JEE Main 2023 (Online) 24th January Morning Shift | s-Block Elements Question 36 | Chemistry

	List-I		List-II
A.	Chlorophyll	I.	$$\mathrm{Na_2CO_3}$$
B.	Soda ash	II.	$$\mathrm{CaSO_4}$$
C.	Dentistry, Ornamental work	III.	$$\mathrm{Mg^{2+}}$$
D.	Used in white washing	IV.	$$\mathrm{Ca(OH)_2}$$

Choose the correct answer from the options given below :

A-III, B-I, C-II, D-IV

A-II, B-III, C-IV, D-I

A-II, B-I, C-III, D-IV

A-III, B-IV, C-I, D-II

JEE Main 2023 (Online) 24th January Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Reaction of BeO with ammonia and hydrogen fluoride gives A which on thermal decomposition gives $$\mathrm{BeF_2}$$ and $$\mathrm{NH_4F}$$. What is 'A'?

$$\mathrm{(NH_4)Be_2F_5}$$

$$\mathrm{(NH_4)_2BeF_4}$$

$$\mathrm{(NH_4)BeF_3}$$

$$\mathrm{H_3NBeF_3}$$

JEE Main 2022 (Online) 29th July Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Portland cement contains 'X' to enhance the setting time. What is 'X'?

$$\mathrm{CaSO}_{4} \cdot \frac{1}{2} \mathrm{H}_{2} \mathrm{O}$$

$$\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}$$

$$\mathrm{CaSO}_{4}$$