Related Questions

The change in enthalpy, when a unit quantity of gas is absorbed by relatively large quantity of adsorbent (on which a definite concentration of the adsorbed gas already exists) is termed as the
A Differential heat of adsorption
B Heat of wetting
C Integral heat of adsorption
D None of these
During a reversible isothermal expansion of an ideal gas, the entropy change is
A +ve
B 0
C -ve
D ∞
The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is
A R loge 4
B R log10 4
C Cv log10 4
D Cv loge 4
High pressure steam is expanded adiabati-cally and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process:
A ΔH = 0 and ΔS = 0
B ΔH ≠ 0 and ΔS = 0
C ΔH ≠ 0 and ΔS ≠ 0
D ΔH = 0 and ΔS ≠ 0
The net heat evolved or absorbed in a chemical process, i.e. total change in the enthalpy of the system is independent of the
A Temperature & pressure
B Number of intermediate chemical reactions involved
C State of aggregation & the state of combination at the beginning & the end of the reaction
D None of these
In a refrigeration system, heat absorbed in comparison to heat rejected is
A More
B Less
C Same
D More for small capacity and less for high capacity
In a refrigerating machine, heat rejected is _________ heat absorbed.
A Equal to
B Less than
C Greater than
D None of these
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
Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of
A Fusion
B Vaporisation
C Transition
D None of these
The density of a gas 'X' is twice that of another gas 'Y'. If the molecular weight of gas 'Y' is 'M'; then the molecular weight of the gas 'X' will be
A 2M
B $$\frac{{\text{M}}}{2}$$
C M
D $$\frac{{\text{M}}}{4}$$

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