(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

Some properties of sulphuric acid are listed below. Choose the property A, B, C or D which is responsible for the reactions (i) to (v). Some properties may be repeated:

1. Typical acid
2. Dehydrating agent
3. Non-volatile acid
4. Oxidizing agent

1. \[\ce{C12H22O11 + nH2SO4 -> 12C + 11H2O + nH2SO4}\]
2. \[\ce{S + 2H2SO4 -> 3SO2 + 2H2O}\]
3. \[\ce{NaCl + H2SO4 -> NaHSO4 + HCl}\]
4. \[\ce{CuO + H2SO4 -> CuSO4 + H2O}\]
5. \[\ce{Na2CO3 + H2SO4 -> Na2SO4 + H2O + CO2}\]

Which property of sulphuric acid accounts for its use as a dehydrating agent?

Concentrated sulphuric acid is both an oxidizing agent and a non-volatile acid. Write one equation. Each illustrates the above-mentioned properties of sulphuric acid.

The following is the typical property of dilute acid. Complete it by inserting suitable words:

\[\ce{Active metal + Acid ->  \underline{\phantom{.......}} + \underline{\phantom{.......}}}\]

The following is the typical property of dilute acid. Complete it by inserting suitable words:

\[\ce{Base + Acid ->  \underline{\phantom{.......}} + \underline{\phantom{.......}}}\]

The following is the typical property of dilute acid. Complete it by inserting suitable words:

\[\ce{Carbonate/hydrogen carbonate + Acid ->  \underline{\phantom{.......}} + \underline{\phantom{.......}} + \underline{\phantom{.......}}}\]

The following is the typical property of dilute acid. Complete it by inserting suitable words:

\[\ce{Sulphite/hydrogen sulphite + Acid ->  \underline{\phantom{.......}} + \underline{\phantom{.......}} + \underline{\phantom{.......}}}\]

The following is the typical property of dilute acid. Complete it by inserting suitable words:

\[\ce{Sulphide + Acid ->  \underline{\phantom{.......}} + \underline{\phantom{.......}}}\]

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 two carbonates which do not produce carbon dioxide on heating.

Name a colourless gas which bleaches.

Name gases which has a sour taste.

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.

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.

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.

Identify the following substance:

Gas C has an offensive smell like rotten eggs.

Define:

Alloy