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1
JEE Main 2024 (Online) 6th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match List I with List II

LIST I
(Precipitating reagent and conditions)		 LIST II
(Cation)
A. $$
\mathrm{NH}_4 \mathrm{Cl}+\mathrm{NH}_4 \mathrm{OH}
$$		 I. $$\mathrm{Mn^{2+}}$$
B. $$
\mathrm{NH}_4 \mathrm{OH}+\mathrm{Na}_2 \mathrm{CO}_3
$$		 II. $$\mathrm{Pb^{2+}}$$
C. $$
\mathrm{NH}_4 \mathrm{OH}+\mathrm{NH}_4 \mathrm{Cl}+\mathrm{H}_2 \mathrm{~S} \text { gas }
$$		 III. $$\mathrm{Al^{3+}}$$
D. dilute $$\mathrm{HCl}$$ IV. $$\mathrm{Sr^{2+}}$$

Choose the correct answer from the options given below:

A
A-III, B-IV, C-I, D-II
B
A-III, B-IV, C-II, D-I
C
A-IV, B-III, C-II, D-I
D
A-IV, B-III, C-I, D-II
2
JEE Main 2024 (Online) 6th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which of the following statements are correct?

A. Glycerol is purified by vacuum distillation because it decomposes at its normal boiling point.

B. Aniline can be purified by steam distillation as aniline is miscible in water.

C. Ethanol can be separated from ethanol water mixture by azeotropic distillation because it forms azeotrope.

D. An organic compound is pure, if mixed M.P. is remained same.

Choose the most appropriate answer from the options given below :

A
A, C, D only
B
B, C, D only
C
A, B, D only
D
A, B, C only
3
JEE Main 2024 (Online) 4th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

In the precipitation of the iron group (III) in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide to :

A
decrease concentration of $${ }^{-} \mathrm{OH}$$ ions
B
increase concentration of $$\mathrm{Cl}^{-}$$ ions
C
prevent interference by phosphate ions
D
increase concentration of $$\mathrm{NH}_4{ }^{+}$$ ions
4
JEE Main 2024 (Online) 1st February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
In Kjeldahl's method for estimation of nitrogen, $\mathrm{CuSO}_4$ acts as :
A
catalytic agent
B
hydrolysis agent
C
reducing agent
D
oxidising agent
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