Question

An element 'Z' forms the following compound when it reacts with hydrogen, chlorine, oxygen and phosphorus. ZH3, ZCl3, Z2O3. (a) how to find valency of element Z?​

Answer 1

Answer: 'Z' is an element of group 13

and valency is +3

Explanation:  as H has valency is +1 and we know in a compound there is a criss cross of valencies which means valency of  Z is +3 and same in ZCl3 and Z2O3 gives us an idea that Z has +3 valecy as in all cases H,Cl,O have 3 as no. of compounds.

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Answer 2

Answer:

1.) The valency of ‘Z’ is 3.

2.) Element ‘Z’ is a metal .

Explanation:

1.) when we criss cross the valency of H3 to Z so it's valency come out to be 3 .

2.) because it is electropositive and is reacting with non-metals