ICSE ICSE Class 7 - CISCE Question Bank Solutions

 Fill in the blank:

Atoms are _____

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An ion with positive charge is called ______

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An ion with negative charge is called _______

Balance the following equation :

Fe + H₂O → Fe₃O₄ + H₂

Define: Ions

Define: Chemical bond

Define: Mass number

Define: Relative atomic mass

What does an atom consist of ? Explain.

 Give the charge and the mass of an electron, proton and neutron present in an atom ?

Name two particles found inside the nucleus. What are they collectively called ?

State what you would observe when the following substance is heated in a glass test tube red lead.

State what you would observe when the following substance is heated in a glass test tube Copper (II) carbonate Red lead .

 Name the particles which revolve around the nucleus.

Explain the following reaction with one suitable example of Combination reactions .

What are orbits or shells ?

What is the maximum number of electrons present in:

1. first shell
2. second shell
3. third shell and
4. fourth shell

Explain the following reaction with one suitable example of Decomposition reaction

Name three non-metals/radicals which have valency -1, -2, and -3.

Explain the following reaction with one suitable example of Displacement reaction.