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1.
In the reaction, 
2.
Number of hydroxyl groups present in pyrosulphuric acid is
3.
Which is not an acid salt?
4.
In fisher-Ringe's method of separation of noble gas mixture from air, .......... Is used.
5.
The element which evolves two gases on reacting with conc.
is:
is:
6.
When conc. 
is added to dry
, brown fumes are evolved. These fumes are of:
is added to dry, brown fumes are evolved. These fumes are of:
7.
With cold and dilute sodium hydroxide fluorine reacts to give
8.
The X- X bond dissociation energy is minimum in:
9.
Which of the following is not the characteristic of interhalogen compounds?
10.
Which is soluble in water?