Classes

First Year Chemistry Gases


Change the way you learn with Maqsad's classes. Local examples, engaging animations, and instant video solutions keep you on your toes and make learning fun like never before!

Class 9Class 10First YearSecond Year
d.Whydowefeelcomfortableinexpressingthedensitiesofgasesintheunitsofgdm3ratherthangcm3aunitwhichisusedtoexpressthedensitiesofliquidsandsolids.d. Why do we feel comfortable in expressing the densities of gases in the units of \mathrm{g} \mathrm{dm}^{-3} rather than \mathrm{g} \mathrm{cm}^{-3} a unit which is used to express the densities of liquids and solids.

(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?

banner6000+ MCQs with instant video solutions