Chemical Reaction

The rate at which a chemical substance reacts is proportional to its _____________________?

Byadmin February 23, 2019August 23, 2021

The rate at which a chemical substance reacts is proportional to its _____________________?

A. Active mass
B. Molecular weight
C. Equivalent weight
D. Atomic weight

Chemical Reaction

In an exothermic chemical reaction, the reactants compared to the products have__________________?

In an exothermic chemical reaction, the reactants compared to the products have__________________?

A. Higher temperature
B. More energy
C. Less energy
D. Same energy

Read More In an exothermic chemical reaction, the reactants compared to the products have__________________?
Chemical Reaction

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 __________________?

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 __________________?

A. 0
B. 1
C. 1.5
D. 2

Read More 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 __________________?
Chemical Reaction

Which of the following is not a dimension-less group used in catalysis? (Where, D = dispersion co-efficient, cm2/sec.D1 = diffusion co-efficient; cm2/sec L = length of the reactor, cm t = time, sec, v = volumetric flow rate, cm3/sec. V = volume, cm3.) ?

Which of the following is not a dimension-less group used in catalysis? (Where, D = dispersion co-efficient, cm2/sec.D1 = diffusion co-efficient; cm2/sec L = length of the reactor, cm t = time, sec, v = volumetric flow rate, cm3/sec. V = volume, cm3.) ?

A. Reactor dispersion number (D/vL)
B. Reduced time (vt/V)
C. Thiele modulus L √(k/D1)
D. None of these

Read More Which of the following is not a dimension-less group used in catalysis? (Where, D = dispersion co-efficient, cm2/sec.D1 = diffusion co-efficient; cm2/sec L = length of the reactor, cm t = time, sec, v = volumetric flow rate, cm3/sec. V = volume, cm3.) ?
Chemical Reaction

A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by________________?

A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by________________?

A. keff = k + kg
B. keff = (k+ kg)/2
C. keff = (kkg)1/2
D. 1/keff = 1/k + 1/kg

Read More A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by________________?
Chemical Reaction

Enzymes are destroyed, when the_______________?

Enzymes are destroyed, when the_______________?

A. Temperature is very high
B. Reactant’s concentration is very high
C. Reactant’s concentration is very low
D. Reaction rate is independent of the reactant’s concentration

Read More Enzymes are destroyed, when the_______________?
Chemical Reaction

The effectiveness factor for large value of Thiele modulus [L√(K/D1)] of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D1 = diffusion co-efficient, cm2/second) ?

The effectiveness factor for large value of Thiele modulus [L√(K/D1)] of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D1 = diffusion co-efficient, cm2/second) ?

A. L √(K/D1)
B. 1/[L√(K/D1)]
C. 1
D. ∞

Read More The effectiveness factor for large value of Thiele modulus [L√(K/D1)] of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D1 = diffusion co-efficient, cm2/second) ?

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