A mixture of two gases A and B in the mole ratio 2 : 3 is kept in a 2 litre vessel. A second 3 litre vessel has the same two gases in the mole ratio 3 : 5. Both gas mixtures have the same temperature and same total pressure. They are allowed to intermix ,the final temperature and total pressure are the same as the initial values, the final volume being 5 litres. Given that the molar masses are MA and MB, what is the mean molar mass of the final mixture?

(1) 77MA+123MB200

(2) 123MA+77MB200

(3) 77MA+123MB250

(4) 123MA+77MB250 

Subtopic:  Ideal Gas Law |
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NEET 2023 - Target Batch - Aryan Raj Singh
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A 2 m long tube closed at one end is lowered vertically into' water until the closed end is flush with the water surface. See figure below. Calculate the water level height in the tube. (Barometric pressure –1 atm =10 m of hydrostatic water head, Temperature = 25°C, Density of, water = 1.00 g/ml. Neglect water vapour pressure).

(1) 1.01 m

(2) 0.29 m

(3) 1.71m

(4) 0.92 m

Subtopic:  Gas Laws |
 55%
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At a certain temperature for which RT = 25 lit. atm. mol–1, the density of a gas, in gm lit–1, is d = 2.00P + 0.020 P2, where P is the pressure in atmosphere. The molecular weight of the gas in gm mol–1 is-

1. 25

2. 50

3. 75

4. 100

Subtopic:  Ideal Gas Law |
 72%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

A mixture of carbon monoxide and carbon dioxide is found to have a density of 1.7 g/L at S.T.P. The mole fraction of carbon monoxide is-

1. 0.37

2. 0.40

3. 0.30

4. 0.50

Subtopic:  Ideal Gas Law |
From NCERT
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Themolecular radius for a certain gas = 1.25 A. What is a reasonable estimate of the magnitude of the van der Wails constant, b, for the gas?

(1) 0.98 × 10–2 litre/mole

(2) 1.43 × 10–2 litre/mole

(3) 1.97 × 10–2 litre/mole

(4) 3.33 × 10–2 litre/mole

Subtopic:  van der Waal’s Correction |
 51%
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The van der Waal's constant 'b' for N2 and H2 has the values 0.039 lit moil–1 and 0.0266 lit mo1–1. The density of solid N2 is 1 g cm–3. Assuming the molecules in the solids to be close packed with the same percentage void, the density of solid H2 would be (in g cm–3)

(1) 0.114

(2) 0.682

(3) 1.466

(4) 0.071

Subtopic:  van der Waal’s Correction |
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NEET 2023 - Target Batch - Aryan Raj Singh
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A certain gas effuses out of two different vessels A and B. A has a circular orifice while B has a square orifice of length equal to the radius of the orifice of vessel A. The ratio of rate of diffusion of the gas from vessel A to that from vessel B is

(1) π : 1

(2) 1 : π

(3) 1 : 1

(4) 3 : 2

Subtopic:  Graham's Law |
 59%
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A sample of a given mass of a gas at a constant temperature occupies 95cm3 under a pressure of 9.962×104Nm2. At the same temperature, the volume at a pressure of 10.13×104Nm2 is [Bihar CEE 1992]

1. 190 cm3

2. 93 cm3

3. 46.5 cm3

4. 47.5 cm3

Subtopic:  Gas Laws |
 85%
From NCERT
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A gas occupied a volume of 250 ml at 700 mm Hg pressure and 25°C. An additional pressure is required to reduce the gas volume to its 4/5th value at the same temperature is-

1. 225 mm Hg

2. 175 mm Hg

3. 150 mm Hg

4. 265 mm Hg

Subtopic:  Gas Laws |
 82%
From NCERT
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At constant temperature, if pressure increases by 1%, the percentage decrease of volume is-

1. 1%

2. 100/101%

3. 1/101%

4. 1/100%

Subtopic:  Gas Laws |
 54%
From NCERT
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