A. -273
B. 0
C. -78
D. 5
Related Mcqs:
- The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at ______________ percent relative humidity ?
A. 0
B. 100
C. 50
D. None of these - Choose the condition that must be specified in order to liquify CO2 (triple point for CO2 is – 57°C and 5.2 atm) ?
A. Pressure must be kept below 5.2 atm
B. Temperature must be kept above – 57°C
C. Pressure must be kept below 5.2 atm. and temperature must be kept above 57°C
D. Pressure and temperature must be kept below 5.2 atm. and – 57°C respectively - Consider the reaction, C + O2 ⇌ CO2; ΔH = – 94 kcal. What will be the value of ΔH for the reaction CO2 → C + O2 ?
A. -94 kcal
B. +94 kcal
C. > 94 kcal
D. < -94 kcal - Specific ____________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.)?
A. Entropy
B. Internal energy
C. Enthalpy
D. Gibbs free energy - “Dry ice” is________________?
A. Moisture free ice
B. Solid helium
C. Solid carbon dioxide
D. None of these - The combustion equations of carbon and carbon monoxide are as follows: C + O2 = CO2, ΔH = – 394 kJ/kg .mole CO + ½ O2 = CO2, ΔH = – 284.5 kJ/kg. mole. The heat of formation of CO is _____________ kJ/kg. mole?
A. -109.5
B. +109.5
C. +180
D. +100 - Assuming that CO2 obeys perfect gas law, calculate the density of CO2 (in kg/m3) at 263°C and 2 atm ?
A. 1
B. 2
C. 3
D. 4 - ____________ does not change during phase transformation processes like sublimation, melting & vaporisation?
A. Entropy
B. Gibbs free energy
C. Internal energy
D. All (A), B. & (C) - The molar composition of a gas is 10% H2, 10% O2, 30% CO2 and balance H2O. If 50% H2O condenses, the final mole percent of H2 in the gas on a dry basis will be_______________?
A. 10%
B. 5%
C. 18.18%
D. 20% - Joule-Thomson co-efficient which is defined as, η = (∂T/∂P)H = 1/Cp (∂H/∂T)P, changes sign at a temperature known as inversion temperature. The value of Joule-Thomson co-efficient at inversion temperature is ___________________?
A. 0
B. ∞
C. +ve
D. -ve
Advertisement