1
JEE Main 2021 (Online) 26th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Which pair of oxides is acidic in nature?
A
CaO, SiO2
B
B2O3, CaO
C
B2O3, SiO2
D
N2O, BaO
2
JEE Main 2021 (Online) 26th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
The correct order of electron gain enthalpy is :
A
Te > Se > S > O
B
S > Se > Te > O
C
S > O > Se > Te
D
O > S > Se > Te
3
JEE Main 2021 (Online) 26th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Match List - I with List - II.

List I
Electronic configuration
List II
$${\Delta _i}H$$ in kJ $$mo{l^{ - 1}}$$
(a) $$1{s^2}2{s^2}$$ (i) 801
(b) $$1{s^2}2{s^2}2{p^4}$$ (ii) 899
(c) $$1{s^2}2{s^2}2{p^3}$$ (iii) 1314
(d) $$1{s^2}2{s^2}2{p^1}$$ (iv) 1402

Choose the most appropriate answer from the options given below :
A
(a) $$ \to $$ (i), (b) $$ \to $$ (iii), (c) $$ \to $$ (iv), (d) $$ \to $$ (iii)
B
(a) $$ \to $$ (iv), (b) $$ \to $$ (i), (c) $$ \to $$ (ii), (d) $$ \to $$ (iii)
C
(a) $$ \to $$ (ii), (b) $$ \to $$ (iii), (c) $$ \to $$ (iv), (d) $$ \to $$ (i)
D
(a) $$ \to $$ (i), (b) $$ \to $$ (iv), (c) $$ \to $$ (iii), (d) $$ \to $$ (ii)
4
JEE Main 2021 (Online) 25th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
The correct order of bond dissociation enthalpy of halogens is :
A
F2 > Cl2 > Br2 > I2
B
Cl2 > Br2 > F2 > I2
C
I2 > Br2 > Cl2 > F2
D
Cl2 > F2 > Br2 > I2
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