States of Matter · JEE Main previous year questions

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2021 6 questions

Q902021 · 1 Sept 2021 · Shift 2· Numerical answer
An empty LPG cylinder weighs 14.8 kg. When full, it weighs 29.0 kg and shows a pressure of 3.47 atm. In the course of use at ambient temperature, the mass of the cylinder is reduced to 23.0 kg. The final pressure inside of the cylinder is _________ atm. (Nearest integer) (Assume LPG to be an ideal gas)
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Answer: 2
Q752021 · 27 Jul 2021 · Shift 2
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : $S O_{2} (g)$ is adsorbed to a larger extent than $H_{2} (g)$ on activated charcoal. Reason R : $S O_{2} (g)$ has a higher critical temperature than $H_{2} (g)$ . In the light of the above statements, choose the most appropriate answer from the options given below.
1. A.Both A and R are correct but R is not the correct explanation of A.
2. B.Both A and R are correct and R is the correct explanation of A.
3. C.A is not correct but R is correct.
4. D.A is correct but R is not correct.
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Answer: B
Q832021 · 27 Jul 2021 · Shift 2· Numerical answer
$2 S O_{2} (g) + O_{2} (g) \to 2 S O_{3} (g)$ The above reaction is carried out in a vessel starting with partial pressure $P_{S O_{2}} = 250 m bar$ , $P_{O_{2}} = 750 m bar$ and $P_{S O_{3}} = 0 bar$ . When the reaction is complete, the total pressure in the reaction vessel is __________ m bar. (Round off of the nearest integer).
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Answer: 875
Q842021 · 25 Jul 2021 · Shift 1· Numerical answer
$C O_{2}$ gas is bubbled through water during a soft drink manufacturing process at 298 K. If $C O_{2}$ exerts a partial pressure of 0.835 bar then x m mol of $C O_{2}$ would dissolve in 0.9 L of water. The value of x is ____. (Nearest integer) (Henry's law constant for $C O_{2}$ at 298 K is $1.67 \times 1 0^{3}$ bar)
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Answer: 25
Q902021 · 25 Jul 2021 · Shift 1· Numerical answer
A home owner uses $4.00 \times 1 0^{3} m^{3}$ of methane ( $C H_{4}$ ) gas, (assume $C H_{4}$ is an ideal gas) in a year to heat his home. Under the pressure of 1.0 atm and 300 K, mass of gas used is $x \times 1 0^{5}$ g. The value of x is ____. (Nearest integer) (Given R = 0.083 L atm $K^{- 1} mo l^{- 1}$ )
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Answer: 26
Q902021 · 26 Feb 2021 · Shift 1· Numerical answer
A certain gas obeys $P (V_{m} - b) = R T$ . The value of $(\frac{\partial Z}{\partial P})_{T}$ is $\frac{x b}{R T}$ . The value of x is _________. (Integer answer) (Z : compressibility factor)
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Answer: 1