What happens when Gypsum is heated upto 373 ∘ K (Write only chemical equation).

Gypsum(calcium sulphate dihydrate) is heated to a temperature of 373 ° K 100 ° C to prepare Plaster of Paris in a kiln. During this chemical reaction, gypsum loses three-fourths of its water of crystallisation to form calcium sulphate hemi hydrate. Therefore, the following reaction is observed- CaSO 4 . 2 H 2 O Gypsum → ∆ , 100 ° C CaSO 4 . 1 2 H 2 O Plaster of Paris + 3 2 H 2 O Water

Write chemical formula of the following- Bleaching Powder

Bleaching powder is a white powder which has a strong smell of chlorine and that is why it is known as chloride of lime. It is soluble in cold water. The molecular name of bleaching powder is calcium oxychloride and the chemical formula is CaOCl 2 . It is mainly used as disinfecting agents, bleaching cotton, preparing chloroform, etc. This can be prepared by passing chlorine gas over dry slaked lime. Therefore, the following chemical reaction will take place- Ca OH 2 Calcium Hydroxide Slaked lime + Cl 2 Chlorine → CaOCl 2 Calcium oxychloride Bleaching Powder + H 2 O Water

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Electrolysis of sodium chloride produces a gas A when A is passed through a solution of compound B another compound C is formed which is used as an oxidising agent in many chemical industries. A, B, and C will be respectively:

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Important Questions on Acids, Bases and Salts

MEDIUM

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Write only chemical equation for the reaction of preparation of bleaching powder. Give its one use also.

HARD

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What is gypsum? What happens when gypsum is heated to $373 K$ ?

EASY

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What happens when bleaching powder reacts with dil. hydrochloric acid. Write only chemical equation.

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What happens when Gypsum is heated upto

373^{\circ} K

(Write only chemical equation).

EASY

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Plaster of Paris hardens by:

EASY

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Write chemical formula of the following-

Bleaching Powder

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Which of the following is used to purify drinking water?

EASY

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What is the common name of compound

{CaOCl}_{2}

EASY

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Write any two uses of plaster of Paris.

MEDIUM

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Write the molecular formulae and two uses of bleaching powder.

EASY

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Why should we store Plaster of Paris in a moisture-proof container? Write its equation.

MEDIUM

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A compound that is prepared from gypsum has the property of hardening when mixed with the proper quantity of water. Write the chemical name of the compound.

EASY

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Write the chemical name, formula and two uses of bleaching powder.

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Answer the following:

A calcium compound having odour of chlorine is used to remove yellowish-white clothes in laundries. Name the compound.

EASY

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The real bleaching agent present in bleaching powder is

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