JEE Main 2020 (Online) 6th September Morning Slot | d and f Block Elements Question 51 | Chemistry

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JEE Main 2020 (Online) 6th September Morning Slot

MCQ (Single Correct Answer)

-1

The lanthanoid that does NOT show +4 oxidation state is :

JEE Main 2020 (Online) 6th September Morning Slot

MCQ (Single Correct Answer)

-1

The set that contains atomic numbers of only transition elements, is :

21, 32, 53, 64

9, 17, 34, 38

37, 42, 50, 64

21, 25, 42, 72

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

JEE Main 2020 (Online) 8th January Morning Slot

MCQ (Single Correct Answer)

-1

When gypsum is heated to 393 K, it forms :

CaSO₄ . 0.5H₂O

CaSO₄ . 5H₂O

Dead burnt plaster

Anhydrous CaSO₄

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