Match List-I with List-II:

Question

cdquestions Admin · Accepted Answer

The provided matching and explanations are correct. Here's a summary:

List I - Reagents and List II - Chemical Composition/Use:

(A) Tollen's Reagent: (III) Ammonical silver nitrate
- Tollen's Reagent is an ammoniacal solution of silver nitrate (AgNO₃).
- It's used to detect aldehydes, which are oxidized to carboxylic acids, while Ag⁺ is reduced to metallic silver (silver mirror).
(B) Jones Reagent: (IV) Chromium tetroxide sulphuric acid
- Jones Reagent is a solution of chromium trioxide (CrO₃) in sulfuric acid (H₂SO₄).
- It's a strong oxidizing agent used to oxidize primary alcohols to carboxylic acids and secondary alcohols to ketones.
(C) Lucas reagent: (II) conc HCl and ZnCl₂
- Lucas reagent is a solution of anhydrous zinc chloride (ZnCl₂) in concentrated hydrochloric acid (HCl).
- It's used to distinguish between primary, secondary, and tertiary alcohols based on their reactivity with HCl.
(D) Fehling Solution: (I) Rochelle salt
- Fehling Solution contains copper(II) sulfate (CuSO₄) and Rochelle salt (potassium sodium tartrate).
- It's used to detect aldehydes, which reduce Cu²⁺ to Cu₂O (red precipitate).

Therefore, the correct matching is:

This is indeed the correct answer and explanation.

Answer

(A) Tollen's reagent: Ammoniacal silver nitrate

Answer

(B) Jones reagent: CrO3-Sulphuric acid

Answer

(C) Lucas reagent: HCl + ZnCl2

Answer

(D) Fehling solution: Rochelle salt

List-I (Sentence)	List-II (Idiom)
(A) The officer tried to ______ his ideas with his superior by constantly praising.	(I) put your nose to the grindstone
(B) She realised that she was in the wrong and promised to ______.	(II) read between the lines
(C) You will do well at academics if you ______.	(III) turn over a new leaf
(D) A cryptic writing-style forces you to ______ the true meaning of the piece.	(IV) curry favours

The Correct Option is A