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

Calculate the number of moles in 7g of nitrogen.

Solid ammonium dichromate decomposes as under:

\[\ce{(NH4)2Cr2O7 -> N2 + Cr2O3 + 4H2O}\]

If 63 g of ammonium dichromate decomposes. Calculate;

1. the quantity in moles of (NH₄)₂Cr₂O₇
2. the quantity in moles of nitrogen formed
3. the quantity in moles of nitrogen formed
4. the loss of mass
5. the mass of chromium (III) oxide formed at the same time.

Solid ammonium dichromate decomposes as:

\[\ce{(NH4)2Cr2O7 -> N2 + Cr2O3 + 4H2O}\]

If 63 g of ammonium dichromate decomposes. Calculate the quantity in moles of nitrogen formed.

1. A to F below relate to the source and extraction of either zinc or aluminium:
2. Bauxite
3. Coke
4. Cryolite
5. Froth floatation
6. Sodium hydroxide solution
7. Zinc blende
8. Write down the three letters each from the above list which are relevant to
9. Zinc
10. Aluminium
11. Fill in the blanks using the most appropriate words from A to F.
12. The ore from which aluminium is extracted must first be treated with ………………. so that pure aluminium oxide can be obtained.
13. Pure aluminium oxide is dissolved in ….. to make a conducting solution.

 iii. Write the formula of cryolite.

Steel is an alloy of iron and ______.

Name two metallic oxides which cannot be reduced by carbon, carbon monoxide or hydrogen.

Write a balanced equation for the reduction of copper (ll) oxide by hydrogen.

Give the equations for the reduction of copper oxide.

Give the equation for the reduction of Iron (III) oxide.

Give the equations for the reduction of Lead (II) oxide.

Give the equation for the reduction of Zinc oxide.

State the following condition required in the Haber’s process:

Temperature

Ammonia is manufactured by Haber Process.

State one possible source of each reactant used in Haber process.

Name a greenish-yellow gas which also bleaches.

Name gas with a rotten egg smell.

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.

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?