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Question

The element that forms stable compounds in low oxidation state is:


A
Mg
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B
Al
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C
Ga
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D
Tl
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Solution

The correct option is D $$Tl$$
The element that forms stable compounds in low oxidation state is $$Tl$$. The two electrons in the outer shell tend to remain paired and do not participate in compound formation (inert pair effect). 

Due to this, $$Tl(I)$$ compounds are more stable than $$Tl(III)$$ compounds. 

$$Tl(III)$$ ions act as oxidising agents and changes to $$Tl(I)$$ ions.

              $$ \displaystyle Tl^{3+}+2e^- \rightarrow Tl^+$$

Hence, option $$D$$ is correct.

Chemistry

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