Q47 · CSIR-NET Chemistry, December 2017
Paper: CSIR-NET December 2017 · Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Elements – General · Marks: 2 · Difficulty: Easy
Choose the incorrect statement for the phosphomolybdate anion $\left[\mathrm{PMo_{12}O_{40}}\right]^{3-}$
(a)It has a Keggin structure.
(b)Phosphorus is in +5 oxidation state.
(c)It is extremely basic.
(d)It forms crystalline precipitates with $\left[\mathrm{R}_{4} \mathrm{N}\right]^{+}$( $\mathrm{R}=$ bulky alkyl or aryl group)
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
Keggin-type phosphomolybdate is a very weak base / strong acid (H₃PMo₁₂O₄₀ is a heteropolyacid); the other statements are true.
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