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

Write a balanced equation for the following word equation:

Calcium hydroxide + Ammonium chloride → Calcium chloride + Water + Ammonia

With reference to a chemical equation state which of the statements 1 to 5 pertain to A or B.
A: Information provided by a chemical equation. 
B: Limitations of a chemical equation.

1. The nature of the individual elements.
2. The speed of the reaction.
3. The state of matter in which the substance is present.
4. The completion of the reaction.
5. The direction of the reaction.

Fill in the blank with the correct word from the options given below:

A chemical equation is a shorthand form for a _______ change.

Give a balanced equation by partial equation method, [steps are given below].

The reaction of excess ammonia with chlorine – Ammonia as a reducing agent

1. Ammonia first reacts with chlorine to give hydrogen chloride and nitrogen.
2. Hydrogen chloride then further reacts with excess ammonia to give ammonium chloride.

Give a balanced equation by the partial equation method, [steps are given below].

Oxidation of Lead [II] Sulphide by Ozone

1. Ozone first decomposes to give molecular oxygen & nascent oxygen.
2. Nascent oxygen then oxidises lead [II] sulphide to lead [II] sulphate. 

Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.

Na₂SO₃ + HCl → 2NaCl + H₂O + SO₂

Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.

CaC₂ + N₂ → 2CaCN₂ + C

Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.

Fe₂O₃ + 2H₂ → 2Fe + 3H₂O

Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.

Cl₂ + 2H₂O + SO₂ → 4HCl + H₂SO₄

Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.

6NaOH + 3Cl₂ → 6NaCl + NaClO₃ + 3H₂O

Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.

C₂H₅OH + 3O₂ → 2CO₂ + 2H₂O

Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.

NaOH + CO₂ → Na₂CO₃ + H₂O

Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.

2H₂O + 2Cl₂ → 2HCl + O₂

Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.

3CuO + NH₃ → 3Cu + 3H₂O + N₂

Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.

PbO₂ +4HCl → PbCl₂ + H₂O + Cl₂

Write a balanced chemical equation for the following word equation:

Iron + Chlorine → Iron (III) chloride

Give the name and formula of two substances in the given case:

Liquid drying agent

Give the names and formulae of two substances

A basic drying agent

The atom of an element is made up of 4 protons, 5 neutrons and 4 electrons. What are its atomic number and mass number?

The atomic number and mass number of sodium are 11 and 23 respectively. What information is conveyed by this statement?