HSC Science Class 11 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Chemistry

Photo chemical smog formed in congested metropolitan cities mainly consists of ______.

The pH of normal rain water is ______.

Living in the atmosphere of CO is dangerous because it ______.

Release of oxides of nitrogen and hydrocarbons into the atmosphere by motor vehicles is prevented by using ______.

Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be ______.

Match the List I with List II and select the correct answer using the code given below the lists.

Assertion (A): If BOD level of water in a reservoir is more than 5 ppm it is highly polluted.

Reason(R): High biological oxygen demand means high activity of bacteria in water.

What would happen, if the greenhouse gases were totally missing in the earth’s atmosphere?

Define smog.

From where does ozone come in the photo chemical smog?

A person was using water supplied by corporation. Due to shortage of water he started using underground water. He felt laxative effect. What could be the cause?

Explain how does greenhouse effect cause global warming.

How does classical smog differ from photochemical smog?

What are particulate pollutants? Explain any three.

Ethane bums completely in air to give CO₂. while in a limited supply of air gives CO. The same gases are found in automobile exhaust. Both CO and CO₂ are atmospheric pollutants

1. What is the danger associated with these gases?
2. How do the pollutants affect the human body?

How is acid rain formed?

Explain the effects of acid rain.

Differentiate the following:

BOD and COD

Differentiate the following:

Viable and non-viable particulate pollutants

Explain how oxygen deficiency is caused by carbon monoxide in our blood? Give its effect.