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Objective Questions
GS
GS Set-1
Chemistry
Physical Chemistry
102

Physical Chemistry MCQ with Answers

102) The appearance of colour in solid alkali metal halides is generally due to:

Frenkel defect

Interstitial position

F−center

Schottky defect

Answer is:

F−center

Explanation:

When the electron takes the place of an anion in a crystal, then a non−stoichiometry arises. This extra electron is delocalised and when it absorbs light, it gets excited from ground state to higher energy state, and the crystal thus, appeared coloured. The site at which this extra electron is placed is called the F−center.

Physical Chemistry MCQ with Answers

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103) Which of the following compounds has an antifluorite structure?

K₂O

BaF₂

CuBr

TiI

Answer is:

K₂O

104) In a solid AB, having the NaCl structure, A atoms occupy the corners of the cubic unit cell. If all the face centered atoms along one of the axes are removed, then the resultant stoichiometry of the solid is:

AB₂

A₂B

A₄B₃

A₃B₄

Answer is:

A₃B₄

105) The yellow colour of ZnO and conducting nature produced upon heating is due to:

Metal excess defects due to interstitial cation

Extra positive ions present in an interstitial site

Trapped electrons

All of these

Answer is:

All of these

Explanation:

The yellow colour of ZnO and conducting nature produced upon heating is due to
* Metal excess defects due to interstitial cation
* Extra positive ions present in an interstitial site
* Trapped electrons

106) To 500 cc of water, 3 x 10⁻³ kg of acetic acid is added. If 23% of acetic acid is dissociated, what will be the depression in freezing point? K_f and density of water are 1.86 K⁄kg and 0.0997 gm⁄cc respectively.

0.186 K

0.228 K

0.371 K

0.555 K

Answer is:

0.228 K

Explanation:

ΔT_f = iK_fm

Physical Chemistry MCQ with Answers

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102) The appearance of colour in solid alkali metal halides is generally due to:

F−center

Physical Chemistry MCQ with Answers

Related Physical Chemistry MCQ with Answers

103) Which of the following compounds has an antifluorite structure?

K2O

104) In a solid AB, having the NaCl structure, A atoms occupy the corners of the cubic unit cell. If all the face centered atoms along one of the axes are removed, then the resultant stoichiometry of the solid is:

A3B4

105) The yellow colour of ZnO and conducting nature produced upon heating is due to:

All of these

106) To 500 cc of water, 3 x 10−3 kg of acetic acid is added. If 23% of acetic acid is dissociated, what will be the depression in freezing point? Kf and density of water are 1.86 K⁄kg and 0.0997 gm⁄cc respectively.

0.228 K

Physical Chemistry MCQ with Answers

K₂O

A₃B₄

106) To 500 cc of water, 3 x 10⁻³ kg of acetic acid is added. If 23% of acetic acid is dissociated, what will be the depression in freezing point? K_f and density of water are 1.86 K⁄kg and 0.0997 gm⁄cc respectively.