JEE Mains · Chemistry · STD 12 - 4. d and f- block elements
Identify correct statements from below: \(A\). The chromate ion is square planar. \(B\). Dichromates are generally prepared from chromates. \(C\). The green manganate ion is diamagnetic. \(D\). Dark green coloured \(\mathrm{K}_2 \mathrm{MnO}_4\) disproportionates in a neutral or acidic medium to give permanganate. \(E\). With increasing oxidation number of transition metal, ionic character of the oxides decreases. Choose the correct answer from the options given below:
- A \(B, C, D\) only
- B \(A, D, E\) only
- C \(A, B, C\) only
- D \(B, D, E\) only
Answer & Solution
Correct Answer
(D) \(B, D, E\) only
Step-by-step Solution
Detailed explanation
\(A\). \(\mathrm{CrO}_4{ }^{2-}\) is tetrahedral \(B\). \(2 \mathrm{Na}_2 \mathrm{CrO}_4+2 \mathrm{H}^{+} \rightarrow \mathrm{Na}_2 \mathrm{Cr}_2 \mathrm{O}_{/}+2 \mathrm{Na}^{+}+\mathrm{H}_2 \mathrm{O}\) \(C\). As per \(NCERT\), green manganate is paramagnetic with \(1\)…
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