Question

Which of the following is most thermally stable?

• A. $H_{2}O$
• B. $H_{2}S$
• C. $H_{2}Se$
• D. $H_{2}Te$

Answer 1

Answer: (A)

$H_{2}O$

$H_{2}O$ is thermally stable than the other hydrides which were given, because the given hydrides are 6th group hydrides as we move down the group the thermal stability of hydrides decreases due to weak intermolecular hydrogen bonding.

Hence option $A$ is correct.