Which of the following is not true about s-block elements?

They have large atomic sizes

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They have lower ionisation enthalpies

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They have variable oxidation state

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They form basic oxides

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Solution

The correct option is C They have variable oxidation state
The $s -$ block elements have only one or two electrons in their valence shell so they can only show the oxidation state of +1 and +2 only. The d-block elements can show variable valency, For example, $C r$ can show valencies of +2, +3, +4, +6.

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Which of the following is not true about s-block elements?

The correct option is C They have variable oxidation stateThe s−block elements have only one or two electrons in their valence shell so they can only show the oxidation state of +1 and +2 only. The d-block elements can show variable valency, For example, Cr can show valencies of +2, +3, +4, +6.