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Solution


Q.

Read the passage carefully and answer the following questions from (i) to (v):

As a versatile element, carbon can form large compounds because of its tetravalency and the property of catenation that it exhibits. Here, catenation refers to the combination of carbon atoms itself to form large molecules. Carbon forms stronger covalent bonds with itself and other elements such as hydrogen, oxygen, sulphur, nitrogen and chlorine. This is because its nucleus has a strong force of attraction and holds these bonds tightly together.

 

 

(iii) Which of the following puts the elements in the right order in terms of their valency, starting with the element of lowest valency
1 O, C, N, H  
2 C, O, N, H  
3 H, C, O, N  
4 H, O, N, C  

Ans.

(4)