JEE Main 2020 (Online) 9th January Evening Slot | d and f Block Elements Question 53 | Chemistry

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

JEE Main 2019 (Online) 9th April Evening Slot

MCQ (Single Correct Answer)

-1

The maximum number of possible oxidation states of actinoides are shown by

nobelium (No) and lawrencium (Lr)

actinium (Ac) and thorium (Th)

neptunium (Np) and plutonium (Pu)

berkelium (Bk) and californium (Cf)

JEE Main 2019 (Online) 8th April Evening Slot

MCQ (Single Correct Answer)

-1

The statement that is INCORRECT about the interstitial compounds is :

They are chemically reactive

They have metallic conductivity

They have high melting points

They are very hard

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