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

અભિકલ્પન A: સામાન્ય રીતે, 3d સંક્રમણ ધાતુઓના ઉત્કલન બિંદુ ઊંચા હોય છે.
કારણ R: 4s-ઇલેક્ટ્રોન ઉપરાંત 3d-ઇલેક્ટ્રોનની આંતર-આણ્વિક ધાતુય બંધનમાં ભાગીદારી.

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Generally, 3d transition metals have high melting points. Reason R : Involvement of 3d-electrons in addition to 4s-electrons in the interatomic metallic bonding. In the light of the above statements, choose the most appropriate answer from the options given below.

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