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1
JEE Main 2023 (Online) 6th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Ion having highest hydration enthalpy among the given alkaline earth metal ions is :

A
$$\mathrm{Sr}^{2+}$$
B
$$\mathrm{Ca}^{2+}$$
C
$$\mathrm{Be}^{2+}$$
D
$$\mathrm{Ba}^{2+}$$
2
JEE Main 2023 (Online) 6th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Structures of $$\mathrm{BeCl}_{2}$$ in solid state, vapour phase and at very high temperature respectively are :

A
Polymeric, Dimeric, Monomeric
B
Dimeric, Polymeric, Monomeric
C
Polymeric, Monomeric, Dimeric
D
Monomeric, Dimeric, Polymeric
3
JEE Main 2023 (Online) 1st February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Gypsum is used for making fireproof wall boards.

Reason (R) : Gypsum is unstable at high temperatures.

In the light of the above statements, choose the correct answer from the options given below :

A
Both (A) and (R) are correct but (R) is not the correct explanation of (A)
B
Both (A) and (R) are correct and (R) is the correct explanation of (A)
C
(A) is correct but (R) is not correct
D
(A) is not correct but (R) is correct
4
JEE Main 2023 (Online) 1st February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Match List I with List II :

List I List II
A. Slaked lime I. $$\mathrm{NaOH}$$
B. Dead burnt plaster II. $$\mathrm{Ca(OH)_2}$$
C. Caustic soda III. $$\mathrm{Na_2CO_3\cdot 10H_2O}$$
D. Washing soda IV. $$\mathrm{CaSO_4}$$

Choose the correct answer from the options given below :

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