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Match the following items in column I with the corresponding items in column II<br>Column I - i) $$\text{Na}_2\text{CO}_3 \cdot 10\text{H}_2\text{O}$$, ii) $$\text{Mg(HCO}_3)_2$$, iii) $$\text{NaOH}$$, iv) $$\text{Ca}_3\text{Al}_2\text{O}_6$$<br>Column II - P) Portland cement ingredient, Q) Castner-Keller process, R) Solvay process, S) Temporary hardness
Washing soda $$\text{Na}_2\text{CO}_3 \cdot 10\text{H}_2\text{O}$$ is made by the Solvay process (i with R). Magnesium bicarbonate causes temporary hardness of water (ii with S). $$\text{NaOH}$$ is made by the Castner-Kellner process (iii with Q). Tricalcium aluminate $$\text{Ca}_3\text{Al}_2\text{O}_6$$ is an ingredient of Portland cement (iv with P).
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