$\begin{aligned} \begin{array}{r} {NaH}_{2} {PO}_{4} \overset{}{\overset{> 240^{\circ} C}{\to}} {({NaPO}_{3})}_{3} \overset{}{\overset{625^{\circ} C}{\to}} {NaPO}_{3} \\ (Liquid melt) \\ \begin{aligned} ↓ & Rapid \\ (X) & cooling \end{aligned} \end{array} \end{aligned}$
Find the number of correct statements about (X)?
(a) $X$ is cyclic hexametaphosphate ( ${Na}_{6} P_{6} O_{18}$ ),
(b) $X$ is widely used for softening water.
(c) $X$ is long chain linear polyphosphate.
(d) $X$ is soluble in water.
(e) $X$ is known as cyclic calgon.
(f) $X$ is Graham salt.

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answer is 4.

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Detailed Solution

The reaction is,

$\begin{aligned} \begin{array}{r} {NaH}_{2} {PO}_{4} \overset{}{\overset{> 240^{\circ} C}{\to}} {({NaPO}_{3})}_{3} \overset{}{\overset{625^{\circ} C}{\to}} {NaPO}_{3} \\ (Liquid melt) \\ \begin{aligned} ↓ & Rapid \\ {({NaPO}_{3})}_{6} & cooling \end{aligned} \end{array} \end{aligned}$