Question

LAGIll Zinc Oxide plus lydrogen cyanide yields vins cyanide plus water , N, 10. Sort the following atoms or lons into Isoelectronic groups: Ca. Al", Sr, Na".0",K". Mg.s, C Ar, F. Ne, P

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Answer 1

C) ZnO + 2HCN ----> Zn(CN)2 + H2O

10) isoelectronic species are those which have same number of electrons. One Negative charge increases electron by 1 and 1 positive charge decreases electrons by 1.

Ca2+ - 18e

Al3+ - 10e

Sr2+ - 36e

Na+ - 10e

O2- - 10e

K+ - 18e

Mg2+ - 10e

S2- - 18e

Cl- - 18e

N-3 - 10e

Ar - 18e

F- - 10e

Ne - 10e

P3- - 18e

So, one group is of 10e and other one is for 18e

8)

4 Nb + 10 HNO3 ----> 4 Nb(NO3)2 + N2O + 5 H2O

9)

6KI + Ca3(AsO4)2 ----> 3CaI2 + 2K3(AsO4)