Chemical Engineering MCQs

Page No. 545

In a chemical reaction, _____________________ are conserved?


aIons

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bMasses

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cAtoms

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dBoth B. & C.

✓


View Answer Both B. & C.

Sulphuric acid is used as a catalyst in the_______________?


aHydrogenation of oils

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bGas phase oxidation of SO2 in chamber process

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cAlkylation of hydrocarbons

✓


dNone of these

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An autothermal reactor is_________________?


aMost suitable for a second order reaction

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bMost suitable for a reversible reaction

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cCompletely self-supporting in its thermal energy requirements

✓


dIsothermal in nature

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Which of the following will favour the reverse reaction in a chemical equilibrium reaction ?


aIncreasing the concentration of one of the reactants

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bIncreasing the concentration of one or more of the products

✓


cRemoval of at least one of the products at regular interval

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dNone of these

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For a vapour phase catalytic reaction (A + B → P) which follows the Ridel mechanism and the reaction step is rate controlling, the rate of reaction is given by (reaction rate is irreversible, product also absorbs) ?


a-rA = (k . PA . PB)/(1 + KAPA + KPPP)

✓


b-rA = (k . PA

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c– k1PP)/(1 + KAPA + KPPP)

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d-rA = (k . PA . PB)/(1 + KAPB + KBPB . KPPP)

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At a given temperature, K1, K2 and K3 are equilibrium constants for the following reactions 1, 2, 3 respectively. CH4(g) + H2O(g) ⇌ CO(g) + 3H2(g), CO(g) + H2O(g) ⇌ CO2(g) + H2(g) CH4(g) + 2H2O(g) ⇌ CO2(g) + 4H2(g) Then K1, K2 and K3 are related as ?


aK3 = K1.K2

✓


bK3 = (K1.K2)0.5

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cK3(K1+K2)/2

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dK3 = (K1.K2)2

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View Answer K3 = K1.K2

For reactions in parallel viz A → P (desired product) and A → Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a_________________?


aBatch reactor is preferred over a single CSTR for high yield

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bTubular reactor is preferred over a single CSTR for high yield

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cBoth A. and B.

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dSingle CSTR is the most suitable

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View Answer Both A. and B.

A first order reaction requires two unequal sized CSTR. Which of the following gives higher yield ?


aLarge reactor followed by smaller one

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bSmaller reactor followed by larger one

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cEither of the arrangement A. or B. will give the same yield

✓


dData insufficient, can’t be predicted

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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 from 10 to 100°C?


a256

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b512

✓


c112

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d612

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View Answer 512

For the liquid phase zero order irreversible reaction A → B, the conversion of A in a CSTR is found to be 0.3 at a space velocity of 0.1min-1. What will be the conversion for a PFR with a space velocity of 0.2 min-1? Assume that all the other operating conditions are the same for CSTR and PFR ?


a0.15

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b0.30

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c0.60

✓


d0.90

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View Answer 0.60

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