NEET (NTA)-National Eligibility cum Entrance Test (Medical) Chemistry: Questions 521 - 527 of 1258

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Question number: 521

» States of Matter » Solid State » Ionic

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MCQ▾

Question

A particular solid is very hard and has a high melting point. In solid state it is a non conductor of electricity. Classify the solid?

Choices

Choice (4) Response

a.

Molecular

b.

Metallic

c.

Ionic

d.

Amorphous

Question number: 522

» States of Matter » Solid State » Bragg's Law and Its Applications

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MCQ▾

Question

X-rays of wavelength 1.54 A0 strike a crystal and are observed to be deflected at an angle of 22.5°. Assuming that n = 1, calculate the spacing between the planes of atoms that are responsible for this reflection?

Choices

Choice (4) Response

a.

3.1 A°

b.

4.2 A°

c.

2.01 A°

d.

3.71 A°

Question number: 523

» States of Matter » Solid State » Unit Cell and Lattices

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MCQ▾

Question

In the simple cubic structure, what will be the contribution of atoms per unit cell?

Choices

Choice (4) Response

a.

2

b.

3

c.

1

d.

4

Question number: 524

» States of Matter » Solid State » Ionic

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MCQ▾

Question

How many chloride ions are there around sodium ion in sodium chloride crystal?

Choices

Choice (4) Response

a.

6

b.

3

c.

4

d.

8

Question number: 525

» States of Matter » Solid State » Voids

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MCQ▾

Question

Which of the following crystal has the Antifluorite structure?

Choices

Choice (4) Response

a.

AgCl

b.

HgS

c.

AgI

d.

Na2O

Question number: 526

» Chemical Kinetics » Collision Theory of Bimolecular Gaseous Reactions

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MCQ▾

Question

According to Arrhenius theory, the rate is directly proportional to the number of effective collisions , here Z is?

Choices

Choice (4) Response

a.

Collision fraction

b.

Collision frequency

c.

Collision coefficient

d.

Question does not provide sufficient data or is vague

Question number: 527

» Chemical Kinetics » Differential and Integral Forms of Zero and First Order Reactions

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MCQ▾

Question

A substance reacts with initial concentration of a mol/dm3 according to zero order kinetics. The time it takes for the completion of the reaction is (k = rate constant)?

Choices

Choice (4) Response

a.

2k/a

b.

a/k

c.

a/2k

d.

k/a