Intext questions XI — task. Science CBSE, Class 10.

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1. Name the sodium compound which is used for softening hard water.

Sodium oxy chloride
Sodium hydroxide
Sodium carbonate
Sodium formate
Sodium iodide

2. Write an equation to show the reaction between Plaster of Paris and water.

\(CaSO_4.2H_{2}O + 1\frac{1}{2}.H_{2}O\rightarrow CaSO_4.2H_2O\)
\(CaSO_4.{2}H_{2}O + 1\frac{1}{2}.H_{2}O\rightarrow CaSO_4.3H_2O\)
\(CaSO_4.\frac{1}{2}H_{2}O + 1\frac{1}{2}.H_{2}O\rightarrow CaSO_4.3H_2O\)
\(CaSO_4.\frac{1}{2}H_{2}O + 1\frac{1}{2}.H_{2}O\rightarrow CaSO_4.2H_2O\)

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