JEE Main 2020 (Online) 2nd September Evening Slot | s-Block Elements Question 87 | Chemistry

Two elements A and B have similar chemical properties. They don’t form solid hydrogencarbonates, but react with nitrogen to form nitrides. A and B, respectively, are :

Li and Mg

Cs and Ba

Na and Rb

Na and Ca

JEE Main 2020 (Online) 2nd September Morning Slot

MCQ (Single Correct Answer)

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Out of Syllabus

The metal mainly used in devising photoelectric cells is :

JEE Main 2020 (Online) 9th January Evening Slot

MCQ (Single Correct Answer)

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Out of Syllabus

Among the statements (a)-(d) the correct ones are :

(a) Lithium has the highest hydration enthalpy among the alkali metals.

(b) Lithium chloride is insoluble in pyridine.

(c) Lithium cannot form ethynide upon its reaction with ethyne.

(d) Both lithium and magnesium react slowly with H₂O.

(b) and (c) only

(a) and (d) only

(a), (b) and (d) only

(a), (c) and (d) only

JEE Main 2020 (Online) 8th January Morning Slot

MCQ (Single Correct Answer)

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Out of Syllabus

When gypsum is heated to 393 K, it forms :

CaSO₄ . 0.5H₂O

CaSO₄ . 5H₂O

Dead burnt plaster