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

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The correct answer is:
(i) $\rightarrow$ (C); (ii) $\rightarrow$ (D); (iii) $\rightarrow$ (B); (iv) $\rightarrow$ (A)
(i) $\mathrm{Na}_{2} \mathrm{CO}_{3} \cdot 10 \mathrm{H}_{2} \mathrm{O} \rightarrow$ Solvay process
(ii) $\mathrm{Mg}\left(\mathrm{HCO}_{3}\right)_{2} \rightarrow$ Temporary hardness
(iii) $\mathrm{NaOH} \rightarrow$ Castner-Kellner process
(iv) $\mathrm{Ca}_{3} \mathrm{Al}_{2} \mathrm{O}_{6} \rightarrow$ Portland cement
(ii) $\mathrm{Mg}\left(\mathrm{HCO}_{3}\right)_{2} \rightarrow$ Temporary hardness
(iii) $\mathrm{NaOH} \rightarrow$ Castner-Kellner process
(iv) $\mathrm{Ca}_{3} \mathrm{Al}_{2} \mathrm{O}_{6} \rightarrow$ Portland cement
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