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The reagent(s) used for softening the temporary hardness of water are
a) ${Ca}_{3} {({PO}_{4})}_{2}$ b) $Ca {(OH)}_{2}$ , c) ${Na}_{2} {CO}_{3}$ d) NaOCl

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Only a & b

Only b & d

Only b & c

Only a & d

answer is C.

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Detailed Solution

$Ca {({HCO}_{3})}_{2} + Ca {(OH)}_{2} \to 2 {CaCO}_{3} ↓ + 2 H_{2} O$

$MC l_{2} + {Na}_{2} {CO}_{3} \to {MCO}_{3} ↓ + 2 NaC l$

${MSO}_{4} + {Na}_{2} {CO}_{3} \to {MCO}_{3} ↓ + {Na}_{2} {SO}_{4}$

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