JEE Main 2024 (Online) 8th April Morning Shift | Salt Analysis Question 1 | Chemistry

1

JEE Main 2024 (Online) 8th April Morning Shift

MCQ (Single Correct Answer)

+4

-1

Match List I with List II

	LIST I (Name of the test)		LIST II (Reaction sequence involved) [M is metal]
A.	Borax bead test	I.	$$\mathrm{MCO}_3 \rightarrow \mathrm{MO} \xrightarrow[+\Delta]{\mathrm{Co}\left(\mathrm{NO}_3\right)_2} \mathrm{CoO} \cdot \mathrm{MO}$$
B.	Charcoal cavity test	II.	$$\mathrm{MCO}_3 \rightarrow \mathrm{MCl}_2 \rightarrow \mathrm{M}^{2+}$$
C.	Cobalt nitrate test	III.	$$\mathrm{MSO}_4 \xrightarrow[\Delta]{\mathrm{Na}_2 \mathrm{~B}_4 \mathrm{O}_7} \mathrm{M}\left(\mathrm{BO}_2\right)_2 \rightarrow \mathrm{MBO}_2 \rightarrow \mathrm{M}$$
D.	Flame test	IV.	$$\mathrm{MSO}_4 \xrightarrow[\Delta]{\mathrm{Na}_2 \mathrm{CO}_3} \mathrm{MCO}_3 \rightarrow \mathrm{MO} \rightarrow \mathrm{M}$$

Choose the correct answer from the options given below:

A

A-III, B-I, C-IV, D-II

B

A-III, B-IV, C-I, D-II

C

A-III, B-II, C-IV, D-I

D

A-III, B-I, C-II, D-IV

2

JEE Main 2024 (Online) 6th April Evening Shift

MCQ (Single Correct Answer)

+4

-1

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

$$\mathrm{Br}^{-}$$

3

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

4

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