(English Medium) ICSE Class 9 - CISCE Question Bank Solutions

Give reason for the following:

Destruction of ozone layer is harmful for both humans and plants.

Name or state the following:

An atmospheric pollutant responsible for both global warming and ozone depletion.

Name or state the following:

The atom which reacts with oxygen to form ozone.

State in brief the drawbacks of Rutherford's atomic model correlating them with the postulates of Bohr’s atomic model.

What do the following symbol stand for?

2H₂ 

What is a chemical equation? Why it is necessary to balance it?

State the information conveyed by the following equation:

Zn_(s) + 2HCl_(aq) → ZnCl2_(aq)  + H2 ↑

What is the limitation of the reaction given in question 2?

Write the chemical equation for the following word equation and balance them.

Carbon   + Oxygen → Carbon dioxide

Write the chemical equation for the following word equation and balance them.

Nitrogen + Oxygen → Nitrogen monoxide

Write the chemical equation for the following word equation and balance them.

Calcium + Nitrogen → Calcium nitride

Write the chemical equation for the following word equation and balance them.

Calcium oxide + Carbon dioxide → Calcium carbonate

Write the chemical equation for the following word equation and balance them.

Magnesium + Sulphuric acid → Magnesium sulphate + Hydrogen

Write the chemical equation for the following word equation and balance them.

Sodium reacts with water to form sodium hydroxide and hydrogen

Balance the following equation:

 Fe + H₂O → Fe₃O₄ + H₂

Balance the following equation:

Ca + N₂ → Ca₃N₂

Balance the following equation:

Zn + KOH → K₂ZnO₂ + H₂

Balance the following equation:

Fe₂O₃ + CO → Fe + CO₂

Balance the following equation:

PbO + NH₃ → Pb + H₂O + N₂

Balance the following equation:

Pb₃O₄ → PbO + O₂