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.

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

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

A compound P is heated in a test tube with sodium hydroxide solution. A red litmus paper held at the mouth of the test tube turns blue.

Which of the following could compound P be?

Aqueous lead (II) nitrate can be distinguished from aqueous zinc nitrate by adding any of the following solutions in excess, except:

A student takes Cu, Al, Fe and Zn strips, separately in four test tubes labeled as I, II, III and IV respectively. He adds 10 ml of freshly prepared ferrous sulphate solution to each test tube and observes the colour of the metal residue in each case.

He would observe a black residue in the test tubes:

A nitrate, which forms a precipitate with ammonium hydroxide and is also soluble in excess of ______.

Dilute sulphuric acid is added to sodium sulphite. The following observations are noticed:

P A gas with a suffocating smell is evolved which turns lime water milky.

Q A foul smelling gas is evolved which turns lead acetate solution black.

R A gas is evolved which decolourises pink KMnO.

Which of the following is true?

A compound X consists of molecules. Which of the following properties will be shown by X?

P The boiling point of X is low.

Q The compound X is soluble in water.

R The aqueous solution of X does not conduct electricity.

Assertion (A): HCI can be tested by AgNO₃ solution.

Reason (R): White precipitate of AgCl is formed when AgNO₃ is added to HCl.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Assertion (A): SO₂ and CO₂ can be distinguished by lime water.

Reason (R): Both turn lime water milky.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Assertion (A): Chloride can be tested by adding concentrated sulphuric acid to it. A colourless gas with a pungent odour is evolved.

Reason (R): The gas formed is chlorine.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Assertion (A): If barium nitrate solution is added to sodium sulphate solution, a white precipitate is formed.

Reason (R): Sodium sulphate solution is white in colour.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

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

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.

Name the gas which turns acidified potassium dichromate solution green.

Name a gas which turns moist lead acetate paper silvery black.

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.

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:

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).

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

Select the correct answer from A, B, C and D.

1. Nitroso iron (II) sulphate
2. Iron (III) chloride
3. Chromium sulphate
4. Lead (II) chloride.

1. The compound which is responsible for the green colour formed when SO₂ is bubbled through acidified potassium dichromate solution.
2. Compound responsible for brown ring.

Choose from the list of substances:

Acetylene gas, aqua fortis, coke, brass, barium chloride, bronze, platinum.

An aqueous salt solution used for testing sulphate radical.

Identify:

The flame test with a salt P gave a brick red flame. What is the cation in P?

Identify:

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

A student was asked to perform an experiment in the laboratory based on the instructions given:

Observe the picture given below and state one observation for the experiment you would notice on mixing the given solution.

A student was asked to perform an experiment in the laboratory based on the instructions given:

Observe the picture given below and state one observation for the experiment you would notice on mixing the given solution.

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 В, a pale blue precipitate is formed. This pale blue precipitate dissolves in excess ammonium hydroxide giving an inky blue solution. Name the cation present in solution В.

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?

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.

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.

State your observation when a piece of moist blue litmus paper is introduced in a jar of chlorine.

State your observation for the following case:

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

State your observation of the following case:

When moist starch iodide paper is introduced into chlorine gas.

Complete the following table and write your observations.

Identify the anion present in the following compound:

Compound X on heating with copper turnings and conc. sulphuric acid liberates a reddish brown gas.

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 giving reasons if zinc and aluminium can be distinguished by heating the metal powder with a concentrated sodium hydroxide solution.

State giving reasons if calcium nitrate and lead nitrate can be distinguished by adding ammonium hydroxide solution to the salt solution.

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.

Write the equation for the following reaction:

Magnesium sulphate solution is mixed with barium chloride solution.

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

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 by a chemical test 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

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

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

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.

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.