JEE Main 2020 (Online) 4th September Evening Slot | d and f Block Elements Question 138 | Chemistry

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) and (b) only

(a) only

(b) only

(b) and (c) only

JEE Main 2020 (Online) 4th September Morning Slot

MCQ (Single Correct Answer)

-1

The elements with atomic numbers 101 and 104 belong to, respectively :

Group 6 and Actinoids

Actinoids and Group 4

Group 11 and Group 4

Actinoids and Group 6

JEE Main 2020 (Online) 3rd September Evening Slot

MCQ (Single Correct Answer)

-1

The incorrect statement is :

In manganate and permanganate ions, the p-bonding takes place by overlap of p-orbitals of oxygen and d-orbitals of manganese

Manganate ion is green in colour and permanganate ion in purple in colour

Manganate and permanganate ions are paramagnetic

Manganate and permanganate ions are tetrahedral

JEE Main 2020 (Online) 9th January Evening Slot

MCQ (Single Correct Answer)

-1

5 g of zinc is treated separately with an excess of

(a) dilute hydrochloric acid and
(b) aqueous sodium hydroxide.

The ratio of the volumes of H₂ evolved in these two reactions is :

1 : 2

1 : 1

1 : 4

2 : 1

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