Chemistry Test 202

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Chemistry Test 202

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Weekly Quiz Competition

Question 1
4 / -1

When initial concentration of a reactant is doubled in a reaction its half-life period is not affected. The order of the reaction is

A
Second

B
more than zero but less than first

C
zero

D
first

Solution

Half-life period of a first order reaction is independent or initial concentration,
Question 2
4 / -1

What is the activation energy for a reaction if its rate doubles when the temperature is raised from 20°C to 35°C? (R = 8.314Imol⁻¹K⁻¹)

A
34.7kJmol⁻¹

B
15.1kJmol⁻¹

C
342kJmol⁻¹

D
296kJmol⁻¹

Solution
Question 3
4 / -1

In a zero-order reaction for every 10°C rise of temperature, the rate is doubled. If the temperature is increased from 10°C to 100°C, the rate of the reaction will become

A
256 times

B
512 times

C
64 times

D
128 times

Solution
Question 4
4 / -1

The unit of rate constant for a zero order reaction is

A
molL⁻¹s⁻¹

B
L⁻¹mols⁻¹

C
L²mol⁻²s⁻¹

D
s⁻¹

Solution

The units are molL⁻¹s⁻¹
Question 5
4 / -1

Which one of the following statements for the order of a reaction is incorrect?

A
Order can be determined only experimentally.

B
Order is not influenced by stoichiometric coefficient of the reactants.

C
Order of a reaction is sum of power to the concentration terms of reactants to express the rate of reaction.

D
Order of reaction is always whole number.

Solution

Order of a reaction is not always whole number. It can be zero, or fractional also.
Question 6
4 / -1

A 0.0020 m aqueous solution of an ionic compound [Co(NH₃)₅(NO₂)]Cl freezes at - 0.00732^oC. Number of moles of ions which 1 mol of ionic compound produces on being dissolved in water will be :

A
3

B
4

C
1

D
2

Solution

The number of moles of ions produced by 1 mole of ionic compound = i
Question 7
4 / -1

he boiling point of 0.2 mol kg^-1 solution of X in water is greater than an equimolal solution of Y in water. Which one of the following statements is true in this case?

A
X is undergoing dissociation in water.

B
Molecular mass of X is greater than the molecular mass of Y.

C
Molecular mass of X is less than the molecular mass of Y.

D
Y is undergoing dissociation in water while X undergoes no change

Solution

ΔTb = i K_b.m

K_b and mm are constant for solutions of X and Y. Greater ΔTb for solution X implies that ii (Van't Hoff factor) for X > 1 i.e., X undergoes dissociation.
Question 8
4 / -1

Which of the following compounds corresponds Van't Hoff factor (i) to be equal to 2 for dilute solution?

A
K₂SO₄

B
NaHSO₄

C
C1₂H₂₂O₁₁

D
MgSO₄

Solution

Van't hoff factor

i = αn + (1 α)

MgSO₄⟶ Mg⁺²+ SO₄^2-

i = 2
Question 9
4 / -1

Acetone has a vapour pressure of 185.2 mm Hg and ether 443.5 mm Hg at 20ºC. For a liquid mixture of acetone and ether containing 0.457 mole fraction of acetone, the partial pressure of ether is:

A
218.8 mm

B
240.8 mm

C
318.8 mm

D
381.8 mm

Solution

Mole fraction of ether in the liquid mixture = (1 – 0.457) = 0.543

Partial pressure of ether = 0.543 ×443.5 = 240.78 mm
Question 10
4 / -1

The boiling point of pure water is 373.15 K. If 32.5 g of KCN is dissolved in 100 mL of H₂O, then what is the boiling point of the solution? (Assume that molarity =molality)

(K_b for H₂O = 0.52 K kg mol⁻¹)(Molar mass of KCN = 65 gm mol⁻¹)

A
105.20°C

B
100.52°C

C
373.67 K

D
273.67 K

Solution

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Chemistry Test 202

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Chemistry Test 202

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Question 1

Second

more than zero but less than first

zero

first

Solution

Question 2

34.7kJmol−1

15.1kJmol−1

342kJmol−1

296kJmol−1

Solution

Question 3

256 times

512 times

64 times

128 times

Solution

Question 4

molL−1s−1

L−1mols−1

L2mol−2s−1

s−1

Solution

Question 5

Order can be determined only experimentally.

Order is not influenced by stoichiometric coefficient of the reactants.

Order of a reaction is sum of power to the concentration terms of reactants to express the rate of reaction.

Order of reaction is always whole number.

Solution

Question 6

3

4

1

2

Solution

Question 7

X is undergoing dissociation in water.

Molecular mass of X is greater than the molecular mass of Y.

Molecular mass of X is less than the molecular mass of Y.

Y is undergoing dissociation in water while X undergoes no change

Solution

Question 8

K2SO4

NaHSO4

C12H22O11

MgSO4

Solution

Question 9

218.8 mm

240.8 mm

318.8 mm

381.8 mm

Solution

Question 10

105.20°C

100.52°C

373.67 K

273.67 K

Solution

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34.7kJmol⁻¹

15.1kJmol⁻¹

342kJmol⁻¹

296kJmol⁻¹

molL⁻¹s⁻¹

L⁻¹mols⁻¹

L²mol⁻²s⁻¹

s⁻¹

K₂SO₄

NaHSO₄

C1₂H₂₂O₁₁

MgSO₄