# Quiz

#### Topics11th And 12thChemistryStates Of Matter

Question: Calculate the volume occupied by 16 gram O2 at 300 K and 8.31 Mpa if PcVRTc=38 and PrVrTr=2.21       :R=8.314 MpaKmol
Options:
 A. 124.31 lit B. 124.31 mL C. 248.62 mL D. 248.62 L
: B

PVmRT=38×2.21;Vm=38×2.21×RTP Vm=38×2.21×8.314×3008.314=248.625mL VO2=1632×248.625=124.31mL

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### More Questions on This Topic :

Question 1. The rate of diffusion of Methane at certain temperature is 2 times that of gas X. The molecular mass of X is___.
1.    64
2.    32
3.    4
4.    8
: A

Mx16=rCH4rx=21 Squaring both sides, we get Mx=16×4=64
Question 2. A glass tube of volume 112 ml containing a gas is partially evacuated till the pressure in it drops to 3.8×105 torr at 00 C. The number of molecules of the gas remaining in the tube is
1.    3.7×1017
2.    1.5×1014
3.    4.5×1018
4.    1.5×1019
: B

PV=nRT
n=PVRT=3.8×105×112×10362.4×273
=0.02461×108mol
No. of molecules = 0.02461×108mol
=1.5×1014
Question 3. Which of the given sets of temperature and pressure will cause a gas to exhibit the greatest deviation from ideal gas behavior
1.    100∘ C and 4 atm
2.    100∘ C and 2 atm
3.    -100∘ C and 4 atm
4.    0∘ C and 2 atm
: C

Gas deviate from ideal gas behaviour to real gas (according to Vander Waal's at low temperature and high pressure)
Question 4. If pressure becomes double at the same absolute temperature on 2 L of  CO2 , then the final volume of CO2 will be?
1.    2 L
2.    4 L
3.    25 L
4.    1 L
: D

P1P2 = 12 V1V2 =P1P2 = 21 2LV2 = 12 ; V2 = 1L
Question 5. A sample of O2 gas is collected over water at 23 C at a barometric pressure of 751 mm Hg (vapour pressure of water at 23 C is 21 mm Hg). The partial pressure of O2 gas in the sample collected is ......
1.    21 mm Hg
2.    751 mm Hg
3.    0.96 atm
4.    1.02 atm
: C

Pressure ofO2(dry) = 751 - 21 = 730 mm Hg = 730760= 0.96 atm
Question 6. According to kinetic theory of gases, for a diatomic molecule

1.    The pressure exerted by the gas is proportional to the mean velocity of the molecules
2.    The pressure exerted by the gas is proportional to the root mean square velocity of the molecules
3.    The root mean square velocity is inversely proportional to the temperature
4.    The mean translational kinetic energy of the molecules is proportional to the absolute temperature