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First Year Chemistry Gases


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Class 9Class 10First YearSecond Year
Q12.a.Whatiskineticmoleculartheoryofgases?Giveitspostulates.Q12. a.What is kinetic molecular theory of gases? Give its postulates.

(b) Compare the rates of diffusion of the following pairs of gases:(i) H_{2} and D_{0} :
(b) Compare the rates of diffusion of the following pairs of gases:(i)  H_{2}  and  D_{0}  :

(b)Comparetheratesofdiffusionofthefollowingpairsofgases:(i)H2andD0:(b) Compare the rates of diffusion of the following pairs of gases:(i) H_{2} and D_{0} :

Q15 Explain the following facts(iv) Water vapours do not behave ideally at 273 \mathrm{~K} .
Q15 Explain the following facts(iv) Water vapours do not behave ideally at  273 \mathrm{~K} .

Q15Explainthefollowingfacts(iv)Watervapoursdonotbehaveideallyat273 K.Q15 Explain the following facts(iv) Water vapours do not behave ideally at 273 \mathrm{~K} .

Q8. Derive the units for gas constant R in general gas cquation: when energy is expressed in ergs.
Q8. Derive the units for gas constant  R  in general gas cquation: when energy is expressed in ergs.

Q8.DerivetheunitsforgasconstantRingeneralgascquation:whenenergyisexpressedinergs.Q8. Derive the units for gas constant R in general gas cquation: when energy is expressed in ergs.

Fill in the blanks.(i). The product PV has the S.I. unit of(ii). Eight grams each of \mathrm{O}_{2} and \mathrm{H}_{2} at 27^{\circ} \mathrm{C} will have total \mathrm{K} . \mathrm{E} in the ratio of(iii). Smell of the cooking gas during leakage from a gas cylinder is due to the property of of gases.(iv). Equal of ideal gases at the same temperature and pressure contain number of molecules.(v). The temperature above which a substance exists only as a gas is called
Fill in the blanks.(i). The product PV has the S.I. unit of(ii). Eight grams each of  \mathrm{O}_{2}  and  \mathrm{H}_{2}  at  27^{\circ} \mathrm{C}  will have total  \mathrm{K} . \mathrm{E}  in the ratio of(iii). Smell of the cooking gas during leakage from a gas cylinder is due to the property of of gases.(iv). Equal of ideal gases at the same temperature and pressure contain number of molecules.(v). The temperature above which a substance exists only as a gas is called

Fillintheblanks.(i).TheproductPVhastheS.I.unitof(ii).EightgramseachofO2andH2at27CwillhavetotalK.Eintheratioof(iii).Smellofthecookinggasduringleakagefromagascylinderisduetothepropertyofofgases.(iv).Equalofidealgasesatthesametemperatureandpressurecontainnumberofmolecules.(v).ThetemperatureabovewhichasubstanceexistsonlyasagasiscalledFill in the blanks.(i). The product PV has the S.I. unit of(ii). Eight grams each of \mathrm{O}_{2} and \mathrm{H}_{2} at 27^{\circ} \mathrm{C} will have total \mathrm{K} . \mathrm{E} in the ratio of(iii). Smell of the cooking gas during leakage from a gas cylinder is due to the property of of gases.(iv). Equal of ideal gases at the same temperature and pressure contain number of molecules.(v). The temperature above which a substance exists only as a gas is called

7. 1.40 \mathrm{dm}^{3} volume of a gas measured at a temperature of 27^{\circ} \mathrm{C} and a pressure of 900 torr was found to have mass 2.273 \mathrm{~g} . Calculate the molecular mass of the gas [Hint: Calculate " n " by the formula PV=nRT and then molecular mass] (33.72 amu) Ans.
7.  1.40 \mathrm{dm}^{3}  volume of a gas measured at a temperature of  27^{\circ} \mathrm{C}  and a pressure of 900 torr was found to have mass  2.273 \mathrm{~g} . Calculate the molecular mass of the gas [Hint: Calculate "  n  " by the formula PV=nRT and then molecular mass] (33.72 amu) Ans.

7.1.40dm3volumeofagasmeasuredatatemperatureof27Candapressureof900torrwasfoundtohavemass2.273 g.Calculatethemolecularmassofthegas[Hint:Calculate"n"bytheformulaPV=nRTandthenmolecularmass](33.72amu)Ans.7. 1.40 \mathrm{dm}^{3} volume of a gas measured at a temperature of 27^{\circ} \mathrm{C} and a pressure of 900 torr was found to have mass 2.273 \mathrm{~g} . Calculate the molecular mass of the gas [Hint: Calculate " n " by the formula PV=nRT and then molecular mass] (33.72 amu) Ans.

Q21.a. The relative densities of two gases \mathrm{A} and \mathrm{B} are 1: 1.5 . Find out the volume of B which will diffuse in the same time in which 150 \mathrm{dm}^{3} of A will diffuse?
Q21.a. The relative densities of two gases  \mathrm{A}  and  \mathrm{B}  are  1: 1.5 . Find out the volume of B which will diffuse in the same time in which  150 \mathrm{dm}^{3}  of A will diffuse?

Q21.a.TherelativedensitiesoftwogasesAandBare1:1.5.FindoutthevolumeofBwhichwilldiffuseinthesametimeinwhich150dm3ofAwilldiffuse?Q21.a. The relative densities of two gases \mathrm{A} and \mathrm{B} are 1: 1.5 . Find out the volume of B which will diffuse in the same time in which 150 \mathrm{dm}^{3} of A will diffuse?

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