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1
JEE Main 2021 (Online) 25th July Evening Shift
Numerical
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An LPG cylinder contains gas at a pressure of 300 kPa at 27$$^\circ$$. The cylinder can withstand the pressure of 1.2 $$\times$$ 106 Pa. The room in which the cylinder is kept catches fire. The minimum temperature at which the bursting of cylinder will take place is __________$$^\circ$$ C. (Nearest integer)
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2
JEE Main 2021 (Online) 25th July Morning Shift
Numerical
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A home owner uses 4.00 $$\times$$ 103 m3 of methane (CH4) gas, (assume CH4 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 $$\times$$ 105 g. The value of x is __________. (Nearest integer)

(Given R = 0.083 L atm K$$-$$1 mol$$-$$1)
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3
JEE Main 2021 (Online) 17th March Evening Shift
Numerical
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The number of chlorine atoms in 20 mL of chlorine gas at STP is _________ 1021. (Round off to the Nearest Integer).

[Assume chlorine is an ideal gas at STP

R = 0.083 L bar mol$$-$$1 K$$-$$1, NA = 6.023 $$\times$$ 1023]
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4
JEE Main 2021 (Online) 17th March Morning Shift
Numerical
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The pressure exerted by a non-reactive gaseous mixture of 6.4g of methane and 8.8 g of carbon dioxide in a 10L vessel at 27$$^\circ$$C is __________ kPa. (Round off to the Nearest Integer).

[Assume gases are ideal, R = 8.314 J mol$$-$$1 K$$-$$1

Atomic masses : C : 12.0 u, H : 1.0 u, O : 16.0 u]
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