1.
Analysis of chlorophyll shows that it contains 2.68 percent magnesium. How many atoms of magnesium does 100 g of chlorophyll contain ?
2.
What will be the volume in litres of 20 g of hydrogen gas at STP?
3.
At normal temperature and pressure (NTP) what amount of manganese dioxide react with hydrochloric acid so that 100 litres of chlorine gas is obtained? (Mn = 55, O = 16, Cl = 35.5, H =1)
4.
96 grams of Magnesium on complete burning with oxygen gives -
5.
The number of molecules in one litre of water is equal to
6.
Read the Question given below
7.
The total number of atoms in a molecule of aluminium oxide is -
8.
Read the Question given below
9.
The percentage of Nitrogen in urea is about - (N = 14, H = 1, C = 12, O = 16)
10.
Read the Question given below
