S.P. Singh solutions for कन्साइस केमिस्ट्री [अंग्रेजी] कक्षा १० आईसीएसई chapter 13 - Practical Work [Latest 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 gases which turn moist red litmus blue.

Name the gases which do not affect moist litmus.

Name 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 [negative ion] present in the following compound:

Compound D when warmed with dilute H₂SO₄ gives a gas which turns acidified potassium 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 ammonium hydroxide is added to solution B, a pale blue precipitate is formed. This pale blue precipitate dissolves in excess ammonium hydroxide to give an inky blue solution. Name the cation present in solution B. What is the probable colour of 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.

Distinguish by a chemical test, magnesium chloride and magnesium nitrate solutions.

Sodium hydroxide solution is added first in a small quantity, then in excess to the aqueous salt solutions of copper (II) sulphate, zinc nitrate, lead nitrate, calcium chloride, and iron (III) sulphate. Copy 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.

Write the observation for the following:

Decomposition of bicarbonates by dil. H₂SO₄.

\[\ce{2NaHCO3 + H2SO4 -> Na2SO4 + 2H2O + 2CO2}\]

Write the observation for the following:

Decomposition of bicarbonates by dil. H₂SO₄.

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

State your observations when zinc carbonate is heated strongly.

The questions (i) to (v) refer to the following salt solutions listed A to F:

1. Copper nitrate
2. Iron (II) sulphate
3. Iron (III) chloride
4. Lead nitrate
5. Magnesium sulphate
6. Zinc chloride

1. Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution?
2. Which two solutions will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution ?
3. Which solution will give a white precipitate, when either dilute hydrochloric acid or dilute sulphuric acid is added to it?
4. Which solution becomes a deep/inky blue colour when excess of ammonium hydroxide is added to it ?
5. Which solution gives a white precipitate with excess 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:

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.

Match the gases in column I to the identification of the gases mentioned in column II. 

Carbon dioxide and sulphur dioxide gas can be distinguished by using ______.

Identify the substance ‘R’ based on the information given below:

The pale green solid ‘R’ turns reddish brown on heating. Its aqueous solution gives a white precipitate with barium chloride solution. The precipitate is insoluble in mineral acids.

Give one chemical test to distinguish between the following pair of compounds:

Zinc sulphate solution and Zinc chloride solution

Give one chemical test to distinguish between the following pair of compounds:

Iron (II) chloride solution and iron (III) chloride solution

Give one chemical test to distinguish between the following pair of compounds.

Calcium nitrate solution and calcium chloride solution

The compound which is responsible for the green colour formed when SO₂ is bubbled through acidified potassium dichromate solution.

Compound responsible for brown ring.

State your observation:

A piece of moist blue litmus paper.

State your observation for the following case:

Paper soaked in potassium permanganate solution is introduced into a gas jar of sulphur dioxide.

Write the equation for the following reaction:

Magnesium sulphate solution is mixed with barium chloride solution.

An aqueous salt solution used for testing sulphate radicals.

Name the gas which turns acidified potassium dichromate solution green.

Study the following observation and name the anion present in the reaction:

When a crystalline solid ‘P’ is warmed with concentrated H₂SO₄ and copper turnings a reddish brown gas is released.

Identify the anion present in the following compound: 

When a solution of compound Y is treated with silver nitrate solution a white precipitate is obtained which is soluble in excess of ammonium hydroxide solution.

Identify the anion present in the following compound.

Compound Z which on reacting with dilute sulphuric acid liberates a gas that has no effect on acidified potassium dichromate but turns lime water milky.

Identify the anion present in the following compound:

Compound L on reacting with barium chloride solution gives a white precipitate insoluble in dilute hydrochloric acid or dilute nitric acid.

State one chemical test between the following pair:

Sodium carbonate and sodium sulphite

State one chemical test between the following pair:

Ferrous nitrate and lead nitrate

State one chemical test between the following pair:

Manganese dioxide and copper (II) oxide

Give a chemical test to distinguish between the following pair of compounds:

Sodium chloride solution and sodium nitrate solution.

Give a chemical test to distinguish between the following pair of compounds:

Hydrogen chloride gas and hydrogen sulphide gas

Give one test to distinguish between the following pair of chemicals.

Zinc nitrate solution and calcium nitrate solution

Give a chemical test to distinguish between the following pair of compounds:

Carbon dioxide gas and sulphur dioxide gas

Distinguish between the given pair of compounds using the test given within brackets:

Sodium nitrate and sodium sulphite (using dilute sulphuric acid).

State your observation of the following case:

When moist starch iodide paper is introduced into chlorine gas.

State the inference drawn from the following observation :

On carrying out the flame test with a salt P a brick red flame was obtained. What is the cation in P?

State the inference drawn from the following observation:

A gas Q turns moist lead acetate paper silvery black. Identify the gas Q.

State the inference drawn from the following observation:

pH of liquid R is 10. What kind of substance is R?