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CBSE 12th Standard Chemistry Subject Ncert Exemplar 1 Mark Questions With Solution 2021

Published on: 24/05/2021

QB365 Provides the updated NCERT Exemplar Questions for Class 12, and also provide the detail solution for each and every NCERT Exemplar questions. NCERT Exemplar questions are latest updated question pattern from NCERT, QB365 will helps 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

Questions + Answers key

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Std: 12th Standard CBSE - Chemistry

chapter: - NCERT Exemplers

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Questions:

1 Marks

7 x 1 = 7

Write two difference between sols and emulsions.

What are \(\triangle G,\ \triangle H\ and\ \triangle S\) for adsorption of gas on solid adsorbent?

Why is nitric oxide paramagnetic in gaseous state but the solid obtained on cooling it is diamagnetic?

What types of ores are roasted?

What other element may be added to silicon to make electrons available for conduction of an electric current?

In a crystal of zinc sulphide, zinc occupies tetrahedral voids. What is the coordination number of zinc?

What is the mode of action of antimicrobial drugs?

Generic 2

4 x 2 = 8

Structures of glycine and alanine are given below. Show the peptide linkage in glycylalanine.

Molecularity of any reaction not be equal to zero?

10.

What is a primary cell? Give an example.

11.

Give one most important application of the phenomenon of depression in freezing point in everyday life.

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Answers Key:

1 Marks

7 x 1 = 7

()
(i) Sols are dispersions of solids in liquids while emulsions are dispersions of liquids in liquids.
(ii) Sols are quite stable where as emulsions are less stable.

()
\(\triangle G=-ve,\ \triangle S=-ve,\ and\ \triangle H=-ve.\)

Nitric oxide (NO) is an odd electron molecule. It has 15 electrons (7 + 8), i.e., it has one unpaired electron and hence it is paramagnetic in the gaseous state. On cooling, it first becomes a liquid and then solid. In both these states, it exists as a dimer and hence is diamagnetic in both these states.

()
The process of extracting the metal by heating the metal oxide with a suitable reducing agent is called pyrometallurgy.

()
Phosphorus.

()
4

()
Antimicrobial drugs kill the microorganisms such as bacteria, virus, fungi or other parasites. They can alternatively inhibit the growth of pathogenic action of microbes.

Generic 2

4 x 2 = 8

Molecularity of the reaction is the number of molecules taking part in an elementary step. For this we require at least a single molecule leading to the value of minimum molecularity of one. Hence, molecularity of any reaction can never be equal to zero.

10.

A primary cell is the cell which the redox reaction occurs only once and the cell becomes dead after some time. It cannot used again.

11.

In lowering the freezing point of water in the car radiator by adding suitable solutes (ethylene glycol) to run it in sub - zero weather.