Discolouration of 'Taj mahal' marbles is due to
Formation of photochemical smog
Oxidation of NO
The presence of chloroflurocarbons in atmosphere
Dissloution of CaCO3 by sulphuric acid
Q. Which of the followings pair is not present in acid rain (if any one acid in the given pair is not present, then that pair is considered to be not present)-
Q. When rain is accompanied by a thunderstorm, the collected rain water will have a pH value
- slightly higher than that when the thunderstorm is not there
- uninfluenced by occurrence of thunderstorm
- which depends on the amount of dust in air
- slightly lower than that of rain water withour thunderstorm
Q. Which one of the following statement s in not true?
- When the pH of rain water is higher than 6.5, it is called acid rain.
- Dissolved Oxygen (DO) in cold water can reach a concentration upto 10 ppm.
- Clean water would have a BOD value of 6 ppm.
- Fluoride deficiency in drinking water is harmful. Soluble fluoride is used to bring its concentration upto 1ppm.
What is the threshold below which, if the pH of rain water drops, it is called ‘acid rain’?
Q. Identify the pollutant gases which are responsible for the discolouration of marbles in the Taj Mahal.
- SO2 and NO2
- SO2 and O3
- CH4 and NO2
- O3 and CO2
Q. Which one of the gases is responsible for causing acid rain in atmosphere?
Statues and monuments in India are affected by acid rain. How?
Q. The acid other than sulphuric and nitric acid which may be present in acid rain are
- Hydrochloric acid
- Carbonic acid
- Phosphoric acid
- Hydrobromic acid
Q. Acid rain is produced by:
- excessive release of NO2 and SO2 in air
- excessive release of CO in air
- excessive release of SO2 and H2S in air
- excessive release of NH3 and CO2 in air