19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which one of the following compounds helps in achieving equilibrium between O2 and CO2 in atmosphere? (EAMCET 2008)
Green chemistry means such reactions which : (AIPMT 2008)
Freon gas causing stratospheric ozone depletion is mainly released from : (WB CET 2008)
The process of ‘eutrophication’ is due to the (Kerala CEE 2008)
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)
Assertion (A): London smog is oxidising in nature. Reason (R): London smog contains O3, NO2 and hydrocarbons. (AIIMS2009)
Photochemical smog is caused due to the presence of (Kerala CEE2009)
Antidote for carbon monoxide is/are (CG PMT, Haryana PMT 2009)
DDT residues are rapidly passed through food chain causing biomagnification because DDT is (AIPMT 2009)
The chemical entities present in thermosphere of the atmosphere (EAMCET 2009) (a)O2 +, O+, NO+
Pollution is (MHT CET 2010)
UV radiations brings about (RPMT 2010)
Gas released during Bhopal Gas Tragedy was (RPMT 2010)
Global warming can be controlled by : (CBSE-AIPMT 2010)
Greenhouse effect is caused by (JCECE2010)
Identify the incorrect statement from the following. (AIEEE 2011)
‘Good ozone’ is found in the (AIPMT Mains 2011)
Which of the following statements is not true ? (AIPMT 2011)
Excess nitrate in drinking water can cause (Kerala CEE 2011)
Eutrophication is due to (AMU 2011) (a) SO ion present in water
Photochemical smog is caused by light mediated reaction between : (AIPMT 2012)
Which one of the following statements regarding photochemical smog is not correct? (CBSE, AIPMT 2012)
BOD stands for (AMU 2012)
Assertion (A): CO and NO combine with haemoglobin. Reason (R): Both have equal affinity for haemoglobin. (AIIMS 2012)
Which one of the following statements is not true? (Karnataka NEET 2013)