1
JEE Main 2024 (Online) 30th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The Lassiagne's extract is boiled with dil $$\mathrm{HNO}_3$$ before testing for halogens because,

A
Silver halides are soluble in $$\mathrm{HNO}_3$$.
B
$$\mathrm{AgCN}$$ is soluble in $$\mathrm{HNO}_3$$.
C
$$\mathrm{Na}_2 \mathrm{S}$$ and $$\mathrm{NaCN}$$ are decomposed by $$\mathrm{HNO}_3$$.
D
$$\mathrm{Ag}_2 \mathrm{S}$$ is soluble in $$\mathrm{HNO}_3$$.
2
JEE Main 2024 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

On passing a gas, '$$\mathrm{X}$$', through Nessler's regent, a brown precipitate is obtained. The gas '$$\mathrm{X}$$' is

A
$$\mathrm{Cl}_2$$
B
$$\mathrm{CO}_2$$
C
$$\mathrm{NH}_3$$
D
$$\mathrm{H}_2 \mathrm{S}$$
3
JEE Main 2024 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Identify the incorrect pair from the following :

A
Fluoroapatite $$-3 \mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2 \cdot \mathrm{CaF}_2$$
B
Carnallite $$-\mathrm{KCl} \cdot \mathrm{MgCl}_2 \cdot 6 \mathrm{H}_2 \mathrm{O}$$
C
Cryolite $$-\mathrm{Na}_3 \mathrm{AlF}_6$$
D
Fluorspar $$-\mathrm{BF}_3$$
4
JEE Main 2024 (Online) 27th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Given below are two statements :

Statement (I) : Oxygen being the first member of group 16 exhibits only -2 oxidation state.

Statement (II) : Down the group 16 stability of +4 oxidation state decreases and +6 oxidation state increases.

In the light of the above statements, choose the most appropriate answer from the options given below :

A
Statement I is correct but Statement II is incorrect
B
Both Statement I and Statement II are incorrect
C
Statement I is incorrect but Statement II is correct
D
Both Statement I and Statement II are correct
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