Exams › JEE Advanced › Chemistry

Among the statements (a)-(c), which is/are INCORRECT? (a) W(VI) is more stable than Cr(VI). (b) In the presence of HCl, permanganate titrations give satisfactory results. (c) Some lanthanoid oxides can be used as phosphors.

1. (a) and (b) only
2. (a) only
3. (b) and (c) only
4. (b) only

Correct answer: (b) only

Solution

Statement (a) is correct (higher oxidation states are more stable down a group, so W(VI) > Cr(VI) stability) and (c) is correct, but (b) is wrong because HCl is oxidised by MnO4-, giving misleading results.

Related JEE Advanced Chemistry questions

• The count of d-electrons in Fe2+ differs from the number of:
• Which sequence of reactions accurately depicts the chemical processes involving iron and its associated compounds?
• When H2S interacts with an acidic solution of K2Cr2O7, which of the following compounds is not produced?
• When an excess amount of sodium thiosulfate is combined with copper sulfate in water, the resulting product is:
• Among the given lanthanoid ions, which one exhibits diamagnetic behavior? (Atomic numbers: Ce = 58, Sm = 62, Eu = 63, Yb = 70)
• Which of these statements is accurate?

⚔️ Practice JEE Advanced Chemistry free + battle 1v1 →