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CBSE 12th Standard Chemistry Subject HOT Questions 3 Mark Questions With Solution 2021

Published on: 28/05/2021

QB365 Provides the HOT Question Papers for Class 12 Chemistry, and also provide the detail solution for each and every HOT Questions. HOT Questions will help to get more idea about question pattern in every exams and also will help to get more marks in Exams

Download CBSE Class 12th Standard CBSE Chemistry question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Chemistry

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Std: 12th Standard CBSE - Chemistry

chapter: - HOT Questions

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Questions:

Generic 3

5 x 3 = 15

Crude copper containing Fe and Ag as contaminations was subjected to electro refining by using a current of 175 A for 6.434 min. The mass of anode was found to decrease by 22.260 g, while that of cathode was increased by 22.011 g. Estimate the % of copper, iron and silver in crude copper.

Give tha major products that are formed by heating each of following ethers with HI.
(i)

(ii)

(iii)

Hydrolysis of 2-bromo-3-methylbutane \(\left( 2° \right) \) gives only 2-methyl1-2-butanol \(\left( 3° \right) \).Explain.

Why is melting point of a substance used as criterion for testing the purity of a substance?

Identify compounds (A)-(B) in the following reactions:

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Answers Key:

Generic 3

5 x 3 = 15

% of Cu, Fe, Ag are 98.88, 0.831, 0.289 respectively.

(i)

(ii)

(iii)

During SNIreaction, the ionization gives 2° carbocation which rearranges by a hydride shift to a more stable 3"-carbocation to form 3°-alcohol as:

A pure compound has a sharp melting point. Impurities present, if any, lowers the melting point of the compound (similar to depression in freezing point).