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Subjects
Science CBSE
Class 10
Acid, bases and salts
Textbook questions

20. Textbook questions IX

Exercise condition:

4 m.

1. Plaster of Paris should be stored in a moisture-proof container. Explain why?

Plaster of Paris frequently eliminates water.
Plaster of Paris absorbs water quickly and hardens to form calcium hydroxide.
Plaster of Paris absorbs water quickly and hardens to form gypsum.
Plaster of Paris absorbs water quickly and hardens to form calcium carbonate.

2. What is a neutralisation reaction? Give two examples.

When an acid and a base react, they form salt and carbon dioxide.
When an acid and a base react, they form hydrogen gas and water.
When an acid and a base react, they form salt and water.
When an acid and a base react, they form salt and hydrogen gas.

Examples,

\(NaOH + HCl \rightarrow NaCl + H_2\)
\(Ca(OH)_2+H_2SO_4 \rightarrow CaSO_4+CO_2\)
\(Ca(OH)_2+H_2SO_4 \rightarrow CaSO_4+H_2O\)
\(NaOH + HCl \rightarrow NaCl + H_2O\)

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