This chapter is currently out of syllabus
1
JEE Main 2023 (Online) 24th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Match List I with List II

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
A-III, B-I, C-II, D-IV
B
A-II, B-III, C-IV, D-I
C
A-II, B-I, C-III, D-IV
D
A-III, B-IV, C-I, D-II
2
JEE Main 2023 (Online) 24th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

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'?

A
$$\mathrm{(NH_4)Be_2F_5}$$
B
$$\mathrm{(NH_4)_2BeF_4}$$
C
$$\mathrm{(NH_4)BeF_3}$$
D
$$\mathrm{H_3NBeF_3}$$
3
JEE Main 2022 (Online) 29th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

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

A
$$\mathrm{CaSO}_{4} \cdot \frac{1}{2} \mathrm{H}_{2} \mathrm{O}$$
B
$$\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}$$
C
$$\mathrm{CaSO}_{4}$$
D
$$\mathrm{CaCO}_{3}$$
4
JEE Main 2022 (Online) 29th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Lithium nitrate and sodium nitrate, when heated separately, respectively, give :

A
$$\mathrm{LiNO}_{2}$$ and $$\mathrm{NaNO}_{2}$$
B
$$\mathrm{Li}_{2} \mathrm{O}$$ and $$\mathrm{Na}_{2} \mathrm{O}$$
C
$$\mathrm{Li}_{2} \mathrm{O}$$ and $$\mathrm{NaNO}_{2}$$
D
$$\mathrm{LiNO}_{2}$$ and $$\mathrm{Na}_{2} \mathrm{O}$$
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