1
JEE Main 2022 (Online) 26th July Evening Shift
+4
-1

Given below are two statements: one is labelled as Assertion $$\mathbf{A}$$ and the other is labelled as Reason $$\mathbf{R}$$.

Assertion A: Phenolphthalein is a $$\mathrm{pH}$$ dependent indicator, remains colourless in acidic solution and gives pink colour in basic medium.

Reason R: Phenolphthalein is a weak acid. It doesn't dissociate in basic medium.

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

A
Both $$\mathbf{A}$$ and $$\mathbf{R}$$ are true and $$\mathbf{R}$$ is the correct explanation of $$\mathbf{A}$$.
B
Both $$\mathbf{A}$$ and $$\mathbf{R}$$ are true but $$\mathbf{R}$$ is NOT the correct explanation of $$\mathbf{A}$$.
C
A is true but R is false.
D
A is false but R is true.
2
JEE Main 2022 (Online) 26th July Morning Shift
+4
-1

Which technique among the following, is most appropriate in separation of a mixture of $$100 \,\mathrm{mg}$$ of $$p$$-nitrophenol and picric acid ?

A
Steam distillation
B
2-5 ft long column of silica gel
C
Sublimation
D
Preparative TLC (Thin Layer Chromatography)
3
JEE Main 2022 (Online) 25th July Evening Shift
+4
-1

In base vs. acid titration, at the end point methyl orange is present as

A
quinonoid form
B
heterocyclic form
C
phenolic form
D
benzenoid form
4
JEE Main 2022 (Online) 25th July Morning Shift
+4
-1

Match List I with List II

List I List II
(A) N$$_2$$(g) + 3H$$_2$$(g) $$\to$$ 2NH$$_3$$(g) (I) Cu
(B) CO(g) + 3H$$_3$$(g) $$\to$$ CH$$_4$$(g) + H$$_2$$O(g) (II) Cu/ZnO $$-$$ Cr$$_2$$O$$_3$$
(C) CO(g) + H$$_2$$(g) $$\to$$ HCHO(g) (III) Fe$$_x$$O$$_y$$ + K$$_2$$O + Al$$_2$$O$$_3$$
(D) CO(g) + 2H$$_2$$(g) $$\to$$ CH$$_3$$OH(g) (IV) Ni

Choose the correct answer from the options given below :

A
$$(\mathrm{A})-(\mathrm{II}),(\mathrm{B})-(\mathrm{IV}),(\mathrm{C})-(\mathrm{I}),(\mathrm{D})-(\mathrm{III})$$
B
$$(\mathrm{A})-(\mathrm{II}),(\mathrm{B})-(\mathrm{I}),(\mathrm{C})-(\mathrm{IV}),(\mathrm{D})-(\mathrm{III})$$
C
$$(\mathrm{~A})-(\mathrm{III}),(\mathrm{B})-(\mathrm{IV}),(\mathrm{C})-(\mathrm{I}),(\mathrm{D})-(\mathrm{II})$$
D
$$(\mathrm{A})-(\mathrm{III}),(\mathrm{B})-(\mathrm{I}),(\mathrm{C})-(\mathrm{IV}),(\mathrm{D})-(\mathrm{II})$$
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