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

During the detection of acidic radical present in a salt, a student gets a pale yellow precipitate soluble with difficulty in $$\mathrm{NH}_4 \mathrm{OH}$$ solution when sodium carbonate extract was first acidified with dil. $$\mathrm{HNO}_3$$ and then $$\mathrm{AgNO}_3$$ solution was added. This indicates presence of :

A
$$\mathrm{I}^{-}$$
B
$$\mathrm{CO}_3{ }^{2-}$$
C
$$\mathrm{Cl}^{-}$$
D
$$\mathrm{Br}^{-}$$
2
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
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) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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
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