castner-Kellner process
(iii)	NaOH	(C)	Solvay process
(iv)	Ca3Al2O6	(D)	Temporary hardness

• A. (i)\(\rightarrow\)(D); (ii)\(\rightarrow\)(A); (iii)\(\rightarrow\)(B); (iv)\(\rightarrow\)(C)
• B. (i)\(\rightarrow\)(B); (ii)\(\rightarrow\)(C); (iii)\(\rightarrow\)(A); (iv)\(\rightarrow\)(D)
• C. (i)\(\rightarrow\)(C); (ii)\(\rightarrow\)(B); (iii)\(\rightarrow\)(D); (iv)\(\rightarrow\)(A)
• D. (i)\(\rightarrow\)(C); (ii)\(\rightarrow\)(D); (iii)\(\rightarrow\)(B); (iv)\(\rightarrow\)(A)

Hint:

Washing soda is made by the Solvay process, NaOH by Castner-Kellner, Mg(HCO₃)₂ causes temporary hardness and tricalcium aluminate is a cement constituent.

Answer 1

The Correct Option is D

(i) Na₂CO₃.10H₂O (washing soda) is prepared by the Solvay (ammonia-soda) process, so (i)-(C).
(ii) Mg(HCO₃)₂ is a bicarbonate that causes temporary hardness of water, so (ii)-(D).
(iii) NaOH is manufactured by the Castner-Kellner process (electrolysis of brine in a mercury cathode cell), so (iii)-(B).
(iv) Ca₃Al₂O₆ (tricalcium aluminate) is an ingredient of Portland cement, so (iv)-(A).
Answer: (4) (i)\(\rightarrow\)(C); (ii)\(\rightarrow\)(D); (iii)\(\rightarrow\)(B); (iv)\(\rightarrow\)(A)