KCET · Chemistry · d and f Block Elements
Which of the following will not act as an oxidising agent?
- A \(\text{CrO}_3\)
- B \(\text{MoO}_3\)
- C \(\text{CrO}_4^{2-}\)
- D \(\text{Cr}_2\text{O}_7^{2-}\)
Answer & Solution
Correct Answer
(B) \(\text{MoO}_3\)
Step-by-step Solution
Detailed explanation
In Group 6 elements (Cr, Mo, W), the stability of the higher oxidation state (+6) increases down the group.
Therefore, Mo(VI) and W(VI) are much more stable than Cr(VI).
Compounds of Cr(VI) such as \(\text{CrO}_3\), \(\text{CrO}_4^{2-}\), and \(\text{Cr}_2\text{O}_7^{2-}\) are strong oxidising agents because Cr(VI) can easily be reduced to the more stable Cr(III) state.
On the other hand, Mo(VI) in \(\text{MoO}_3\) is highly stable and does not undergo reduction easily. Thus, \(\text{MoO}_3\) does not act as an oxidising agent.
Answer: \(\text{MoO}_3\)
Therefore, Mo(VI) and W(VI) are much more stable than Cr(VI).
Compounds of Cr(VI) such as \(\text{CrO}_3\), \(\text{CrO}_4^{2-}\), and \(\text{Cr}_2\text{O}_7^{2-}\) are strong oxidising agents because Cr(VI) can easily be reduced to the more stable Cr(III) state.
On the other hand, Mo(VI) in \(\text{MoO}_3\) is highly stable and does not undergo reduction easily. Thus, \(\text{MoO}_3\) does not act as an oxidising agent.
Answer: \(\text{MoO}_3\)
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