MHT CET · Chemistry · p Block Elements (Group 15, 16, 17 & 18)
Which element from following combines with hydrogen to form a compound with lowest thermal stability?
- A F
- B Cl
- C I
- D Br
Answer & Solution
Correct Answer
(C) I
Step-by-step Solution
Detailed explanation
The bond dissociation enthalpy of \(\mathrm{H}-\mathrm{X}\) bond decreases in the order: \(\mathrm{HF} \gt \mathrm{HCl} \gt \mathrm{HBr} \gt \mathrm{HI}\). Therefore, thermal stability of hydrogen halides also decreases in the order:
\(\mathrm{HF} \gt \mathrm{HCl} \gt \mathrm{HBr} \gt \mathrm{HI}\)
\(\therefore \quad\) Iodine combines with H to form a compound with lowest thermal stability.
\(\mathrm{HF} \gt \mathrm{HCl} \gt \mathrm{HBr} \gt \mathrm{HI}\)
\(\therefore \quad\) Iodine combines with H to form a compound with lowest thermal stability.
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