Question

answer this fast... please​

Answer 1

Answer:

nitrate is $NO{3}$ - VALENCY IS -1

sulphate  $SO4\\}$  2- VALENCY IS -2

phosphate is $PO{4}$   3- VALENCY IS -3

VALENCY of group 1 elements is 2+

so ,

X [$NO{3}$] 2

X $SO4\\}$

X 3 [ $SO4\\}$ ]2

HOPE IT HELPS !!