Chemical Reaction | Test For NTS PPSC FPSC, TEST

Pick out the correct statement?

A. A lower temperature favours the reaction of lower activation energy
B. The dispersion number for a reactor/vessel is uL/D
C. The rate controlling step in a reaction involving many steps is the fastest step
D. Pore volume and porosity of a catalyst is measured by Brunauer-Emmett-Teller (BET)
technique

Pick out the wrong statement?

A. Catalytic activity of enzyme catalysed reactions which is affected by temperature, pH value &
chemical agents, is maximum at a temperature of about 45°C
B. Most of the enzyme catalysed reactions involve at least two substrates
C. Enzymes help in increasing the activation energy of the reaction
D. Equilibrium concentrations in enzyme catalysed reactions can be calculated by using the
thermodynamic properties of substrates & products

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Category: Chemical Reaction

When the reaction is dominated by intraparticle diffusion, the apparent order of reaction (nD) as measured is related to the true order (n) as ________________?

In solid catalysed reactions the diffusional effects are more likely to affect the overall rate of reaction for________________?

Pick out the correct statement?

The rate of a gas phase reaction is given by K . CA . CB. If the volume of the reaction vessel is reduced to l/4th of its initial volume, then the reaction rate compared to the original rate will be _______________ times?

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 ___________________?

Pick out the wrong statement?

A rise in temperature ______________________?

The rate equation for the reaction represented by as shown in the bellow figure, is given by – rx = K1 . Cx/(1 + K2 Cx). At high value of Cx (i.e.., K2Cx > > 1), the order of the reaction and the rate constant are respectively___________________?

______________ is the response curve for a step input signal from a reactor ?

The preferred reacting system for oxidation of o-xylene to phthalic anhydride is _____________________?