S.P. Singh solutions for Concise Chemistry [English] Class 10 ICSE chapter 13 - Practical Work [2017 edition]

1. Give only one suitable chemical test to identify the following gases.
   1. Ammonia
   2. Sulphur dioxide
   3. Hydrogen chloride
   4. Chlorine
   5. Carbon dioxide
   6. Oxygen
   7. Hydrogen
2. Select a basic gas mentioned in Q. (a). How is the basic nature suspected?
3. Select acidic gases from the gases mentioned in Q. (a). How is the acidic nature suspected?
4. The two gases A and B are bleaching agents. A is greenish-yellow and bleaches due to its oxidizing property while B is a colourless gas that bleaches due to reduction. Identify A and B?
5. Which gas turn blue cobalt chloride paper light pink? Give one similarity in the test between
   1. Cl₂ and HCl
   2. SO₂ and CO₂.

Name the gases which extinguishes burning wooden splinters.

Name the gas which: Turns moist red litmus blue.

Name the gases which do not affect moist litmus.

Name the gas which: Affects the acidified K₂Cr₂O₇ paper and also turns lime water dirty milky.

Name two carbonates which do not produce carbon dioxide on heating.

Name a colourless gas which bleaches.

Name gases which has a sour taste.

Name a greenish-yellow gas which also bleaches.

Name gas with a rotten egg smell.

From the following list of substances choose those which meet the description given below.

Ammonium chloride, ammonium nitrate, chlorine, dilute hydrochloric acid, iron, lead nitrate, manganese (IV) oxide, silver nitrate, sodium nitrate, sodium nitrite, and sulphur.

Two compounds whose aqueous solutions give white precipitates with dilute hydrochloric acid.

Name the anion present in the following compound:

Compound A, when warmed with concentrated sulphuric acid, gives a gas which fumes in moist air and which gives dense white fumes with ammonia.

Name the anion present in the following compound:

When a barium chloride solution is added to a solution of compound B, a white precipitate insoluble in dilute hydrochloric acid is formed.

Name the anion present in the following compound:

The action of heat on the insoluble compound C produces a gas which turns lime water turbid.

Name the anion present in the following compound:

Compound D, when warmed with dilute sulphuric acid, gives a gas that turns acidified dichromate solution green.

A given white crystalline salt was tested as follows:

It dissolved in water and the resulting solution of the salt turned blue litmus red. What conclusions can be drawn for the observation?

A given white crystalline salt was tested as follows:

The addition of barium chloride solution into this solution gave a white precipitate. What conclusions can be drawn for the observation?

A given white crystalline salt was tested as follows:

A flame test on the salt gave a persistent golden-yellow colourisation. What conclusions can be drawn for the observation?

Sodium hydroxide solution is added to solution A. A white precipitate is formed which is insoluble in excess sodium hydroxide solution. What is the metal ion present in solution A?

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

When an ammonium salt is warmed with sodium hydroxide solution, a gas is evolved. State three ways in which you could identify this gas.

Complete the following table and write your observations.

Use the information given in (a) to (h) to identify the substances P to W selecting your answers from the given list.

1. P is white solid. When heated produces white fumes (sublime).
2. P and R on warming produce an alkaline gas.
3. On adding water to T, heat is evolved and R is formed.
4. Q burns brightly in the air to form T.
5. When S is heated, it gives off brown fumes and leaves a black residue of U.
6. A solution of S is formed by warming U with dilute nitric acid.
7. V is a gaseous non-metallic element that reacts with hydrogen to form W.
8. A solution of W will neutralize the solution of R.

Copy and complete the following table which refers to the action of heat on some carbonates:

Distinguish by a chemical test sodium carbonate and sodium sulphite.

Distinguish by a chemical test sodium chloride and sodium sulphide.

Distinguish by a chemical test sodium hydroxide solution and ammonium hydroxide solution.

Distinguish by a chemical test, ammonium sulphate and sodium sulphate.

Distinguish by a chemical test, sulphuric acid from nitric acid and hydrochloric acid.

Sodium hydroxide solution is added first in a small quantity, then in excess to the aqueous salt solution of copper (II) sulphate, zinc nitrate, lead nitrate, calcium chloride and iron (III) sulphate. Copy of the following table and write the colour of the precipitate in (i) to (v) and the nature of the precipitate (soluble or insoluble) in (vi) to (x).

State your observation when lead nitrate solution and sodium chloride solution are mixed.

State your observation when zinc chloride solution, zinc nitrate solution, and zinc sulphate solutions are added individually to barium chloride solution.

State your observations when zinc chloride solution, zinc nitrate solution, and zinc sulphate solutions are added individually to lead nitrate solution.

State your observation when:

Decomposition of bicarbonates by dil. H₂SO₄

2NaHCO₃ + H₂SO₄ → Na₂SO₄ + 2H₂O + 2CO₂

2KHCO₃ + H₂SO₄ → K₂SO₄ + 2H₂O + 2CO₂

Write the observation for the following:

Decomposition of bicarbonates by dil. H₂SO₄.

\[\ce{2KHCO3 + H2SO4 -> K2SO4 + 2H2O + 2CO2}\]

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 a barium chloride solution?

(II)Which two solutions will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution?

(III)Which solution will give 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 the excess of ammonium hydroxide is added to it?

(V)Which solution gives a white precipitate with an excess of ammonium hydroxide solution?

Mention the colour changes observed when the following indicators are added:

Salts A, B, C, D and E undergo reactions (i) to (v) respectively. Identify the anion present in these salts on the basis of these reactions.

1. When silver nitrate solution is added to a solution of A, a white precipitate, insoluble in dilute nitric acid, is formed.
2. The addition of dilute hydrochloric acid to B produces a gas which turns lead acetate black on paper.
3. When a freshly prepared solution of ferrous sulphate is added to a solution of C and concentrated sulphuric acid is gently poured from the side of the test tube, a brown ring is formed.
4. When dilute sulphuric acid is added to D, a gas is produced which turns acidified potassium dichromate solution from orange to green.
5. The addition of dilute hydrochloric acid to E produces effervescence. The gas produced turns lime water milky but does not affect acidified potassium dichromate solution.

The salt which in solution gives a pale green precipitate with sodium hydroxide solution and a white precipitate with barium chloride solution is ______.

Identify the following substance:

An alkaline gas A which gives dense white fumes with hydrogen chloride.

Identify the following substance:

A dilute acid B, which does not normally give hydrogen when reacted with metals but does give a gas when it reacts with copper.

Identify the following substance:

Gas C has an offensive smell like rotten eggs.

Identify the following substance:

Gas D is a colourless gas which can be used as a bleaching agent.

Identify the following substance:

Liquid E can be dehydrated to produce ethene.