States of Matter : Gases & Liquids Test 13

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States of Matter : Gases & Liquids Test 13

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Weekly Quiz Competition

Question 1
1 / -0

Direction (Q. Nos. 1-9) This section contains 9 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.
Q. A person living in Shimla observed that cooking of food without using pressure cooker takes more time. The reason for this observation is that at high altitude

A
pressure increases

B
pressure decreases

C
temperature increases

D
temperature decreases

Solution

At high altitude, atmospheric pressure is low. Therefore, liquids at high altitude boil at lower temperatures in comparison to that at sea level hence pressure cooker is used for cooking food.
Question 2
1 / -0

Atmospheric pressures recorded in four metro cities are as follows :

Q. Based on the above data, order in which water will boil (starting the earliest) in these cities is

A
I > III > IV > II

B
II > IV > III > I

C
I > III > II > IV

D
IV > II > III > I

Solution

For water to boil, it needs to balance the atmospheric pressure exerted on it. It will be easy for water to boil when atmospheric pressure is less. So for the answer, the pressure would be arranged from least pressure to highest pressure and this will be the order of decreasing ease of boiling point.
Question 3
1 / -0

At a given temperature, total vapour pressure (in torr) of a mixture of volatile components A and B is g iven by p_total = 120 - 75 x B.
Hence, vapour pressure of pure A and B respectively are

A
120,75

B
120,95

C
120,45

D
75,45

Solution
Question 4
1 / -0

Vapour pressure of mixture of 1 mole volatile liquid A and 1 mole volatile liquid B is 350 mm Hg at 50°C. On adding 2 moles of A Into mixture, vapour pressure increases by 25 mm Hg. Thus, vapour pressure of pure components are (in mm Hg)

A
a

B
b

C
c

D
d

Solution

We have from Raoult’s law;-
P_mixture = x_aPa+x_bPb
350 = 1/2×Pa+1/2×Pb
Pa+Pb = 700
And 375 = 3/4Pa+1/4pb
On solving both equations, we get Pa = 400 and Pb = 300
Question 5
1 / -0

Vapour pressure of a liquid is 380 mm Hg at 300 K and 570 mm Hg at 350 K. Thus, its normal boiling point is (log2 = 0.3010, log 1.5= 0.1761)

A
400 K

B
397 K

C
380 K

D
300 K
Question 6
1 / -0

Heat of vaporisation of H₂O is 40.6 kJ mol^-1. At a 4000 m attitude , the atmospheric pressure is about 0.605 atm. What boiling point would you expect for water under these conditions?

A
100^oC

B
90^oC

C
86.2^oC

D
56.2^oC
Question 7
1 / -0

Arrange ortho, meta and para-nitrophenols in increasing boiling points

A
para < meta < ortho

B
ortho < para < meta

C
ortho = para = meta

D
ortho < meta < para

Solution

Para has max packing efficiency due to its symmetrical structure and it also forms intermolecular H-bonds. Meta derivative has comparatively low packing efficiency but forms intermolecular H-bonds and ortho derivative has the least packing efficiency and does not form intermolecular hydrogen bonds instead it forms intramolecular hydrogen bond which doesn't have any role in increasing the boiling point.
Question 8
1 / -0

A chemist decides to find the vapour pressure of water by the gas saturation method . 100 L of N₂ gas is passed through 65.44 g of water. After passage of the gas, 63.13 g water remained. The temperature of water is 298 K.
Thus, vapour pressure of water is

A
23.86 mm

B
652.13 mm

C
676 mm

D
736.14 mm
Question 9
1 / -0

Choose the correct statement with respect to the vapour pressure of a liquid among the following.

A
Increases linearly with increasing temperature

B
Increases non-linearly with increasing temperature

C
Decreases linearly with increasing temperature

D
Decreases non-linearly with increasing temperature

Solution

Vapour pressure is defined as the pressure exerted by the vapours above the liquid surface in equilibrium with the liquid at a given temperature. The vapour pressure of a liquid increases non-linearly with increasing temperature.
This is because kinetic energy is the function of temperature which means that as the temperature is increased, more molecules will have greater kinetic energies and thus they can escape from the surface of the liquid to the vapour phase resulting in higher vapour pressure.

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States of Matter : Gases & Liquids Test 13

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States of Matter : Gases & Liquids Test 13

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SHARING IS CARING

Question 1

pressure increases

pressure decreases

temperature increases

temperature decreases

Solution

Question 2

I > III > IV > II

II > IV > III > I

I > III > II > IV

IV > II > III > I

Solution

Question 3

120,75

120,95

120,45

75,45

Solution

Question 4

a

b

c

d

Solution

Question 5

400 K

397 K

380 K

300 K

Question 6

100oC

90oC

86.2oC

56.2oC

Question 7

para < meta < ortho

ortho < para < meta

ortho = para = meta

ortho < meta < para

Solution

Question 8

23.86 mm

652.13 mm

676 mm

736.14 mm

Question 9

Increases linearly with increasing temperature

Increases non-linearly with increasing temperature

Decreases linearly with increasing temperature

Decreases non-linearly with increasing temperature

Solution

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100^oC

90^oC

86.2^oC

56.2^oC