Question

which of the following Substance becomes
hard when water is added to it?
ca(oh)2,caso4.1/2h2o,cacl2caso4.2ho​

Answer 1

Answer:

option 2 is the answer

Explanation:

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Answer 2

Answer:

CaSO₄.1/2 H₂O becomes hard when water is added in it.

therefore, the option (b) is correct.

Explanation:

CaSO₄.1/2 H₂O  is the chemical formula of Plaster of Paris.

• Plaster of Paris is a chemical substance that is mostly used for sculpting and in gauze bandages.
• Plaster of Paris is a white color powder which is actually hydrated Calcium Sulfate.
• It is obtained from Calcining Gypsum on heating  at a very high temperature (393K).
• $2CaSO_4.2H_2O\;\;(heated\; at\; 393 K)\longrightarrow \;2(CaSO_4).\frac{1}{2}H_2O + H_2O$
• Plaster of Paris (POP) has a extraordinary property of setting with water. On mixing it with water, it forms a plastic mass that gets into a hard solid within 5 to 15 minutes.

Characteristics of Plaster of Paris:-

• Plaster of Paris (POP) has fire resistance quality and ideal for heat insulation.
• POP is non-flammable.
• POP forms a very thick surface, it can resist normal knocks after get dry.
• POP does not expand much on setting.

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