The symbol of iron is $\mathrm{I}$.

Important Questions on Basic Chemistry

EASY

7th CBSE

IMPORTANT

New Science Spark Book 7>Chapter 1 - Basic Chemistry>Put on your THINKING CAP!>Q 2

The valency of oxygen is $2$.

MEDIUM

7th CBSE

IMPORTANT

New Science Spark Book 7>Chapter 1 - Basic Chemistry>Put on your THINKING CAP!>Q 2

Atoms of an element form a compound.

MEDIUM

7th CBSE

IMPORTANT

New Science Spark Book 7>Chapter 1 - Basic Chemistry>Put on your THINKING CAP!>Q 3

What is meant by variable valency? Give two examples of elements which have variable valency

MEDIUM

7th CBSE

IMPORTANT

New Science Spark Book 7>Chapter 1 - Basic Chemistry>Put on your THINKING CAP!>Q 3

Chemical formula of a compound made of two elements is obtained by the exchange or transposition of their valencies. Explain with an example

MEDIUM

7th CBSE

IMPORTANT

New Science Spark Book 7>Chapter 1 - Basic Chemistry>Put on your THINKING CAP!>Q 3

If the symbol for hydrogen is ‘$\mathrm{H}$’. Why is the symbol for potassium ‘$\mathrm{K}$’ instead of ‘$\mathrm{P}$’?