From among the following, choose one which is not an exothermic process.

Which phase change is an example of an exothermic process?

A

Liquid to Solid

B

Gas to Solid

C

Gas to Liquid

D

All the above

Which of the following is a characteristic of an exothermic reaction?

A

Release of heat

B

Absorption of heat

C

Doesn't involve any change in temperature

D

None of the option is correct

Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor?

A

Temperature should be high in the beginning and decreased towards the end of the reaction

B

Very low temperature should be used throughout the reaction

C

Very high temperature should be used throughout the reaction

D

None of these

Which of the following is an exothermic reaction?

A

Conversion of graphite to diamond

B

Decomposition of water

C

Dehydrogenation of ethane to ethylene

D

None of these

Pick out the exothermic reaction out of the following:

A

C + H₂O = CO + H₂

B

CaC₂ + H₂O = Ca(OH)₂ + C₂H₂

C

MgCO₃ = MgO + CO₂

D

All of the above

Exothermic neutralisation reaction between caustic soda and dodecylbenzene sulphonic acid produces sodium dodecylbenzene sulphate, which is a/an

A

Explosive

B

Soap

C

Detergent

D

Analgesic drug

What is an exothermic reaction?

A

Reaction in which heat is released.

B

Reaction in which heat is absorbed.

C

Reaction in which neither heat is released nor absorbed.

D

None

In case of staged packed bed reactors carrying out exothermic reaction, use

A

High recycle for pure gas

B

Plug flow for dilute liquid requiring no large preheating of feed

C

Cold shot operations for a dilute solution requiring large preheating to bring the stream upto the reaction temperature

D

All of the above

In an exothermic chemical reaction, the reactants compared to the products have

A

Higher temperature

B

More energy

C

Less energy

D

Same energy

A typical example of an exothermic reversible reaction conducted at high pressure in industry is

A

Dehydration of ethanol

B

Methanol synthesis

C

Reformation of methane

D

Polymerisation of ethylene

From among the following, choose one which is not an exothermic process.

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