Answer is A???
Density of gas b should be given
I m getting 6/x
Where x is density of gas b
I think the volume is given to find out the density of B
But for this mole of B should also be given
I agree with @Ankith_2020 . Answer is Option C
It is given in ncert only there are 4 columns. In 2 column eatch crystal bravais lattice is given