Question

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

• A. They have large atomic sizes
• B. They have lower ionisation enthalpies
• C. They have variable oxidation state
• D. They form basic oxides

Answer 1

Answer: (C)

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, Cr can show valencies of $+2,+3,+4,+6$.