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CBSE 12th Standard Chemistry Subject HOT Questions 1 Mark Questions 2021 Part - I

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:

1 Marks

4 x 1 = 4

‘Reduction of a metal oxide is easier if the metal formed is in liquid state at the temperature of reduction. Why?

What is “18:8 stainless steel”?

Why artificial rain can be caused by throwing common salt on the clouds?

Gelatin is general added to ice-creams. Why?

Generic 2

2 x 2 = 4

The rate of reaction is given by K = P.Z.e^-Ea/RT. Name the factor which is to be decreased to bring an increase in the rate of reaction.

Higher molecularity reactions (viz. molecularity, 4 and above) are very rare. Why?

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Answers Key:

1 Marks

4 x 1 = 4

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The temperature of the substance in liquid state is higher. The Ellingham diagram suggests that the value of ΔG for the formation of metal oxides increases as the temperature increases. The reduction of metal oxide to metal is possible if the Gibbs energy is negative. Therefore, the reduction of metal oxide to metal is easier if the metal obtained in liquid state.

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18-8 Stainless Steel:
It is produced using approximate quantities of 18% chromium and 8% nickel, and it covers a family of fittings that include 302, 304, 305 and 384 stainless screws.
Screws made from 18-8 stainless steel are non-magnetic and have excellent resistance to rust and corrosion.

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Clouds are colloidal dispersion of water particles in air. The colloidal water particles carry charge. On throwing common salt on the clouds, coagulation of water particles takes place as common salt is an electrolyte.

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Ice cream is an emulsion of milk or cream in water, i.e., oil-in-water type. Gelatin is added to act as an emulsifier, i.e., it helps to stabilize the emulsion.

Generic 2

2 x 2 = 4

Energy of activation (Ea)

Molecules of reactants collide simultaneously and go to products. The probability of colliding 4 or 5 species simultaneously is very rare.