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1
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.
2
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
$$A - {H_2}O;B - C{O_2};C - NaHC{O_3}$$
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) 26th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Given below are two statements :

Statement I : A mixture of chloroform and aniline can be separated by simple distillation.

Statement II : When separating aniline from a mixture of aniline and water by steam distillation aniline boils below its boiling point.

In the light of the above statements, choose the most appropriate answer from the options given below :
A
Both Statement I and Statement II are true
B
Both Statement I and Statement II are false
C
Statement I is true but Statement II is false
D
Statement I is false but Statement II is true

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