Q.1
The most unsuitable reactor for carrying out reactions in which high reactant concentration favours high yields is
Q.2
The rate of a chemical reaction is almost doubled for every 10°C rise in temperature. The rate will increase __________ times, if the temperature rises form 10 to 100°C.
Q.3
Enzymes (a protein) are catalysts found in organisms. Its efficiency of catalysing a reaction is due to its capacity to lower the activation energy of the reaction. The enzyme ptyalin used for food digestion is present in
Q.4
In case of physical adsorption, the heat of adsorption is of the order of __________ kcal/kg.mole.
Q.5
Which of the following does not produce a change in the value of rate constant of a reaction?
Q.6
As the chemical reaction proceeds, the rate of reaction
Q.7
Promoter.
Q.8
__________ is the response curve for a step input signal from a reactor.
Q.9
The conversion in a mixed reactor/accomplishing a reaction A 3R is 50% when gaseous reactant 'A' is introduced at the rate of 1 litre/second and the leaving flow rate is 2 litres/second. The holding time for this operation is __________ second.
Q.10
In the hydrodealkylation of toluene to benzene, the following reactions occur:
C₇H₈ + H₂ → C₆H₆ + CH₄
2C₆H₆ ⇋ C₁₂H₁₀ + H₂
Toluene and hydrogen are fed to a reactor in a molar ratio 1:5.80% of the toluene gets converted and the selectivity of benzene(defined as moles of benzene formed/moles of toluene converted) is 90%. The fractional conversion of hydrogen is
Q.11
Half-life period for a first order reaction is __________ the initial concentration of the reactant.
Q.12
The rate constant of a chemical reaction increases by increasing the
Q.13
Knudsen diffusion is directly proportional to
Q.14
BET apparatus is used to determine the
Q.15
The sequence in which three CSTR's of volumes 5, 10 and 15 m³ will be connected in series to obtain the maximum production in a second order irreversible reaction is
Q.16
For a gaseous phase reaction, rate of reaction is equal to K. CA . CB. If the volume of the reactor is suddenly reduced to l/4th of its initial volume, then the rate of reaction compared to the original rate will be __________ times.
Q.17
A balanced chemical reaction equation conforms to the law of
Q.18
N' plug flow reactors in series with a total volume 'V' gives the same conversion as a single plug flow reactor of volume 'V' for __________ order reactions.
Q.19
Pick out the wrong statement.
Q.20
Pick out the wrong statement.
Q.21
What is the order of a chemical reaction whose rate is deter-mined by the variation of one concentration term only?
Q.22
Which of the following curves shows the effect of temperature on the extent of gas-solid adsorption at a given pressure?
Q.23
Transition state theory gives the rate constant as
Q.24
Pure A in gas phase enters a reactor 50% of this A is converted to B through the reaction, A 3B. Mole fraction of A in the exit stream is
Q.25
For a solid catalysed chemical reaction, the effectiveness of solid catalyst depends upon the __________ adsorption.
Q.26
When a catalyst increases the rate of forward reaction, the value of rate constant
Q.27
Pick out the wrong statement.
Q.28
A plug-flow reactor is characterised by
Q.29
Pick out the correct statement
Q.30
In a CSTR __________ varies with time.
Q.31
Pick out the wrong statement.
Q.32
With the same reaction time, initial concentration and feed rate, the reaction 2A → B is carried out separately in CSTR and P.F. reactor of equal volumes. The conversion will be
Q.33
The fractional volume change of the system for the isothermal gas phase reaction, A 3B , between no conversion and complete conversion is
Q.34
The irreversible reaction is a special case of reversible reaction, if the
Q.35
Effectiveness factor of a catalyst pellet is a measure of the __________ resistance.
Q.36
In which of the following gaseous phase reversible reactions, the product yield can not be increased by the application of high pressure?
Q.37
The excess energy of the reactants required to dissociate into products is known as the __________ energy.
Q.38
The rate constant of a chemical reaction decreases by decreasing the
Q.39
Calcination reaction of limestone (CaCO₃ → CaO + CO₂) goes to completion in the rotary kiln, because
Q.40
In a first order reaction, the time required to reduce the concentration of reactant from 1 mole/litre to 0.5 mole/litre will be __________ that required to reduce it from 10 moles/litre to 5 moles/litre in the same volume.
Q.41
A first order reaction requires two unequal sized CSTR. Which of the following gives higher yield ?
Q.42
Enzymes are destroyed, when the
Q.43
B.E.T. method of finding out surface area of a catalyst, uses the extension of __________ isotherm.
Q.44
Which of the following is the most suitable for very high pressure gas phase reaction?
Q.45
Considering the endotheomic dissociation of CaCO₃ in a closed vessel (CaCO₃ ⇋ CaO + CO₂), the pressure of CO₂ increases, if
Q.46
Radioactive decay follows __________ order kinetics.
Q.47
For every 10°C rise in temperature, the rate of chemical reaction doubles. When the temperature is increased from 30 to 70°C, the rate of reaction increases __________ times.
Q.48
For a tubular reactor with space time 'τ' and residence time 'θ', the following statement holds good.
Q.49
A catalyst is said to be a negative catalyst, ifit
Q.50
For a zero order chemical reaction, the
0 h : 0 m : 1 s