Chemical Reaction Engineering
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.

Less than
Same as
More than
Data insufficient; can't be predicted

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Chemical Reaction Engineering
The reactions of high molecularity are rare, because

Of low probability of many body collisions
Of very large activation energy of many bodies
Many body collisions are not favoured energetically
Of requirement of very large concentration for such reactions

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