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Match the following items in column I with the corresponding items in column II. Column I Column II (i) Na 2 CO 3 .10H 2 O (A) Portland cement ingredient (ii) Mg(HCO 3 ) 2 (B) Castner-Kellner process (iii) NaOH (C) Solvay process (iv) Ca 3 Al 2 O 6 (D) Temporary hardness

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

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

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