Discuss measures for the control of pollution problems with spec

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsLong Answer Type

241. How will you convert benzene into:
(i) p-Nitrobromobenzene
(ii) m-Nitrochlorobenzene
(iii) p-Nitrotoluene
(iv) Acetophenone?


657 Views

 Multiple Choice QuestionsShort Answer Type

242.

Out of benzene, m-dinitrobenzene and toluene which will undergo nitration most easily and why?

363 Views

243.

How will you explain the directive influence of alkyl group (in the case of toluene)?

212 Views

244.

How will you explain the directive influence of –NH2 group (in the case of aniline)?

233 Views

Advertisement
245.

How will you explain the directive influence of -CHO group?

165 Views

246.

How will you explain the directive influence of halogens?

187 Views

247.

Arrange the following set of compounds in order of their decreasing relative reactivity with an electrophile E+:

(a) Chlorobenzene; 2, 4-dinitrochlorobenzene, p- nitro chlorobenzene

(b) Toluene, p-H3C – C6H4 – NO2, p-O2N – C6H4 – NO2
268 Views

 Multiple Choice QuestionsLong Answer Type

248.

What are polynuclear hydrocarbons? Discuss the toxicity of polynuclear hydrocarbons.

319 Views

Advertisement

 Multiple Choice QuestionsShort Answer Type

249.

What is liquified petroleum gas (L.P.G.)?

155 Views

 Multiple Choice QuestionsLong Answer Type

Advertisement

250.

Discuss measures for the control of pollution problems with special reference to the use of C.N.G.


The engine of an automobile discharges a large number of gaseous substances into the atmosphere which includes carbon monoxide, carbon dioxide, water vapours, oxides of nitrogen (NOx), unburnt hydrocarbons and also certain compounds of lead if leaded petrol is used. Some of these compounds are highly poisonous such as compounds of lead. In order to check this, the automobiles are filled with catalytic converters to oxidise these harmful hydrocarbons to CO2, and H2O.

Now a days, use of C.N.G. (compressed natural gas), liquified petroleum gas (L.P.G.) and liquefied hydrogen gas (L.H.G.) have been tested in metropolitan cities. C.N.G. is mainly a mixture of methane and ethane and a small amount of propane. C.N.G. is normally found to be associated with crude petroleum. It is compressed and stored in cylinders. Its combustion is almost complete and no poisonous vapours are released in the environment. However, special types of engines have to be filled in the vehicles where C.N.G. is used. C.N.G. is quite successful in controlling air pollution.

149 Views

Advertisement
Advertisement