Test for Ammonia

Q.

During the reaction of silver nitrate with hydrochloric acid, the white precipitate X is formed. This precipitate is insoluble in _____.

1. Ammonium hydroxide

2. Nitric acid

3. Diamine silver chloride

4. None of these

Q.

Give a chemical test to identify the following gas : Ammonia

Q.

What happens when a few drops of dilute hydrochloric acid are added to silver nitrate solution.

1. Silver chloride and water is formed.

2. Silver chloride and hydrogen is formed.

3. Silver chloride and nitric acid is formed.

4. Silver chloride and nitric acid is formed.

Q.

Passage of ammonia gas through copper sulphate solution forms pale blue precipitate.What is the precipitate?

1. It decomposes giving reddish brown gas nitrous oxide gas which imparts the colour

2. It loses its acidic action turning yellowish brown

3. It decomposes giving reddish brown gas nitrogen dioxide gas which imparts the colour

4. It decomposes giving reddish brown gas nitric oxide gas which imparts the colour

Q.

______ (Carbon dioxide/Carbon monoxide) gas dissolves in water to form carbonic acid.

Q.

When ammonium hydroxide is added to solution B, a pale blue precipitate is formed . This pale blue precipitate dissolves in excess of ammonium hydroxide giving an inky blue solution. Name the cation present in solution B.

1. Cu²⁺

2. Fe²⁺

3. Fe³⁺

4. Zn²⁺

Q.

Is carrot juice acidic or basic?

Q.

Name a gas which turns:
Moist red litmus paper blue.

Q.

Dense white fumes are obtained when a jar of HCl gas is inverted over a jar of ammonia gas. Give reasons

Q.

Which two gases each change the colour of damp red litmus paper?

1. Ammonia and Hydrogen Chloride

2. Ammonia and Chlorine

3. Carbon Dioxide and Sulphur Dioxide

4. Carbon Dioxide and Chlorine

Q.

A white powder is added while baking bread and cakes to make them soft and fluffy. What is the name of the powder? What are the main ingredients in it? What are the functions of each ingredient?

Q.

What is the odour of chlorine?

Q.

Which of the following gas brings tears to eyes?

1. Hydrogen chloride

2. Ammonia

3. Nitrogen

4. Oxygen

Q.

Identify the anion present in the salt on the basis of the reaction given below:

When silver nitrate solution is added to a salt solution, a white precipitate, insoluble in dilute nitric acid, is formed.

1. Sulphite

2. Sulphide

3. Nitrate

4. Chloride

5. Oxide

6. Carbonate

7. Bromide

8. Iodide

Q.

Explain why H₂O₂ is stored in black painted glass bottles?

Q.

What is the action of litmus on :
(a) Dry ammonia gas (b) Solution of ammonia gas in water

Q.

What happens when dilute nitric acid is added to the clear solution of diamine silver(I) chloride?

1. Silver nitrate is formed.

2. Silver nitrite is formed.

3. Silver chloride is formed.

4. Hydrochloric acid is formed.

Q. Choose the correct answer:
The salt which in solution gives a pale green precipitate with sodium hydroxide solution and a white precipitate with barium chloride solution is:
A. Iron (III) sulphate
B. Iron (II) sulphate
C. Iron (II) chloride
D. Iron (III) chloride

Q.

How is ammonia identified by three ways?

Q. The questions (i) to (v) refer to the following salt solutions listed (a) to (f):
(a) Copper nitrate
(b) Iron (II) sulphate
(c) Iron (III) chloride
(d) Lead nitrate
(e) Magnesium sulphate
(f) Zinc chloride

(i) Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution?
(ii) Which two solution will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution?
(iii) Which solution will give a white precipitate when either dilute hydrochloric acid or dilute sulphuric acid is added to it?
(iv) Which solution becomes a deep/inky blue colour when excess of ammonium hydroxide is added to it?
(v) Which solution gives a white precipitate with excess ammonium hydroxide solution?

Q.

Which of the following gas is a colourless gas which also bleaches?

1. H₂S

2. SO₂

3. SO₃

4. O₂

Q.

What happens to moist red litmus paper put in a flask containing ammonium gas?

1. Remains red
2. Turns blue
3. Turns green
4. Turns pink

Q. A white solid A when heated with sodium hydroxide solution, gives a pungent gas B, which turns red litmus blue. The solid, when dissolved in dilute nitric acid and treated with silver nitrate gives a white precipitate of C which is soluble in an ammonia solution.
Identify A, B and C. Give equations to show the reactions involved.

Q.

Which of the following reagents could be used to distinguish between dilute nitric acid and dilute hydrochloric acid?

1. Copper(II) Carbonate

2. Aqueous Barium Chloride

3. Aqueous Silver Nitrate

4. Aqueous Sodium Hydroxide

Q.

State one relevant observation when crystals of copper nitrate are heated in a test tube.

Q. Which of the following gases produce dense white fumes on reacting with ammonia gas?

1. $S{O}_2$
2. $C{O}_2$
3. $HCl$
4. $H_{2}S$

Q.

State one reason why tap water is not used to prepare a solution of silver nitrate in the laboratory.

Q. Using sodium hydroxide solution, how will you distinguish:
(a) zinc nitrate solution from calcium nitrate solution?
(b) iron (II) chloride from iron (III) chloride?
(c) lead hydroxide from magnesium hydroxide?

Q.

Identify the salts P from the observation given below:

On performing the flame test salt P produces a lilac-colored flame and its solution gives a white precipitate with silver nitrate solution, which is soluble in ammonium hydroxide solution.

Q. Three test tubes contain calcium nitrate solution, zinc nitrate solution and lead nitrate solution respectively. Each solution is divided into two portions (i) and (ii). Describe the effect of
(i) adding sodium hydroxide solution to each portion in turn till it is in excess.
(ii) adding ammonium hydroxide to each portion in turn till it is in excess.