d and f Block Elements · Chemistry · AIIMS

Which element can have oxidation state from 4 to 6?

Which give coloured carbonate precipitate?

Assertion : Out of $$\mathrm{CrO}_3$$ and $$\mathrm{Al}_2 \mathrm{O}_3, \mathrm{CrO}_3$$ having lower melting point than $$\mathrm{Al}_2 \mathrm{O}_3$...

Assertion : $$\mathrm{S}_2 \mathrm{O}_7^{2-}$$ and $$\mathrm{Cr}_2 \mathrm{O}_7^{2-}$$ both exist. Reason : Both have same valence electrons....

Assertion : $$\mathrm{Yb}^{2+}$$ is more stable in compare to $$\mathrm{Gd}^{+2}$$. Reason : The electronic configuration of GD is $$[\mathrm{Xe}] 4 f...

Assertion : $$d^5$$ configuration is more stable than $$d^4$$. Reason : $$d^5$$ has more exchange energy as compared to $$d^4$$ because 10 and 6 excha...