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Q.

Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to

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a

$Ca {(OH)}_{2} and {MgCO}_{3}$

b

$Ca {(OH)}_{2} and Mg {(OH)}_{2}$

c

${CaCO}_{3} and Mg {(OH)}_{2}$

d

${CaCO}_{3} and {MgCO}_{3}$

answer is A.

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Detailed Solution

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$Mg {({HCO}_{3})}_{2} \overset{Boil}{\to} Mg {(OH)}_{2} + 2 {CO}_{2} ↑$

$Ca {({HCO}_{3})}_{2} \overset{Boil}{\to} {CaCO}_{3} + H_{2} O + {CO}_{2} ↑$

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