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1.
The percentage of para hydrogen in ordinary hydrogen increases when:
2.
Manufacture of 
is made by:
is made by:
3.
on treatment with chlorine gives:
on treatment with chlorine gives:
4.
Radioactive isotope of hydrogen is
5.
is of the order of
is of the order of
6.
The hardness of water is estimated by
7.
The 
bond angle in is
bond angle in is
8.
Hydrogen loses its electron to form 
ion. In this respect it resembles to:
ion. In this respect it resembles to:
9.
10.
The decomposition of can be slowed down by the addition of small amount of phosphoric acid which acts as:
can be slowed down by the addition of small amount of phosphoric acid which acts as: