Physical Chemistry MCQ with Answers

Physical Chemistry MCQ with Answers

176) The average kinetic energy of one molecule of an ideal gas at 27^oC and 1 atm pressure is:

Answer is:

6.21 x 10⁻²¹ J⁄K molecule

177) The pressure P of a gas is plotted against its absolute temperature T for two different constant volumes, V1 and V2. When V1 > V2, the:

Answer is:

Curve for V2 has a greater slope than that of V1

Explanation:

At constant volume, P is directly proportional to T.

178) A balloon filled with hydrogen at 1 atm and 27^oC has volume equal to 12000 L. On ascending, it reaches a place where the temperature is −23^oC and pressure is 0.5 atm. The volume of the balloon is:

Answer is:

20000 L

179) A bottle of cold drink contains 200 mL liquid in which CO₂ is 0.1M. Suppose CO₂ behaves like an ideal gas, the volume of the dissolved CO₂ at STP is:

Answer is:

0.448 L

180) If HCOOH + NaOH ⇶ HCOONa + H₂O, ΔH = −13.1 kcal, then enthalpy of dissociation of HCOOH will be:

Answer is:

600 cal

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