Some Basic Conc...

The National Physical Laboratory is situated at:

The number of molecules in 1 L of oxygen and 1 L of nitrogen at STP will be:

When an inflated tyre bursts, the air escaping out will:

Number of water molecules in one litre of pure water is :

Photo-electric cell is not used in:

$$5.6$$ litres of a monoatomic gas at S.T.P contain :

Number of molecules in one litre of water is :

In chulhas, gaps are left between the logs:

What is the percentage by weight of sulphuric acid if 13 g of H$$_2$$SO$$_4$$ is dissolved to make 78 g of solution?

Calculate the (w/W)% of 10 g of potassium hydroxide in 40 g of solvent.