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

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

What is “18:8 stainless steel”?

What is Self-Electronation?

Name an ore having two different metal ions

Gelatin is general added to ice-creams. Why?

Generic 2

3 x 2 = 6

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?

The half life period of two samples are 0.1 and 0.4 seconds. Their initial concentrations are 200 and 50 mol L^-1 respectively. What is the order of reaction?

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Answers Key:

1 Marks

4 x 1 = 4

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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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The complete removal of one or more electrons from a molecular entity.

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Copper pyrites, CuFeS2, is the most important ore of copper. Thus, it has both Cu and Fe metal.
Thus, iron and copper both can be extracted from copper pyrites.

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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

3 x 2 = 6

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.

When the initial conc. become ¼, half life becomes 4 times. Order of reaction is 2.