Which of these statements is not true ?
Show Hint
- \(\mathrm{NO^+}\) is not isoelectronic with \(\mathrm{O_2}\)
- B is always covalent in its compounds
- In aqueous solution, the \(\mathrm{Tl^+}\) ion is much more stable than Tl (III)
- \(\mathrm{LiAlH_4}\) is a versatile reducing agent in organic synthesis.
The Correct Option is A
Solution and Explanation
So \(\mathrm{NO^+}\) is isoelectronic with \(\mathrm{N_2}\), not with \(\mathrm{O_2}\); statement (1) as printed is actually a true statement.
(2) Boron has a very high ionisation enthalpy, so it forms covalent compounds only: true. (3) Because of the inert pair effect Tl(I) is more stable than Tl(III): true. (4) \(\mathrm{LiAlH_4}\) is a versatile reducing agent: true.
All four statements are chemically true as printed, so the question wording is flawed. The option the official key selects is (1) (the question evidently intended \(\mathrm{NO^+}\) to be 'isoelectronic with \(\mathrm{O_2}\)', which would be the false statement).
Answer: (1) \(\mathrm{NO^+}\) is not isoelectronic with \(\mathrm{O_2}\)
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