A photochemical reaction is __________ light.

A photochemical reaction is

A

Accompanied with emission of light

B

Catalysed by light

C

Initiated by light

D

All of the above

Photochemical reaction rate does not depend significantly on temperature, because

A

It is a reversible reaction

B

It is an exothermic reaction

C

The energy of reacting molecules exceeds the activation energy by absorption of light

D

None of these

নিম্নলিখিত কোন গ্যাস photochemical ধোয়াসার (smog) জন্য দায়ী নয়?

A

Hydrocarbon

B

O3

C

NO2

D

CFC

Which of the following pollutants is the major contributor to photochemical smog?

A

Peroxynitrates

B

Hydroperoxides

C

Nitrogen dioxide

D

Ozone

Which of the following group of gases cause photochemical smog?

A

Ozone, PAN and CO

B

HC, NO and PAN

C

O₂, PAN, and NO₂

D

O₃, PAN and NO₂

In a photochemical smog, which gas is an eye and mucous membrane irritant?

A

SO₂

B

O₃

C

CO₂

D

N₂O

Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog?

A

Nitrogen oxides

B

Hydrocarbons

C

Both A & B

D

Carbon monoxide

Photochemical smog is formed from automobile exhaust

A

By reaction of hydrocarbon & nitric oxide in presence of sunlight

B

Appears only on sunny days

C

Is harmful for crops and trees also besides causing eye irritation & asthma

D

All of the above

Chlorination of benzene is done to produce benzene hexachloride (a pesticide) in a photochemical reactor lined with

A

Karbate

B

Lead or glass

C

Fireclay bricks

D

PVC

Overall rate of reaction in a heterogenous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually __________ the concentration of catalyst, if it does not entail a chain mechanism.

A

Proportional to

B

Independent of

C

Inversely proportional to

D

Proportional to the square of

A photochemical reaction is __________ light.

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