The element that usually does NOT show variable oxidation states is :

Which compound (s) out of the following is/are not aromatic ?

Among the following compounds, which one is found in RNA ?

For the chemical reaction X $$\rightleftharpoons$$ Y, the standard reaction Gibbs energy depends on temperature T (in K) as $$\Delta $$_rG^o (in kJ mol^–1) = 120 $$ - {3 \over 8}$$ T.

The major component of the reaction mixture at T is :