JEE MAIN - Chemistry (2020 - 4th September Evening Slot - No. 4)
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.
(a) and (b) only
(a) only
(b) only
(b) and (c) only
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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