The number of significant figures in the following numbers is:
 

1. 3, 3, 3
2. 3, 4, 3
3. 3, 2, 3
4. 3, 4, 4

If the density of the solution is 3.12 g ml^-1, then what will be the mass of the 1.5 ml solution in two significant figures?

Match the following physical quantities with units.

Codes

If Avogadro number ${\mathrm{N}}_{\mathrm{A}}$, is changed from $6.022\times {10}^{23}$ $mo{l}^{-1}$ to $6.022\times {10}^{20}$ $mo{l}^{-1}$ this would change:

The maximum number of atoms is present in which of the following -

1. 1 g of Mg_(s)  

2. 1 g of O_{2 (g)}

3. 1 g of Li_(s)    

4. 1 g of Ag_(s)