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Q.10 Match the following items in column I with the corresponding items in column II. Column I (i) Na2CO3.10H2O (ii) Mg(HCO3)2 (iii) NaOH (iv) Ca3Al2O6 Column II (A) Portland cement ingredient (B) Castner-Kellner process (C) Solvay process (D) Temporary hardness

1. (1) (i)→(D); (ii)→(A); (iii)→(B); (iv)→(C)
2. (2) (i)→(B); (ii)→(C); (iii)→(A); (iv)→(D)
3. (3) (i)→(C); (ii)→(B); (iii)→(D); (iv)→(A)
4. (4) (i)→(C); (ii)→(D); (iii)→(B); (iv)→(A)

Correct answer: (4) (i)→(C); (ii)→(D); (iii)→(B); (iv)→(A)

Solution

The correct option matches each compound with its appropriate process or classification: Na2CO3.10H2O is produced in the Solvay process, Mg(HCO3)2 is associated with temporary hardness in water, NaOH is produced via the Castner-Kellner process, and Ca3Al2O6 is a key ingredient in Portland cement.

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