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CBSE 12th Standard Chemistry Subject Ncert Exemplar 1 Mark Marks Questions 2021 Part - I

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

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Std: 12th Standard CBSE - Chemistry

chapter: - NCERT Exemplers

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Questions:

1 Marks

6 x 1 = 6

Draw the structure of CIF₃

How can we remove moisture from glass apparatus?

Adsorption of a gas on the surface of solid is generally accompained by decrease in entropy. Still it is a spontaneous process. Explain.

What is meant by point defect in crystals?

How is ferromagnetism different from paramagnetism?

What is the number of atoms in a unit cell of a simple cubic crystal?

Generic 2

4 x 2 = 8

A (C₃H₉N) reacts with benzenesulphonyl chloride to give a solid insoluble in alkali. Give the structure of A.

How is cell constant calculated from conductance values ?

What happens when blood cells are placed in pure water ?

10.

Define specific conductivity (specific conductance).

Fill up / 1 Marks

1 x 1 = 1

11.

If both adsorption and absorption take place simultaneously, the precess is called..................... .

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Answers Key:

1 Marks

6 x 1 = 6

()

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This can be done by placing anhydrous CaCl₂ in the apparatus which absorbs the moisture.

()
Adsorption is an exothermic process, i.e., energy factor favours the process. As \(\triangle G=\triangle H-T\triangle S,\) in adsorption, though \(\triangle S\) is-ve but \(\triangle H\) is also-ve and \(\triangle H>T\triangle S\) in magnitude so that is \(\triangle G\) -ve. Hence, the process is spontaneous.

()
The defect caused by missing or displacement of atoms or ions in a crystal is called point defect.

()
Ferromagnetism is the property due to which a substance remain magnetic field, e.g. Fe, Co,Ni shown ferromagnetism.
Paramagnetism is the property due to which a substance becomes of unpaired electrons, e.g.most of transition metals shown paramagnetism.

()
The number of atoms in a unit cell of a simple cubic crystal is one \(\left[ 8\times \frac { 1 }{ 8 } =1 \right] \).

Generic 2

4 x 2 = 8

Since A (C₃H₉N)₃H₉N) reacts with benzenesulphonyl chloride to give a solid insoluble in alkali, (A) must be a 2^o2^o amine ; i.e., CH₃-NH-CH₂CH₃ (ethylmethylamine).