States of Matter · JEE Main previous year questions

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2022 13 questions

Q842022 · 29 Jul 2022 · Shift 1· Numerical answer
If $O_{2}$ gas is bubbled through water at $303 K$ , the number of millimoles of $O_{2}$ gas that dissolve in $1 litre$ of water is __________. (Nearest Integer) (Given : Henry's Law constant for $O_{2}$ at $303 K$ is $46.82 k bar$ and partial pressure of $O_{2} = 0.920 bar$ ) (Assume solubility of $O_{2}$ in water is too small, nearly negligible)
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Answer: 1
Q752022 · 29 Jul 2022 · Shift 2
Given below are the critical temperatures of some of the gases: $Gas He C H_{4} C O_{2} N H_{3} Critical temperature (K) 5.2 190.0 304.2 405.5$ The gas showing least adsorption on a definite amount of charcoal is
1. A. $He$
2. B. $C H_{4}$
3. C. $C O_{2}$
4. D. $N H_{3}$
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Answer: A
Q882022 · 29 Jul 2022 · Shift 2· Numerical answer
'x' g of molecular oxygen ( $O_{2}$ ) is mixed with $200 g$ of neon (Ne). The total pressure of the non-reactive mixture of $O_{2}$ and Ne in the cylinder is $25 bar$ . The partial pressure of Ne is $20 bar$ at the same temperature and volume. The value of 'x' is ____. [Given: Molar mass of $O_{2} = 32 g mo l^{- 1}$ . Molar mass of $Ne = 20 g mo l^{- 1}$ ]
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Answer: 80
Q732022 · 27 Jul 2022 · Shift 1
Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Activated charcoal adsorbs $SO_{2}$ more efficiently than $CH_{4}$ . Reason R : Gases with lower critical temperatures are readily adsorbed by activated charcoal. In the light of the above statements, choose the correct answer from the options given below.
1. A.Both A and R are correct and R is the correct explanation of A.
2. B.Both A and R are correct but R is NOT the correct explanation of A.
3. C.A is correct but R is not correct.
4. D.A is not correct but R is correct.
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Answer: C
Q882022 · 27 Jul 2022 · Shift 2· Numerical answer
For a real gas at $2 5^{\circ} C$ temperature and high pressure ( $99 bar$ ) the value of compressibility factor is 2, so the value of van der Waals constant 'b' should be ____ $\times 1 0^{- 2} L mo l^{- 1}$ (Nearest integer) (Given $R = 0.083 L bar K^{- 1} mo l^{- 1}$ )
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Answer: 25
Q902022 · 26 Jul 2022 · Shift 1· Numerical answer
A mixture of hydrogen and oxygen contains 40% hydrogen by mass when the pressure is 2.2 bar. The partial pressure of hydrogen is _________ bar. (Nearest Integer)
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Answer: 2
Q902022 · 25 Jul 2022 · Shift 2· Numerical answer
A sealed flask with a capacity of $2 d m^{3}$ contains $11 g$ of propane gas. The flask is so weak that it will burst if the pressure becomes $2 MPa$ . The minimum temperature at which the flask will burst is ____ $^{\circ} C$ . [Nearest integer] (Given : $R = 8.3 J K^{- 1} mo l^{- 1}$ , Atomic masses of C and H are $12 u$ and $1 u$ , respectively.) (Assume that propane behaves as an ideal gas.)
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Answer: 1655
Q622022 · 30 Jun 2022 · Shift 1
1. A.A and C
2. B.B and A
3. C.D and A
4. D.C and D
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Answer: A
Q832022 · 30 Jun 2022 · Shift 1· Numerical answer
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Answer: 1718
Q902022 · 28 Jun 2022 · Shift 2· Numerical answer
$100 g$ of an ideal gas is kept in a cylinder of $416 L$ volume at $2 7^{\circ} C$ under $1.5 bar$ pressure. The molar mass of the gas is ____ $g mo l^{- 1}$ . (Nearest integer) (Given : $R = 0.083 L bar K^{- 1} mo l^{- 1}$ )
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Answer: 4
Q752022 · 27 Jun 2022 · Shift 2
1. A.
2. B.
3. C.
4. D.
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Answer: B
Q722022 · 26 Jun 2022 · Shift 1
An evacuated glass vessel weighs 40.0 g when empty, 135.0 g when filled with a liquid of density $0.95 g mL^{- 1}$ and 40.5 g when filled with an ideal gas at 0.82 atm at 250 K. The molar mass of the gas in $g mol^{- 1}$ is : (Given : $R = 0.082 L atm K^{- 1} mol^{- 1}$ )
1. A.35
2. B.50
3. C.75
4. D.125
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Answer: D
Q812022 · 24 Jun 2022 · Shift 2· Numerical answer
A company dissolves 'x' amount of $CO_{2}$ at $298 K$ in $1 litre$ of water to prepare soda water. $X = \times 1 0^{- 3} g$ . (nearest integer) (Given : partial pressure of $CO_{2}$ at $298 K = 0.835 bar$ . Henry's law constant for $CO_{2}$ at $298 K = 1.67 kbar$ . Atomic mass of $H$ , $C$ and $O$ is $1$ , $12$ , and $16 g mol^{- 1}$ , respectively)
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Answer: 1221