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Question

KCl has higher melting point than AgCl. Why? 

[rAg+   rK+]



A

Cation size

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B

Anion size

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C

Pseudo noble gas cation

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D

Cation charge

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Solution

The correct option is B

Pseudo noble gas cation


Its given that cation sizes are nearly same, The cations are K+ and Ag+.

K+= [Ar] while Ag+ = [Kr]4d10

By looking at the e configurations, K+ has noble gas configuration and Ag+ has pseudo noble gas configuration beacuse of filled d-orbitals.

Such pseudo-noble gas configurations leads to more polarizing power beacuse of ineffective shielding of d-electrons.Thus Cl is more polarized in case of AgCl.

Thus,Agcl is more covalent than KCI and hence has lesser melting point


Chemistry

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