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

Correct the statement, if required.

Under the same conditions of temperature and pressure, equal volumes of all gases contain the same number of atoms.

Define a covalent bond.

Calculate the number of oxygen atoms in 0.10 mole of Na₂CO₃ . 10H₂O.

Calculate the number of gram atoms in 4.6 gram of sodium.

From the equation for burning of hydrogen and oxygen

\[\ce{2H2 + O2 -> 2H2O}\] (Steam) 

Write down the number of mole (or moles) of steam obtained from 0.5 moles of oxygen.

Calculate the number of moles in 7g of nitrogen.

Solid ammonium dichromate decomposes as:

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

If 63 g of ammonium dichromate decomposes. Calculate the quantity in moles of (NH₄)₂Cr₂O₇.

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.