1
JEE Main 2021 (Online) 26th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
For the given reaction

JEE Main 2021 (Online) 26th February Morning Shift Chemistry - Haloalkanes and Haloarenes Question 85 English
What is 'A'?
A
JEE Main 2021 (Online) 26th February Morning Shift Chemistry - Haloalkanes and Haloarenes Question 85 English Option 1
B
JEE Main 2021 (Online) 26th February Morning Shift Chemistry - Haloalkanes and Haloarenes Question 85 English Option 2
C
JEE Main 2021 (Online) 26th February Morning Shift Chemistry - Haloalkanes and Haloarenes Question 85 English Option 3
D
JEE Main 2021 (Online) 26th February Morning Shift Chemistry - Haloalkanes and Haloarenes Question 85 English Option 4
2
JEE Main 2021 (Online) 26th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following is 'a' FALSE statement ?
A
Carius method is used for the estimation of nitrogen in an organic compound.
B
Kjeldahl's method is used for the estimation of nitrogen in an organic compound.
C
Carius tube is used in the estimation of sulphur in an organic compound.
D
Phosphoric acid produced on oxidation of phosphorus present in an organic compound is precipitated as Mg2P2O7 by adding magnesia mixture.
3
JEE Main 2021 (Online) 26th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Find A, B and C in the following reactions :

$$N{H_3} + A + C{O_2} \to {(N{H_4})_2}C{O_3}$$

$${(N{H_4})_2}C{O_3} + {H_2}O + B \to N{H_4}HC{O_3}$$

$$N{H_4}HC{O_3} + NaCl \to N{H_4}Cl + C$$
A
$$A - {O_2};B - C{O_2};C - N{a_2}C{O_3}$$
B
$$A - {H_2}O;B - {O_2};C - NaHC{O_3}$$
C
$$A - {H_2}O;B - {O_2};C - N{a_2}C{O_3}$$
D
$$A - {H_2}O;B - C{O_2};C - NaHC{O_3}$$
4
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)
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