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Question

Which of the following does not have a pseudo noble gas configuration?


A
Zn2+
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B
Sn4+
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C
Al3+
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D
In3+
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Solution

The correct option is C Al3+
When a d block element loses its outermost s orbital electrons and in turn, the whole s sub shell, it is said to have a pseudo noble gas configuration. 
Zn2+=[Ar]3d10 4s loses all its electrons
Sn4+=[Kr]4d10 5s and 5p lose all their electrons
Al3+=[Ne]
In3+=[Kr]4d10 5s and 5p lose all their electrons 

So Al3+ has a regular noble gas configuration and is the answer here.

Chemistry

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