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Board & Competitive Exams (Level-1) 32. F-centres in an ionic

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$Board \& Competitive Exams (Level-1) 32. F-centres in an ionic crystal$

Board \& Competitive Exams (Level-1) 32. F-centres in an ionic crystals are

Lattice sites containing electrons
Interstitial sites containing electrons
Lattice sites that are vacant
Interstitial sites containing cations

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Practice more questions on Solid State

Question 1

Medium

There is formation of

H_{2} O_{2}

in the upper atmosphere

H_{2} O + O ⟶ 2 OH ⟶ H_{2} O_{2}

Δ H = 72 kJ mol^{- 1}; E_{a} = 77 kJ mol^{- 1}

E_{a}

for the bimolecular recombination of two

OH

radicals to form

H_{2} O

and

O

$149 kJ mol^{- 1}$
$- 149 kJ mol^{- 1}$
$5 kJ mol^{- 1}$
$- 5 kJ mol^{- 1}$

Topic:

Chemical Kinetics

Book:

New Pattern JEE Problems Chemistry for JEE Main and Advance( Master Problem Package) (Arihant)

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Question 2

Medium

Select the correct statements(s).

Alkyl group is ortho and para directing
Rate of $S_{E}$ reaction of toluene is faster than that of benzene
In $S_{E}$ reaction of toluene, inductive effect wins over resonance
All of the above are correct statements

Topic:

Aldehydes, Ketones and Carboxylic Acids

Book:

New Pattern JEE Problems Chemistry for JEE Main and Advance( Master Problem Package) (Arihant)

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Question 3

Medium

Which concentration can be calculated if the mole fraction and density of an aqueous solution of

HCl

are known? I. Molality II. Molarity III. Per cent by mass

Only I
Only III
I and II only
I, II and III

Topic:

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Book:

New Pattern JEE Problems Chemistry for JEE Main and Advance( Master Problem Package) (Arihant)

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Question 4

Medium

How is leaching carried out in case of low grade copper ores?

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Book:

Chemistry Part-I (NCERT)

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Students who ask this question also asked

Question 1

What do you mean by cationic vacancies

Topic:

Solid State

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Question 2

A solid having density of

9 \times 1 0^{3} kg m^{- 3}

forms face centred cubic crystals of edge length

2002 pm

. What is the molar mass of the solid? [Avogadro constant

□ 6 \times 1 0^{23} mol^{- 1}, □□, 3

] A.

0.0432 kg mol^{- 1}

[Main Jan. 11, 2 B.

0.0216 kg mol^{- 1}

0.0305 kg mol^{- 1}

0.4320 kg mol^{- 1}

Topic:

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Question 3

1.8 g H_{2} O

में अणुओं की संख्या है(1)

6030 \times 1 0^{20}

Topic:

Solid State

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Question 4

An ionic solid

Na^{+} A^{-}

crystallises in a rock salt type structure.

2.592 g

of the ionic solid salt

Na^{+} A^{-}

is dissolved in water to make a 2 litre solution. The

pH

of this solution is 8 . If distance between cation and anion is

300 pm

. The density of the ionic solid (in

gm / cm^{3})

p K_{w} = 13, p K_{a} (HA) = 5, N_{A} = 6 \times 1 0^{23}

(Given: You could do better

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Question Text	Board \& Competitive Exams (Level-1) 32. F-centres in an ionic crystals are
Topic	Solid State
Subject	Chemistry
Class	Class 12

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