First slide

Hardness of water

Question

Statement 1 : Calogen is used in manufacture of soft water being used for laundry purpose.
Statement 2 : ${Ca}_{}^{2 +} and {Mg}^{2 +}$ ions present in hard water are rendered ineffectively by calgon forming their soluble complexes.

Moderate

A

Both Statement 1 and Statement 2 are true.
B

Statement 1 is true and statement 2 is false.
C

Statement 1 is false and Statement 2 is true.
D

Both Statement 1 and Statement 2 are false.

Solution

$\begin{array}{l} 2 {CaSO}_{4} + {Na}_{2} [{Na}_{4} {({PO}_{3})}_{6}] \to {Na}_{2} [{Ca}_{2} {({PO}_{3})}_{6}] + 2 {Na}_{2} {SO}_{4} \\ 2 {MgSO}_{4} + {Na}_{2} [{Na}_{4} {({PO}_{3})}_{6}] \to {Na}_{2} \underset{Complex salts}{[{Mg}_{2} {({PO}_{3})}_{6}] + 2 {Na}_{2} {SO}_{4}} \end{array}$

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