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Preservation of Fishes from Seas

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Question

__________is added for obtaining low temperature and for fast solidification while making ice.

A

Carbon dioxide

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B

Ammonium chloride

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C

Sodium chloride

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D

Magnesium hydroxide

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Solution

The correct option is B
Ammonium chloride

Fish are stored in large freezers for preservation. The boxes used for transport comprise of ice blocks to maintain low temperature even when they are being sold. Ammonium chloride is added to these ice blocks for obtaining low temperature and for fast solidification. Ammonium chloride is harmful for our intestine so the fish must be thoroughly washed after being bought.

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Q. Assertion :The group is determined by making a solution of the salt in water and adding ammonium chloride and ammonium hydroxide. Reason: Ammonium chloride is added to ensure low concentration of hydroxide ions.

Q. Write the balanced equation for the following reaction and add the state symbols.

(a) Magnesium, carbonate reacts with hydrochloric acid to produce magnesium chloride, carbon dioxide and water.

(b) Sodium hydroxide reacts with sulphuric acid to produced sodium sulphate and water.

Identify the odd one out and justify.

(a) Chloride, nitrate, hydride, ammonium

(b) Hydrogen chloride, sodium hydroxide, calcium oxide, ammonia

(c) Acetic acid, carbonic acid, hydrochloric acid, nitric acid

(d) Ammonium chloride, sodium chloride, potassium nitrate, sodium sulphate

(e) Sodium nitrate, sodium carbonate, sodium sulphate, sodium chloride

(f) Calcium oxide, magnesium oxide, zinc oxide, sodium oxide.

(g) Crystalline blue vitriol, crystalline common salt, crystalline ferrous sulphate, crystalline sodium carbonate.

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Q. Write the balanced chemical equations for the following reactions:
(a)

Calcium hydroxide + Carbon dioxide \underset{}{\to} Calcium carbonate + Water

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Preservation of Fishes from Seas

Standard VII Biology

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