Science (English Medium) इयत्ता ११ - CBSE Question Bank Solutions for Chemistry

The gaseous envelope around the earth is known as atmosphere. The lowest layer of this is extended upto 10 km from sea level, this layer is ______.

The acids present in acid rain are:

(i) Peroxyacetylnitrate

(ii) H₂CO₃ 

(iii) HNO₃

(iv) H₂SO₄ 

Green house effect leads to global warming. Which substances are responsible for green house effect?

Acid rain is known to contain some acids. Name these acids and where from they come in rain?

Some time ago formation of polar stratospheric clouds was reported over Antarctica. Why were these formed? What happens when such clouds break up by warmth of sunlight?

Match the terms given in Column I with the compounds given in Column II.

Match the pollutant(s) in Column I with the effect(s) in Column II.

Match the pollutants given in Column I with their effects given in Column II.

Assertion (A): Green house effect was observed in houses used to grow plants and these are made of green glass.

Reason (R): Green house name has been given because glass houses are made of green glass.

Assertion (A): The pH of acid rain is less than 5.6.

Reason (R): Carbon dioxide present in the atmosphere dissolves in rain water and forms carbonic acid.

Assertion (A): Carbon dioxide is one of the important greenhouse gases.

Reason (R): It is largely produced by respiratory function of animals and plants.

Green plants use carbon dioxide for photosynthesis and return oxygen to the atmosphere, even then carbon dioxide is considered to be responsible for greenhouse effect. Explain why?

Explain how does greenhouse effect cause global warming.

Which of the following is a secondary pollutant?  

An alkene ‘A’ contains three C – C, eight C – H σ bonds and one C – C π bond. ‘A’ on ozonolysis gives two moles of an aldehyde of molar mass 44 u. Write IUPAC name of ‘A’.

What is the basic difference in approach between the Mendeleev’s Periodic Law and the Modern Periodic Law?

On the basis of quantum numbers, justify that the sixth period of the periodic table should have 32 elements.

In the modern periodic table, the period indicates the value of:-

Which of the following statements related to the modern periodic table is incorrect?

The skeletal structure of CH₃COOH as shown below is correct, but some of the bonds are shown incorrectly. Write the correct Lewis structure for acetic acid.