Which of the following is a controlling factor in very fast heterogeneous reaction?

For a heterogeneous catalytic reaction

A

Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction

B

A relatively small amount of catalyst can cause the conversion of large amount of reactants which does not mean that catalyst concentration is important

C

The catalyst does not form an intermediate complex with the reactant

D

The surface of the catalyst does not play an important role during reaction

Which one is the rate controlling step in a solid-gas non-catalytic reaction occurring at very high temperature?

A

Pore diffusion

B

Film diffusion

C

Ash layer diffusion

D

Chemical reaction

If a solid-gas non-catalytic reaction occurs at very high temperature, the rate controlling step is the __________ diffusion.

A

Film

B

Ash layer

C

Pore

D

None of these

He kept the fast for a week এখানে fast শব্দটি

A

Noun

B

Pronoun

C

Adjective

D

Adverb

Muslims fast during Ramadan, here fast is-

A

adjective

B

adverb

C

verb

D

determiner

The word 'fast' in the sentence --'The deadline was fast approaching', is a/an :

A

verb

B

noun

C

adjective

D

adverd

Bashar is twice as fast as Arif and Karim is three times as fast as Arif. If Bashar alone can complete a job in 12 days, how long will Bashar, Arif and Karim take to complete the same job together ?

A

3 days

B

4 days

C

6 days

D

8 days

He runs fast. The word 'fast' here is ----

A

a verb

B

an adjective

C

an adverb

D

a conjunction

'He runs fast', here the word 'fast' is a/an---

A

adverb

B

pronoun

C

noun

D

adjective

A horse runs fast. ___ In this sentence 'fast' is ___

A

verb

B

adjective

C

adverb

D

noun

Which of the following is a controlling factor in very fast heterogeneous reaction?

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