List of top Chemistry Questions on General Properties of the Transition Elements (d-Block)

Read the following passage and answer the next five questions based on it.
The transition metals are very hard and have low volatility. Their melting and boiling points are high. In any row, the melting points of these metals rise to a maximum at d5 and fall regularly as atomic number increases. The high melting points of these metals are attributed to the involvement of greater number of electrons from (n– 1)d in addition to ns electrons in the interatomic metallic bonding.

Increasing order of oxidation states of transition metal oxides will be
(A) $TiO_2$
(B) $MnO_4^{-}$
(C) $VO_2^{+}$
(D) $CrO_4 ^{2-}$
(E) $Ni (CO)4$
Choose the correct answer from the options given below:

Which is the correct thermal stability order for\( H_2E\) (E=O, S, Se, Te and Po)?