# NEET-2022

## CHEMISTRY

1. A cylinder contains SO2 gas at a pressure of 4.1 atmosphere and at 47°C temperature. The density of the gas in the cylinder is
(1) 0.2 g/ml          (2) 0.4 g/ml
(3) 0.01 g/ml       (4) 10 g/ml
2.  Under the identical condition of temperature and pressure, the rate of effusion will be maximum for
(1) He                (2) H2
(3) CO2             (4) CH4
3. If volume of fixed mass of gas at constant temperature is increased by 25%, the pressure of gas will be
(1) Decreased by 25% (2) Decreased by 20%
(3) Increased by 20% (4) Decreased by 22%
50. By what factor does the rms velocity of gaseous molecules increases when the temperature in kelvin is tripled?
(1) 9 (2) 3
(3) 1.73 (4) 6
4.  A gaseous mixture contains 220 g of carbon dioxide and 280 g of nitrogen gas. If the partial pressure of nitrogen gas in the mixture is 1.5 atm then the partial pressure of carbon dioxide gas in the mixture will be
(1) 1.25 atm (2) 0.75 atm
(3) 0.50 atm (4) 3 atm
5. The gas which will be most easily liquefied is
(1) He (2) O2
(3) NH3 (4) CO2
6. Unit of surface tension is
(1) N m2 (2) N m–2
(3) N m–1 (4) N m
7. A gas is allowed to expand in an insulated container against a constant external pressure of 3 atm from an initial volume of 5.0 L to final volume of 9.0 L. The change in internal energy U of the gas is
(1) –1.2 kJ (2) –3.4 kJ
(3) –4.5 kJ (4) –6.2 kJ
8. For a reaction to be spontaneous at all temperature, which of the following set of conditions is true?
(1) H 0 and S  0 (2) H 0 and S  0
(3) H 0 and S  0 (4) H 0 and S  0
9. 2 moles of an ideal gas undergoes expansion in volume at 37°C from 2 L to 20 L isothermally and reversibly. The enthalpy change in the process is
(1) –11.87 kJ (2) +11.87 kJ
(3) Zero (4) –6.25 kJ
10. For the given reaction A(l)  2B(g); 1 U 4.5 kcal, S 12 calK      at 27°C. Hence G for the reaction is
(1) –5.4 kcal (2) –8.5 kcal
(3) –6.9 kcal (4) –12.5 kcal
11. If heat of combustion of methane is –890 kJ/mol, then amount of heat released when 13.2 g of CO2 is produced on combustion of methane is
(1) 267 kJ (2) 315 kJ
(3) 420 kJ (4) 175 kJ
12. The bond energies of H – H and I – I bonds are 435 kJ mol–1 and 150 kJ mol–1 respectively.If of H for HI is 26.5 kJ mol–1 then bond enthalpyof H – I bond is
(1) 558.5 kJ/mol (2) 266 kJ/mol
(3) 611.5 kJ/mol (4) 293 kJ/mol
13.  For which of the following processes, entropy change is negative?
(1) Evaporation of water
(2) Sublimation of camphor
(3) Condensation of iodine vapours
(4) Melting of ice
14. The difference between heat of reaction at constant pressure and at constant volume for the reaction C6H12(l) + 9O2(g)  6CO2(g) + 6H2O(l), at 27°C is
(1) –14.96 kJ (2) –7.48 kJ
(3) +7.43 kJ (4) –10.23 kJ
15.  Which among the following is tetrahedral in shape?
(1) SF4 (2) CCl4
(3) XeF4 (4) SO3
16.  Same volume of two gases X and Y diffuses through same pin holes in 15 and 25 seconds respectively under identical conditions. If the molar mass of X is 30 g/mole then the molar mass of Y will be
(1) 25.5 g/mol (2) 83.3 g/mol
(3) 55 g/mol (4) 64 g/mol
17. Bond order of 2 O is
(1) 1.5 (2) 2
(3) 2.5 (4) 3
18. Odd electron molecule among the following is
(1) SF6 (2) NO2
(3) H2 (4) H2O
19. Which among the following is/are intensive property?
(1) Pressure (2) Enthalpy
(3) Density (4) Both (1) and (3)
20. On increasing temperature, which of the following decreases?
(1) Vapour pressure of liquid
(2) Viscosity of liquid
(3) Kinetic energy of gas
(4) Rate of evaporation of liquid

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