Question

5. (a) What is variable valency?
(b) Give three examples of element
6. Write the formulae of following
(a) Sodium hydrogen carbonate
variable valency.
criss-cross method.
1.
2
(b) Ferrous sulphate
(CY Aluminium nitride
(d) Potassium sulphate
(e) Ammonium chloride
(f) Lead nitrate
(g) Ammonium phosphate
(h) Cupric oxide
(i) Calcium hydrogen sulphate
0) Zinc hydroxide
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Answer 1

Explanation:

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Metals donate electrons from their valence shell so as to form positively charged ions such that the charge on the ion is equal to its electropositive valency. In such a situation the element exhibits more than one valency (variable valency). ...