2.3 grams of a mixture of NO2 and N2O4 have a pressure of 0.82 atm at temperature, T K and volume, V litres. If VT=1300, calculate PNO2. Assume that all the NO2 was converted into N2O4.

1. 0.52 atm                             
2. 0.38 atm

3. 0.19 atm                             

4. 0.41 atm

Subtopic:  Dalton's Law |
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

An evacuated glass vessel weighs 50.0 g when empty, 148.0 g when filled with a liquid of density 0.98 g mL1 and 50.5 g when filled with an ideal gas at 760 mm Hg at 300 K. Determine the molar mass of the gas.

1. 113 g mol1                              

2. 132 g mol1

3. 123 g mol1                              

4. 145 g mol1

Subtopic:  Ideal Gas Law |
 63%
From NCERT
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The average speed at T1 (in kelvin) and the most probable speed at T2 (in kelvin) of CO2 gas is 9.0 × 104 cm s1. Calculate the values of T1 and T2.

(A) 1682.5 K, 2143.4 K                     

(B) 1312.5 K, 1243.4 K

(C) 1881.5 K, 2233.4 K                     

(D) 1712.5 K, 24.13.4 K

Subtopic:  Molecular Velocity |
 53%
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Two flasks of equal volume are connected by a narrow tube (of negligible volume) at 27ºC and contain 0.70 mole of H2 at 0.5 atm. One of the flasks is then immersed in a hot bath, kept at 127 ºC, while the other remains at 27 ºC. The final pressure is -

1. 5.714 atm                   

2. 0.5714 atm

3. 2.5214 atm                 

4. 5.5114 atm

Subtopic:  Ideal Gas Law |
 72%
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A gas bulb of 1 litre capacity contains 2.0 × 1021 molecules of nitrogen exerting a pressure of 7.57 × 103 Nm2. Calculate the root mean square (rms) speed and the temperature of the gas molecules. If the ratio of most probable speed to the root mean square speed is 0.84, calculate the most probable speed for these molecules at this temperature.

(A) 41.54 m s1                               

(B) 125.14 m s1

(C) 315.12 m s1                              

(D) 415.14 m s1

Subtopic:  Ideal Gas Law |
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A mixture of 10 ml CH4, C2H4 and C2H2 has a vapour density of 11.3. Mixture contains x ml of CH4 , y ml of C2H4 and z ml of C2H2. When 30 ml of oxygen are sparked together over aqueous KOH, the volume contracts to 5.5 ml and then disappears when pyrogallol is introduced. If volumes are measured in the same conditions of pressure, temperature and humidity, value of x, y and z is–

(A) 4, 3, 3                                   

(B) 1, 2, 3

(C) 2, 1, 1,                                 

(D) 3, 4, 2

Subtopic:  Ideal Gas Law |
 51%
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The pressure in bulb dropped from 2000 to 1500 mm Hg in 47 mins. when the O2 present in the bulb leaked through a small hole. The bulb was then completely evacuated. A mixture of O2 and another gas of molecular weight of 79 in the molar ratio 1 : 1 at a total pressure of 4000 mm Hg was introduced. Find the mole ratio of two gases remaining in the bulb after a period of 74 mins.

(A) 1 : 1.236                       

(B) 1 : 2.136

(C) 1 : 3.336                       

(D) 2 : 1.136

Subtopic:  Graham's Law |
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The average molecular weight of air is 28.8 g mol1. At 20ºC, the pressure of air at a height of 6 km is half of that at the sea level. Assuming that air contains minute quantities of hydrogen, at what height the partial pressure of hydrogen would be one fourth of the partial pressure at the sea level ? The temperature may be assumed to be the same.

(1) 172.8 km                           

(2) 4.8 km

(3) 86.4 km                             

(4) 9.6 km

Subtopic:  Ideal Gas Law |
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Two gases occupy two containers A and B the gas in A, of volume 0.10 m3, exerts a pressure of 1.40 MPa and that in B of volume 0.15 m3 exerts a pressure 0.7 MPa. The two containers are united by a tube of negligible volume and the gases are allowed to intermingle. Then if the temperature remains constant, the final pressure in the container will be (in MPa)

(1) 0.70                               

(2) 0.98

(3) 1.40                               

(4) 210

Subtopic:  Ideal Gas Law |
 76%
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Given reaction : Cs + H2Og  COg + H2g. Calculate the volume at STP from 48 gm of carbon and excess H2O-

(A) 179.2 lit.                           

(B) 89.6 lit.

(C) 44.8 lit.                             

(D) 22.4 lit.

Subtopic:  Ideal Gas Law |
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