Question

10. A metal 'M' forms chloride of the formula MC12. The formula of its
carbonate is
a) MCO3
b) MHCO3 c) MSO4
d) M2(PO4)3

11. The phosphate of a metal has the formula MP04. The formula of its
nitrate will be
a) MNO3
b) M2(NO3)2 c) M(NO3)
2 d ) M(NO3)3

12. Consider Magnesium and oxygen as reactants, molecules of
oxygen required to balance equation will be
a) 1
b) 2
c) 3
d) 4
​

Answer 1

10.option 1 MCO3 as the metal forming chloride i.e. MCl2 so it's valency become +2. CO3 has -1 valency after crossing both valencies formula becomes MCO3