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

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) 4th April Morning Shift
MCQ (Single Correct Answer)
+4
-1

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
3
JEE Main 2024 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1

Appearance of blood red colour, on treatment of the sodium fusion extract of an organic compound with $$\mathrm{FeSO}_4$$ in presence of concentrated $$\mathrm{H}_2 \mathrm{SO}_4$$ indicates the presence of element/s

A
Br
B
S
C
N and S
D
N
4
JEE Main 2023 (Online) 13th April Evening Shift
MCQ (Single Correct Answer)
+4
-1

In the wet tests for detection of various cations by precipitation, $$\mathrm{Ba}^{2+}$$ cations are detected by obtaining precipitate of

A
$$\mathrm{BaSO}_{4}$$
B
$$\mathrm{Ba}(\mathrm{OAc})_{2}$$
C
$$\mathrm{BaCO}_{3}$$
D
$$\mathrm{Ba}(\mathrm{ox})$$ : Barium oxalate
Questions Asked from MCQ (Single Correct Answer)
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