Related Questions

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
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
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
Effectiveness factor (E) of a catalyst pellet is defined as, E = (actual rate within pore of catalyst/rate if notsnowed by pore diffusion) Effectiveness factor for a first order reaction is given by (where, T = Thiele modulus)
A Tan hT/T
B Tan T/T
C Tan hT/tan T
D None of these
Overall rate of reaction in a heterogenous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually __________ the concentration of catalyst, if it does not entail a chain mechanism.
A Proportional to
B Independent of
C Inversely proportional to
D Proportional to the square of
A reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction.
A Catalytic
B Autocatalytic
C Photochemical
D None of these
The reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction.
A Biochemical
B Photochemical
C Catalytic
D Autocatalytic
The equilibrium constant of a catalytic chemical reaction __________ due to the presence of a catalyst.
A Increases
B Decreases
C Remains unaffected
D Unpredictable from the data
The equilibrium constant of chemical reaction __________ in the presence of catalyst.
A Increases
B Decreases
C Remains unaffected
D Can either increase or decrease (depends on the type of catalyst)
Heat requirement for decomposition of a compound into its elements is __________ that is evolved during the formation of that compound from its elements.
A The same
B Less than
C Greater than
D Different than

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