When a gas is heated the particles move more quickly. What is the change in volume of a heated gas if the pressure is kept constant ?
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The specific heat at constant volume for a gas is 0.075 cal/g and at constant pressure it is 0.125 cal/g. Calculate, (i) the molecular weight of gas,
(i) `C_(P)-C_(V)=(R)/(M)` where, M=molecular of gas `0.125-0.075=(1.987)/(M)` `M=39.74~~40` (ii) `(C_(P))/(C_(V))=gamma` `therefore=(0.125)/(0.075)=1.66` `therefore` 1.66 value of `gamma` shows that the gas is monoatomic.
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When an ideal gas is heated at constant pressure, the fraction of the heat energy supplied whicn increases the internal energy of the gas is :
Correct Answer - D `{:(dQ=dW+dU,,,,),(dQ=PdV+dU,,,,),(dQ=nRdT+dU,,,,):}` `dQ=(2dU)/(f)+dU" "[dU=(nfRdT)/(2)]` `(dU)/(dQ)=(1)/(((2)/(f)+1))` `(dU)/(dQ)=(5)/(7)`
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When two mole of an ideal gas `(C_(p.m) = (5)/(2)R)` heated from `300 K` to `600 K` at constant pressure. The change in entropy of gas `(DeltaS)` is:
Correct Answer - C `DeltaS = nC_(p.m) "In" (T_(2))/(T_(1)) = 2 xx (5)/(2)"R In" (600)/(300) = 5"R In 2`
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By how much does the entropy of `3` mole of an ideal gas change in going from a pressure of `2` bar to a pressure of `1` bar without any change in Tem
Correct Answer - B `DeltaS (gas) = "nR In" (P_(1))/(P_(2)) = 3 xx 8.314 xx "In"2 = 17.29` J/K Since `DeltaT =0 , "therefore" " " DeltaU =0.` So, `q=-W` `="nRT"[1...
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A sample of certain mas s of an ideal polyatomic gas is expanded against constant pressure of 1 atm adiabatically from volume 2L , pressure 6 atm and
Correct Answer - 6 `W=-P_("ext")(V_(f)-V_(i))` =- (1 atm) (8-2)L =- 6L atm as q=0 so `DeltaE=w " " implies " " 3(8P_(f) -12)=-6` `8P_(f) =12 -(6)/(3)=10 implies P_(f)=(5)/(4) atm` so `(T_(f))/(T_(i))=((5)/(4)xx3)/(6xx2)=(10)/(12)`...
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A mass of gas exerts a pressure of `72 cm` of Hg at `27^(@)C`. It is heated at constant volume so that its pressure after some time is `90 cm` of Hg.
Correct Answer - `102^(@)C`
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The pressure of a gas is changed at constant volume from `200 Nm^(-2)` to `3000 Nm^(-2)`. If the initial temperature of the gas is `77^(@)C`, what wil
Correct Answer - `525 K`
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At constant temperature the pressure of 22.4 dm^3 volume of an ideal gas was increased from 10^5 kPa to 210 kPa, New volume could be -
Option : b. 11.2 dm3
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Two particles move in a uniform gravitational field with an acceleration g. At the intial moment the particles were located at one point and moved wit
Correct Answer - 0.2 sec
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10. Lymph differs from blood in possessing (1) More proteins and less waste products (2) Less proteins and more waste products (3) More proteins and more waste products (4) Less proteins and less waste products
(2) Less proteins and more waste products
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