Answer: (C) Statements (i) and (iii)
Explanation: According to byjus.com, group VII elements are known as Halogens.
Not only that, but bbc.co.uk says " Atoms of group 7 elements all have seven electrons in their outer shell. This means that the halogens all have similar chemical reactions ."
It may just be (b) though as these are chemical reactions.
Molecular Mass of Compound.
- Molecular mass of O in compound=16(4)=64u
A proton contains 2 up quark 1 down quark and gluons which the 3 quarks exchange. Now since there is only 1 option I would choose gluon. But it's up to you.