19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Assertion :Gases do not liquefy above their critical temperature, whatever the high pressure is applied. Reason :Above critical temperature, molecular speed is high and intermolecular force cannot hold the molecules t…
Assertion :Above critical temperature liquid state cannot be observed. Reason :Above critical temperature, the average kinetic energy of a molecule is always greater than the maximum kinetic energy a molecule can poss…
Ozone is an important constituent of stratosphere because it
Formation of London smog takes place in
Which of the following chemical, harmful to ozone, is released by chlorofluoro carbon
Which of the following acts as a sink for CO?
Ozone layer of stratosphere requires protection from indiscriminate use of
The non-viable particulate among the following is
Which of the following causes lung cancer
The false statement among the following is :
Phosphate pollution is caused by
Phosphate fertilizers when added to water leads to
Eutrophication causes reduction in
BOD is connected with
Water is often treated with chlorine to
The type of pollution caused by spraying of DDT
Which is true about DDT
The substance which is a primary pollutant?
The greenhouse effect is caused by
The greatest affinity for haemoglobin is shown by which of the following
The substance having the largest concentration in acid rain?
Which of the following statement is false?
The aromatic compounds present as particulates are
Which of the following is not involved in the formation of photochemical smog?
Which forms the part of hazy fumes of photochemical smog