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Saturday, 31 October

JEE Main 2021 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 25 July 2021, Shift 1, Chemistry Q52

Question 52 of 90 in this shift, Chemistry question 22 of 30, Section B.

A home owner uses 4.00×103 m34.00\times10^3\ \mathrm{m^3} of methane (CH4\mathrm{CH_4}) gas, (assume CH4\mathrm{CH_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×105x\times10^5 g. The value of xx is _________. (Nearest integer) (Given R = 0.083 L atm K−1^{-1} mol−1^{-1})

Official answer

26

NTA final key.

Same idea in other shifts

Asked 10× in all
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  3. 24 Jun 2022, Shift 2 · Q81At 300 K, a sample of 3.0 g of gas A occupies the same volume as 0.2 g of hydrogen at 200 K at the same pressure. The molar mass of gas A…MediumNumerical value
  4. 26 Jun 2022, Shift 1 · Q62An evacuated glass vessel weighs 40.0 g when empty, 135.0 g when filled with a liquid of density 0.95 g mL−1^{-1} and 40.5 g when filled…MediumSingle correct
  5. 26 Jun 2022, Shift 1 · Q852.0 g of H2\mathrm{H_2} gas is adsorbed on 2.5 g of platinum powder at 300 K and 1 bar pressure. The volume of the gas adsorbed per gram…MediumNumerical value
  6. 27 Jun 2022, Shift 1 · Q50A mixture of hydrogen and oxygen has volume 2000 cm32000\ \mathrm{cm^3}, temperature 300 K, pressure 100 kPa and mass 0.76 g. The ratio of…MediumSingle correct
  7. 29 Jun 2022, Shift 2 · Q81A box contains 0.90 g of liquid water in equilibrium with water vapour at 27°C. The equilibrium vapour pressure of water at 27°C is 32.0…MediumNumerical value
  8. 31 Aug 2021, Shift 2 · Q7A mixture of hydrogen and oxygen has volume 500500 cm3^3, temperature 300300 K, pressure 400400 kPa and mass 0.760.76 g. The ratio of masses…MediumSingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.