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Litmus

Cold sodium h...

Question

Cold sodium hydroxide solution to the suspected ammonium salt releases a basic gas?

A

Ammonia

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B

Chlorine

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C

Sodium chloride

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D

Both

A

and

B

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Solution

The correct option is A Ammonia
Cold sodium hydroxide solution to the suspected ammonium salt releases a smelly ammonia and red litmus turns blue, Ammonia gas is evolved because of alkali-free ammonia from its salts.
$N H_{(a q)}^{4 +} + O H_{(a q)}^{-} \to N H_{3 (g)} + H_{2} O_{(l)}$

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Similar questions

Q. State the effect of adding a small amount of a] sodium hydroxide b] ammonium hydroxide followed by an excess in each case to samples of each of the salt solutions:
Sodium nitrate solution and sodium chloride solution.

(a) Give the $p^{H}$ value of pure water. Does it change if common salt is added to it?

(b) Classify the following solutions as acids, bases or salts.

Ammonium hydroxide, barium chloride, sodium chloride, sodium hydroxide, $H_{2} S O_{4}$ and $H N O_{3}$ .

Q. Write balanced equations for the following reactions:
(i) Iron (II) chloride solution with sodium hydroxide solution.
(ii) Chlorine and cold dilute sodium hydroxide solution.
(iii) Zinc and sodium hydroxide solution.
(iv) Sulphur dioxide and sodium hydroxide solution.
(Give the equation for the formation of the normal salt).

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.

(h) Sodium chloride, potassium hydroxide, acetic acid, sodium acetate.

Give a chemical test to distinguish between the following :

(a) Ammonium chloride and sodium chloride,

(b) Ferric salt and ferrous salt,

(c) Sodium sulphate and ammonium sulphate.

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