Acid rain is caused by the pollution of environment by _____.

With reference to the usefulness of the by-products of sugar industry, which of the following statements is/are correct?

1. Bagasse can be used as biomass fuel for the generation of energy.
2. Molasses can be used as one of the feedstocks for the production of synthetic chemical fertilisers.
3. Molasses can be used for the production of ethanol.
Select the correct answer using the codes given below:

Fruits stored in a cold chamber exhibit longer storage life because _____.

Which of the following are some important pollutants released by steel industry in India?

1. Oxides of sulphur

2. Oxides of nitrogen

3. Carbon monoxide

4. Carbon dioxide

Select the correct answer using the codes given below:

There is some concern regarding the nano particles of some chemical elements that are used by the industry in the manufacture of various products. Why?

1. They can accumulate in the environment and contaminate water and soil.
2. They can enter the food chains.
3. They can trigger the production of free radicals.
Select the correct answer using the codes given below:

With reference to two non-conventional energy sources called ‘coalbed methane’ and ‘shale gas’, consider the following statements :

1. Coalbed methane is the pure methane gas extracted from coal seams, while shale gas is a mixture of propane and butane only that can be extracted from fine-grained sedimentary rocks.

2. In India, abundant coalbed methane sources exist, but so far no shale gas sources have been found.

Which of the statement(s) given above is/are correct?

Consider the following pairs :

Which of the pairs given above is/are correctly matched?