1
MCQ (Single Correct Answer)

JEE Main 2017 (Online) 8th April Morning Slot

A solution containing a group-IV cation gives a precipitate on passing H2S. A solution of this precipitate in dil.HCl produces a white precipitate with NaOH solution and bluish-white precipitate with basic potassium ferrocyanide. The cation is :
A
Co2+
B
Ni2+
C
Mn2+
D
Zn2+
2
MCQ (Single Correct Answer)

JEE Main 2018 (Offline)

An alkali is titrated against an acid with methyl orange as indicator, which of the following is a correct combination?
A
Base Acid End point
Weak Strong Colourless to pink
B
Base Acid End point
Strong Strong Pinkish red to yellow
C
Base Acid End point
Weak Strong Yellow to pinkish red
D
Base Acid End point
Strong Strong Pink to colourless

Explanation

Methyl orange is a basic indicator. Its pH range is 8.3 $$-$$ 10.

In acidic solution when pH < 8.3 , methyl orange shows red or pinkish red color. In basic solution when pH > 10, methyl orange shows yellow color.

Here an alkali is titrated against an acid - it means in basic medium we gradually add strong acid.

As initially medium is basic so its pH is high (> 10) so methyl orange will show yellow color. When we gradually add strong acid then pH value will gradually decrease and pH become $$ \le $$ 7 at end point. So methyl orange will show pinkish red color.
3
MCQ (Single Correct Answer)

JEE Main 2018 (Online) 15th April Morning Slot

A white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the aformentioned solution, a white precipitate is obtained which does not dissolve in dil. nitric acid. The anion is :
A
CO32-
B
SO42-
C
Cl-
D
S2-
4
MCQ (Single Correct Answer)

JEE Main 2018 (Online) 15th April Morning Slot

The correct match between items of List-I and List-II is :

List - I List - II
(A) Coloured impurity (P) Steam distribution
(B) Mixture of o-nitrophenol
and p-nitrophenol
(Q) Fractional distribution
(C) Crude Naphtha (R) Charcoal treatment
(d) Mixture of glycerol
and sugars
(S) Distillation under
reduced pressure
A
(A)-(R), (B)-(S), (C)-(P), (D)-(Q)
B
(A)-(R), (B)-(P), (C)-(S), (D)-(Q)
C
(A)-(R), (B)-(P), (C)-(Q), (D)-(S)
D
(A)-(P), (B)-(S), (C)-(R), (D)-(Q)

Explanation

(a) Charcoal treatment removes coloured impurity through adsorption.

(b) Steam distillation separates the mixture of o-nitrophenol and p-nitrophenol. The o-nitrophenol is steam volatile (due to intramolecular hydrogen bonding), and the para isomer is not volatile.

(c) Fractional distillation separates crude naphtha. Naphtha is a flammable liquid hydrocarbon mixture.

(d) Distillation under reduced pressure separates mixture of glycerol and sugars. Vacuum distillation lowers the boiling point and prevents decomposition.

Questions Asked from Practical Organic Chemistry

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