19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Assertion (A): London smog is oxidising in nature. Reason (R): London smog contains O3, NO2 and hydrocarbons. (AIIMS2009)
5L aqueous solution is kept in the presence of oxygen and suitable microorganism for five days at 20°C. If the O2 consumed is 0.2g, the BOD value of the sample is (EAMCET 2008)
The process of ‘eutrophication’ is due to the (Kerala CEE 2008)
Freon gas causing stratospheric ozone depletion is mainly released from : (WB CET 2008)
Green chemistry means such reactions which : (AIPMT 2008)
Which one of the following compounds helps in achieving equilibrium between O2 and CO2 in atmosphere? (EAMCET 2008)
The brown haze of photochemical smog is largely attributable to (Punjab PMET 2007)
Which of the following is secondary pollutant? (Manipal 2007)
Match the column I and column II and pick the correct matching from the codes given below. (Kerala CEE 2006) Column I Column II A. Peroxyacetyl nitrate 1. Waste incineration B. Polycylic aromatic 2. Global warming C…
The water pollutants mainly responsible for eutrophication are (Punjab PMET 2006)
Use of chlorofluorocarbon is not encouraged because (KCET 2005)
The basic components of the smog are (AMU 2005)
The smog is essentially caused by the presence of : [Guj. CET 2004]
Nitrogen oxides produced from the presence of (KET 2004)
Which one of the following is responsible for depletion of the ozone layer in the upper strata of the atmosphere? (AIPMT 2004)
Biological Oxygen Demand (BOD) is a measure of (AIIMS 2003)
When rain is accompanied by a thunderstorm, the collected rain water will have a pH value (AIEEE 2003)
Greenhouse effect is caused by: (AIPMT 2002, AFMC 2002)
Phosphate pollution is brought about by (AIPMT 1997)
…A… of pollution are those where a source of pollution cannot be identified. Here, A refers to :
Which of the following is most essential for life?
‘Good ozone’ is found in the
Match the Column I with the Column II and choose the correct option from the codes given below. Column I Column II A. Nuclear power plant B. Burning of fossil fuel C. Solar energy 1. Radioactive wastes 2. Release of …
CO emitted automobiles prevents O2-transport to body tissues by:
Match the terms given in Column I with the compounds given in Column II and choose the correct option from the codes given below. Column I Column II A. Acid rain B. Photochemical smog C. Combination with haemoglobin…