ples of elements having
variable valency.
6. Write the formulae of following salts by
criss-cross method.
(a) Sodium hydrogen carbonate
(b) Ferrous sulphate
(c) Aluminium nitride
(d) Potassium sulphate
(e) Ammonium chloride
(f) Lead nitrate
(g) Ammonium phosphate
(h) Cupric oxide
(i) Calcium hydrogen sulphate
() Zinc hydroxide
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