JEE Main 2020 — D And F Block Elements Question with Solution
From: JEE Main 2020 (Online) 4th September Evening Slot
Question
The incorrect statement(s) among (a) - (c) is
(are)
(a) W(VI) is more stable than Cr(VI).
(b) In the presence of HCl, permanganate titrations provide satisfactory results.
(c) Some lanthanoid oxides can be used as phosphors.
(a) W(VI) is more stable than Cr(VI).
(b) In the presence of HCl, permanganate titrations provide satisfactory results.
(c) Some lanthanoid oxides can be used as phosphors.
Choose an option
Show full solutionCorrect option: C
Correct answer
C(b) only
Step-by-step explanation
W(VI) is more stable than Cr(VI)
Permanganate titrations in presence of HCl are unsatisfactory as HCl is oxidised to Cl2
Lanthanoid oxides are used as phosphors.
Permanganate titrations in presence of HCl are unsatisfactory as HCl is oxidised to Cl2
Lanthanoid oxides are used as phosphors.
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