Question

plz solve 6, 8, ?, , , ...................................​

Answer 1

6) In a compound XY2 the first element X should be a metal and second should be a non metal and cant be interchanged as metal gives electrons and non metal gains electrons.

Ex CaCl2 here Ca ( metal) , Cl ( non metal)

MgCl2 here Mg ( metal) , Cl( non metal)

8) since ammonia is a gas a dry litmus paper cant be used to fine the pH of that compound. So a moist litmus should be used.