'Unreacted core model' represents the reaction involving

In chamber process of sulphuric acid manufacture in industry, the gas phase oxidation of SO₂ to SO₃ is accomplished by a __________ reaction.

For the irreversible elementary reactions in parallel viz , the rate of disappearance of 'X' is equal to

For a reaction of the type, , the rate of reaction (- r_x) is given by

A chemical reaction occurs when the energy of the reacting molecules is __________ the activation energy of the reaction.

If the rate of a chemical reaction becomes slower at a given temperature, then the

B.E.T. method can be used to determine the __________ of a porous catalyst.

The conversion X_A and residence time data are collected for zero order liquid phase reaction in a stirred tank reactor. Which of the following will be a straight line ?

Exposure of a photographic plate to produce a latent image is an example of __________ reaction.

For a series of reactions having k₁ << k₂, the reaction system can be approximated as

Given,
3H₂ + CO = CH₄ + H₂O, K_P = 10^1.84 and,
4H₂ + CO₂ = CH₄ + 2H₂O, K_P = 10^1.17
the K_P for the reaction CO + H₂O = CO₂ + H₂ is

Space velocity

For identical flow rate, feed composition and for elementary first order reactions, 'N' equal sized mixed reactors in series with a total volume 'V' gives the same conversion as a single plug flow reactor of volume 'V' for constant density systems. This is true, when the value of 'N' is

Helium-mercury method is used for the measurement of the __________ of the catalyst.

What is the order of a chemical reaction whose rate is deter-mined by the variation of one concentration term only ?

The rate of the reaction, X Y, quadruples when the concentration of 'X' is doubled. The rate expression for the reaction is, r = K C_xⁿ, the value of 'n' in this case will be

In case of the irreversible unimolecular type, first order reaction, the fractional conversion at any time for constant volume system as compared to variable volume system is

The reaction in which the rate equation corresponds to a stoichiometric equation, is called a/an __________ reaction.

Photochemical reaction rate does not depend significantly on temperature, because

A reaction which is catalysed by a base is catalysed by all substances which have a tendency to

A reaction which is catalysed by a base is catalysed by all substances which have a tendency to

Pick out the wrong statement.

Which of the following resistances is not involved in a gas phase catalytic (gas-solid) reaction ?

Pick out the wrong statement.

The optimum performance for reactors operating in parallel is obtained when the feed stream is distributed in such a way, that the

According to the 'law of mass action', the rate of reaction is directly proportional to the

Pick out the wrong statement.

For a homogeneous reaction of nth order, the dimension of the rate constant is given by

If the time required to change the concentration of reactant to half its original value is independent of the initial concentration, the order of reaction is

There is no correspondence between stoichiometry and the rate equation in case of a/an __________ reaction.

A catalyst is said to be a negative catalyst, ifit

In a chemical reaction, __________ are conserved.

The reaction A B is conducted in an isothermal batch reactor. If the conversion of A increases linearly with holding time, then the order of the reaction is

In a chemical reaction, __________ are conserved.

Which of the following is used for calcination of limestone and dolomite in industrial practice ?

For the non catalytic reaction of particles with surrounding fluid, the same needed to achive the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the __________ is the controlling resistance.

For an ideal gas mixture undergoing a reversible gaseous phase chemical reaction, the equilibrium constant

The fractional volume change between no conversion and complete conversion, for the isothermal gas phase reaction, 2A R, is

A photochemical reaction is

A photochemical reaction is

Which of the following is used for calcination of limestone and dolomite in industrial practice ?

Pure ethanol vapor is fed to a reactor packed with alumina catalyst, at the rate ofkmole / hr. The reactor products comprise: ethylene :kmole / hr, water vapour: 97.5 k mole / hr and diethyl ether :2.5 kmole/hr. The reactions occuring can be represented by:
C₂H₅OH C₂H₄ + H₂O
2C₂H₅OH C₂H₅ - O - C₂H₅ + H₂O
The percent conversion of ethanol in the reactor is

Pure ethanol vapor is fed to a reactor packed with alumina catalyst, at the rate ofkmole / hr. The reactor products comprise: ethylene :kmole / hr, water vapour: 97.5 k mole / hr and diethyl ether :2.5 kmole/hr. The reactions occuring can be represented by:
C₂H₅OH C₂H₄ + H₂O
2C₂H₅OH C₂H₅ - O - C₂H₅ + H₂O
The percent conversion of ethanol in the reactor is

A photochemical reaction is