English Medium Class 9 - CBSE Question Bank Solutions

Which of the following represents a correct chemical formula ?

The formula of a compound is X3Y. The valencies of elements X and Y will be respectively :

An element A forms an oxide A₂O₅.

What will be the formula of chloride of A ?

The formula of carbonate of a metal M is M₂CO₃.

What will be the formula of its iodide ?   

The formula of carbonate of a metal M is M₂CO₃.

What will be the formula of its nitride ?

The formula of carbonate of a metal M is M₂CO₃.

 What will be the formula of its phosphate ?

Identify the following substance:

An alkaline gas A which gives dense white fumes with hydrogen chloride.

Identify the following substance:

Gas B that has an offensive smell as of rotten eggs.

Identify the following substance:

Gas C that is colourless and can be used as a bleaching agent.

Identify the following substance:

A brown gas D with the irritating smell.

Comment on the following statements:

Sponge though compressible is a solid.

Which of the following represents a correct chemical formula? Name it.

Which of the following represents a correct chemical formula? Name it.

BiPO₄

Write the molecular formulae for the following compounds

Copper (II) bromide

Write the molecular formulae for the following compounds

Aluminium (III) nitrate

Write the molecular formulae for the following compounds

Calcium (II) phosphate

Write the molecular formulae for the following compounds

Iron (III) sulphide

Write the molecular formulae for the following compounds

Mercury (II) chloride

Write the molecular formulae for the following compounds

Magnesium (II) acetate

Write the molecular formulae of all the compounds that can be formed by the combination of the following ions

Cu²⁺, Na⁺, Fe³+, C1^– , `"SO"_4^-2`, `"PO"_4^3-`