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The formula of sodium thiosulphate is?

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a

\begin{aligned} {Na}_{2} S_{2} O_{3} \cdot H_{2} O \end{aligned}

b

\begin{aligned} {Na}_{2} S_{2} O_{3} \cdot 3 H_{2} O \end{aligned}

c

\begin{aligned} {Na}_{2} S_{2} O_{3} \cdot 5 H_{2} O \end{aligned}

d

\begin{aligned} {Na}_{2} S_{2} O_{3} \cdot 7 H_{2} O \end{aligned}

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detailed solution

Correct option is C

The inorganic chemical sodium thiosulfate has the formula ${Na}_{2} S_{2} O_{3} \times H_{2} O$ . Usually, it can be found as the pentahydrate ${Na}_{2} S_{2} O_{3} \cdot 5 H_{2} O,$ which is white or colourless. The solid is a well-dissolving efflorescent crystalline material.

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