Stoichiometry - Study Mode

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[#206] The density of a liquid is 1500 kg/m 3 . Its value in gin/litre will be equal to

(A) 1.5

(B) 15

(C) 150

(D) 1500

Correct Answer

(D) 1500

[#207] One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH 4 + 2O 2 → CO 2 + 2H 2 O. Both the reactants and products are in gas phase. ΔH° 298 = -730 kJ/mole of methane. Mole fraction of water vapour in the product gases is about

(A) 0.19

(B) 0.33

(C) 0.40

(D) 0.67

Correct Answer

(A) 0.19

[#208] The boiling points for pure water and pure toluene are 100°C and 110.6°C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. If, at a total pressure of one standard atm. exerted by the vapours of water and toluene, the mole fraction of water X w in the vapour phase satisfies

(A) 0 < X w < 0.5

(B) X w = 0.5

(C) 0.5 < X w < 1.0

(D) X w = 1.0

Correct Answer

(C) 0.5 < X w < 1.0

[#209] Heat of transition is the heat evolved or absorbed, when a substance is converted from

(A) Vapor to liquid

(B) Vapor to solid

(C) Solid to liquid

(D) One allotropic form to another allotropic form

Correct Answer

(D) One allotropic form to another allotropic form

[#210] __________ fuels require the maximum percentage of 'excess air' for complete combustion.

(A) Solid

(B) Liquid

(C) Gaseous

(D) Nuclear

Correct Answer

(A) Solid