NEET Chemistry: Questions 476 - 482 of 891

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Question number: 476

» States of Matter » Solid State » Packing in Solids (Fcc, Bcc and Hcp Lattices)

MCQ▾

Question

The density of KCl is 1.9893g/cm3 and the length of a side of unit cell is 6.2908 A° as determined by X-ray diffraction. Calculate the value of Avogadro’s number?

Choices

Choice (4) Response

a.

6.027×1022

b.

6.027×1023

c.

6.017×1023

d.

6.017×1023

Question number: 477

» States of Matter » Solid State » Packing in Solids (Fcc, Bcc and Hcp Lattices)

MCQ▾

Question

How many elements of symmetry will be possessed by a cubic crystal?

Choices

Choice (4) Response

a.

34

b.

23

c.

16

d.

21

Question number: 478

» States of Matter » Solid State » Packing in Solids (Fcc, Bcc and Hcp Lattices)

MCQ▾

Question

The packing fraction of the element that crystallizes in simple cubic arrangement is?

Choices

Choice (4) Response

a.

π/6

b.

π/2

c.

π/3

d.

π/4

Question number: 479

» States of Matter » Solid State » Calculations Involving Unit Cell Parameters

MCQ▾

Question

An element ‘A’ has face centered cubic structure with edge length equal to 361 pm. The apparent radius of atom ‘A’ is?

Choices

Choice (4) Response

a.

160.5 pm

b.

180.2 pm

c.

127.6 pm

d.

64 pm

Question number: 480

» States of Matter » Solid State » Packing in Solids (Fcc, Bcc and Hcp Lattices)

MCQ▾

Question

How many init cells are present in 39 grams of potassium that crystallizes in body-centered cubic structure?

Choices

Choice (4) Response

a.

NA

b.

NA2

c.

0.75 NA

d.

0.5 NA

Question number: 481

» States of Matter » Solid State » Voids

MCQ▾

Question

Which of the following compound are used in memory units of computers?

Choices

Choice (4) Response

a.

Potassium bromide

b.

Ferrites

c.

Sodium oxides

d.

Zinc sulphides

Question number: 482

» States of Matter » Solid State » Classification of Solids

MCQ▾

Question

Which of the following statements is not true about ionic crystals?

Choices

Choice (4) Response

a.

These are good conductors in solid state

b.

These are quite hard in nature

c.

These are crystalline solids at room temperature

d.

Soluble in polar solvents

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