Mohith said "H₂ differs from 2H". Justify.

In a class, a teacher asked to write the molecular formula of oxygen Shamita wrote the formula as O₂ and Priyanka as O. which one is correct? State the reason.

Imagine what would happen if we do not have standard symbols for elements?

Lakshmi gives a statement "CO and Co both represents element". Is it correct? State reason.

The formula of the water molecule is H₂O. What information you get from this formula.