AP EAMCET · Chemistry · d and f Block Elements
Arrange the oxides \(\mathrm{CrO}, \mathrm{CrO}_3\) and \(\mathrm{Cr}_2 \mathrm{O}_3\) in the decreasing order of acidic strength
- A \(\mathrm{CrO}_3>\mathrm{Cr}_2 \mathrm{O}_3>\mathrm{CrO}\)
- B \(\mathrm{CrO}_3>\mathrm{CrO}>\mathrm{Cr}_2 \mathrm{O}_3\)
- C \(\mathrm{CrO}>\mathrm{Cr}_2 \mathrm{O}_3>\mathrm{CrO}_3\)
- D \(\mathrm{CrO}>\mathrm{CrO}_3>\mathrm{Cr}_2 \mathrm{O}_3\)
Answer & Solution
Correct Answer
(A) \(\mathrm{CrO}_3>\mathrm{Cr}_2 \mathrm{O}_3>\mathrm{CrO}\)
Step-by-step Solution
Detailed explanation
\(\mathrm{Cr}\) in higher oxidation state will be more acidic. Thus, the order of acidic strength will be :- \(\stackrel{+6}{\mathrm{CrO}_3}>\stackrel{+3}{\mathrm{CrO}} \mathrm{O}_3>\stackrel{+2}{\mathrm{Cr} O}\)
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