ICSE ICSE Class 7 - CISCE Question Bank Solutions

Give a reason why –

Ozone is considered triatomic, but phosphorus a tetratomic molecule.

State the atomicity of the following:

Neon

State the atomicity of the following:

Oxygen

State the atomicity of the following:

Chlorine

State the atomicity of the following:

Argon

State the atomicity of the following:

Sulphur

Which of the following is a physical change?

Write the symbols and valencies of the following radicals:

1. Magnesium ion 
2. Ammonium
3. Carbonate
4. Nitrate
5. Oxide 
6. Bisulphate
7. Aluminium ion

Name the following radicals :

SO₄²

Name the following radicals :

HC0₃

Name the following radicals :

OH

Name the following radicals :

Cr₂0₇²

The valency of calcium is 2. Write the valencies of other radical in the following :

1. CaO
2. Ca(OH)₂
3. CaC0₃
4. CaCl₂

Write the names of `"CuCo"_3` compounds :

Write the names of `"NH"_4"OH"` compounds :

Write the names of `"HgO"` compounds :

Write the names of `"ZnCl"_2 ` compounds :

Write the names of ZnS compounds :

Write the names of `"H"_2"S"` compounds :

What are metalloids?