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

Which of the following would weight the least?
[Atomic masses : Ag = 108, N - 14, O = 16,C = 12]

Consider the following reaction and based on the reaction answer the questions that follow :
\[\ce{(NH4)2Cr2O7 ->[heat] N2(g) + 4H2O(g) + Cr2O3}\] 
Calculate :
(i) The quantity in moles of (NH₄)₂Cr₂O₇ if 63 gm of (NH₄)₂Cr₂O₇ is heated.
(ii) The quantity in moles of nitrogen formed.
(iii) The volume in litres or dm³ of N₂evolved at STP.
(iv) The mass in grams of Cr₂O₃ formed at the same time
[Atomic masses : H = 1, Cr=52, N=14]

Calculate the number of gram atoms in 4.6 grams of sodium (Na = 23)

A gas cylinder can hold 1 kg of hydrogen at room temperature and pressure.
(a) Find the number of moles of hydrogen present
(b) What weight of CO₂can the cylinder hold under similar conditions of temperature and pressure? (H = 1 C = 12, O = 16)
(c) If the number of molecules of hydrogen in the cylinder is X, calculate the number of CO₂ molecules in the cylinder with the same conditions of temperature and pressure.
(d) State the law that helped you to arrive at the above result.

Give reason for the following:
Carbon anodes are used in the electrolytic extraction of aluminium.

Give equation for the following conversion:  Ferric oxide to iron.

Give equation for the following conversion: Aluminium hydroxide to aluminium oxide.

Give equation for the following conversion: Aluminium to aluminium nitride.

Give equation for the following conversion:Aluminium to sodium aluminate.

Name oxide of one metal which is reduced by (give equation): Reduction with carbon

Name oxide of one metal which is reduced by (give equation): Electrolytic reduction

Name oxide of one metal which is reduced by (give equation): Reduction with heat alone

For the reaction of a metal oxide. Suggest a reducing agent other than carbon

Give the chemical name and formula of ‘cryolite’.

what is the function of cryolite in the extraction of aluminium, other than acting as a solvent for bauxite?

Name a non-metallic element which forms acidic and neutral oxides

Name a non-metallic element which has a metallic lustre

Name a non-metallic element which is a liquid at ordinary temperatures

Name a non-metallic element which is a conductor of electricity.

With reference to the reduction of copper (II) oxide , iron (II) oxide, lead (II) oxide and magnesium oxide; place the oxides in order of increasing ease of reduction.[i.e. first write the oxide that is most difficult to reduce and at last, the oxide, that is most easily reduced.]