### Related Questions

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# Compound having large heat of formation is

C. Not at all stable (like nascent O2)

D. Either more or less stable; depends on the compound

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# Which of the following behaves most closely like an ideal gas?

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# Throttling process is a/an __________ process.

A. Reversible and isothermal

B. Irreversible and constant enthalpy

C. Reversible and constant entropy

D. Reversible and constant enthalpy

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# The fugacity of a gas in a mixture is equal to the product of its mole fraction and its fugacity in the pure state at the total pressure of the mixture. This is

A. The statement as per Gibbs-Helmholtz

B. Called Lewis-Randall rule

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# Normal temperature and pressure (N.T.P.) corresponds to

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# A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect?

A. Vapor compression cycle using expansion valve

B. Air refrigeration cycle

C. Vapor compression cycle using expansion engine

D. Carnot refrigeration cycle

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# The change in __________ is equal to the reversible work for compression in steady state flow process under isothermal condition.

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# Pick out the undesirable property for a good refrigerant.

A. High thermal conductivity

C. Large latent heat of vaporisation

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# Which one is true for a throttling process?

A. A gas may have more than one inversion temperatures

B. The inversion temperature is different for different gases

C. The inversion temperature is same for all gases

D. The inversion temperature is the temperature at which Joule-Thomson co-efficient is infinity

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# Grams of butane (C_{4}H_{10}) formed by the liquefaction of 448 litres of the gas (measured at (STP) would be

D. Data insufficient; can't be computed

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# Claude's liquefaction process employs the cooling of gases by

A. Expansion in an engine

B. Following a constant pressure cycle

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# Clapeyron Equation deals with the

A. Rate of change of vapour pressure with temperature

B. Effect of an inert gas on vapour pressure

C. Calculation of ΔF for spontaneous phase change

D. Temperature dependence of heat of phase transition

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# Joule-Thomson Co-efficient at any point on the inversion curve is

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# Melting of ice exemplifies a/an

D. Process involving a chemical reaction

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# Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the

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# The partial molar enthalpy of a component in an ideal binary gas mixture of composition Z, at a temperature T and pressure P, is a function only of

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# In an isothermal process on an ideal gas, the pressure increases by 0.5 percent. The volume decreases by about __________ percent.

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# In an irreversible process

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# At 60° C, vapour pressure of methanol and water are 84.562 kPa and 19.953 kPa respectively. An aqueous solution of methanol at 60° C exerts a pressure of 39.223 kPa; the liquid phase and vapour phase mole fractions of methanol are 0.1686 and 0.5714 respectively. Activity co-efficient of methanol is

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# One ton of refrigeration capacity is equivalent to the heat removal rate of

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# For a multi-component system, the term chemical potential is equivalent to the

A. Molal concentration difference

C. Partial molar free energy

D. Molar free energy change

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# Boiling of liquid is accompanied with increase in the

B. Specific Gibbs free energy

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# When dilute aqueous solutions of two salts are mixed, the process is associated with

A. Decrease in temperature

B. Increase in temperature

C. No change in temperature

D. Change in temperature which is a function of composition

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# The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called the __________ temperature.

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# 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

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# For a constant volume process

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# Heat is added at constant temperature in an ideal __________ cycle.

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# Compressibility factor of a gas is

A. Not a function of its pressure

B. Not a function of its nature

C. Not a function of its temperature

D. Unity, if it follows PV = nRT

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# Enthalpy 'H' is defined as

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# During adiabatic expansion of gas

A. Pressure remains constant

C. Temperature remains constant