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Question

The incorrect statement(s) among (a) - (c) is (are):

(a)WVI is more stable thanCrVI.

(b) In the presence of HCl, permanganate titrations provide satisfactory results.

(c) Some Lanthanoid oxides can be used as Phosphors.


A

(a) only

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B

(b) and (c) only

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C

(a) and (b) only

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D

(b) only

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Solution

The correct option is D

(b) only


The appropriate choices are: (d)

The explanation for the correct answers is:

(d)

(b) only

  • Explanation: In the vicinity of HCl, permanganate titrations produce good outcomes. Using potassium permanganate to titrate oxalates, which combines with to generate chlorine The result is HCl utilizes the KMnO4titrant.

The explanation for the incorrect options:

(a)

(a) only

  • Explanation: This idea is supported by the fact that as we move down the periodic table from top to bottom, the stability of elements with higher oxidation states will rise.
  • The fact that the longevity of elements with larger oxidation states will increase as we move from the top of the periodic table to the bottom supports this theory.

(b)

(b) and (c) only

  • Explanation: Oxalates are titrated using potassium permanganate, which combines withHCl to produce chlorine. As a result, HCl uses up the KMnO4titrant.

(c) Some lanthanoid oxides can be used as phosphors.

  • Explanation: Lanthanide oxides are helpful in luminous materials such as phosphors. A useful analytical oxidizing agent is ceramic sulfate. Lanthanide oxides are used in the glass, ceramic, electronics, chemical, and nuclear industries, both as natural-ratio mixed oxides and as high-purity compounds

(c)

(a) and (b) only

  • Explanation: The fact that the longevity of elements with larger oxidation states will increase as we move from the top of the periodic table to the bottom supports this theory. Lanthanide oxides are used in the glass, ceramic, electronics, chemical, and nuclear industries, both as natural-ratio mixed oxides and as high-purity compounds.

(b) In the presence ofHCl, permanganate titrations provide satisfactory results.

  • Explanation: Oxalates are titrated using potassium permanganate, which combines withHCl to produce chlorine. which combines with to generate chlorine The result utilizes the KMnO4titrant.

The final correct answer is (d): it will not give satisfactory results when it is titrated byHCl.


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