Chemistry Test

Question 1
4 / -0

Directions: The following question has four choices out of which ONLY ONE is correct.

The method usually employed for dispersion of a colloidal solution is

A
addition of electrolytes

B
diffusion through animal membrane

C
condensation

D
dialysis

Question 2
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A mixture contains 1 mol volatile liquid \(A_{\left(P_{A}^{0}\right.}=100 \mathrm{mm} \mathrm{Hg},\) and \(3 \mathrm{mol}\) volatile liquid \(\left(\mathrm{p}_{\mathrm{g}}^{0}=80 \mathrm{mm}\right) \cdot\) If solution behaves ideally, total vapour
pressure of the solution is approximately

A
85 mm Hg

B
86 mm Hg

C
90 mm Hg

D
92 mm Hg

Question 3
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How many unit cells are present in a cube shaped ideal crystal of NaCl of mass 1.00 g? [Atomic masses : Na = 23 u, Cl = 35.5 u]

A
5.14 *10²¹

B
2.57 * 10²¹

C
1.28 * 10²¹

D
1.71 *10²¹

Question 4
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The energies of activation for forward and reverse reactions of A2 + B2 → 2AB are 180 kJ mol-1 and 200 kJ mol^-1 respectively. The presence of a catalyst lowers the activation energy of both (forward and reverse) reactions by 100 kJ mol^-1. The enthalpy change of the reaction (A2 + B2 → 2AB) in the presence of catalyst will be (in kJ mol^-1)

A
280

B
-20

C
300

D
-120

Question 5
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The minimum amount of iron required to produce just sufficient hydrogen (by reaction with dil. HCl) to react completely with the oxygen obtained by heating 2.45 g KClO₃ is

A
2.52 g

B
3.36 g

C
3.00 g

D
2.50 g

Question 6
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For N₂(g) + 3H₂(g) ⇌ 2NH₃(g), H is equal to

A
ΔE + 2RT

B
ΔE - 2RT

C
ΔE + RT

D
ΔE - RT

Question 7
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In adsorption, rate of physisorption increases when

A
temperature is decreased

B
temperature is increased

C
pressure is decreased

D
None of these

Question 8
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The gases which diffuse at the same rate under the same temperature and pressure conditions are

A
CO and NO

B
NO₂ and CO₂

C
NH₃ and PH₃

D
NO and C₂H₆

Question 9
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Directions: In the following question, a statement of Assertion is given; followed by a corresponding statement of Reason just below it. Of the statement mark the correct answer as:

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true, but the reason is not the correct explanation of the assertion.

(c) If assertion is true statement, but reason is false.

(d) If both assertion and reason are false.

Assertion: Molar entropy of vaporisation of water is different from ethanol.

Reason: Water is more polar than ethanol.

A
(a)

B
(b)

C
(c)

D
(d)

Question 10
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In which of the following processes, maximum increase in entropy is observed?

A
Melting of ice

B
Sublimation of naphthalene

C
Condensation of water

D
Condensation of water

Submit Test

Chemistry Test ...

Question 1

addition of electrolytes

diffusion through animal membrane

condensation

dialysis

Question 2

85 mm Hg

86 mm Hg

90 mm Hg

92 mm Hg

Question 3

5.14 *1021

2.57 * 1021

1.28 * 1021

1.71 *1021

Question 4

280

-20

300

-120

Question 5

2.52 g

3.36 g

3.00 g

2.50 g

Question 6

ΔE + 2RT

ΔE - 2RT

ΔE + RT

ΔE - RT

Question 7

temperature is decreased

temperature is increased

pressure is decreased

None of these

Question 8

CO and NO

NO2 and CO2

NH3 and PH3

NO and C2H6

Question 9

(a)

(b)

(c)

(d)

Question 10

Melting of ice

Sublimation of naphthalene

Condensation of water

Condensation of water

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Question Analysis

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5.14 *10²¹

2.57 * 10²¹

1.28 * 10²¹

1.71 *10²¹

NO₂ and CO₂

NH₃ and PH₃

NO and C₂H₆