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Solution


Q.

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

 

Balanced chemical equation has an equal number of atoms of different elements in the reactants and products. According to law of conservation of mass, matter can neither be created nor be destroyed in a chemical reaction.

 

(iii) When the powder of a common metal is heated in an open china dish, its colour turns black. However, when hydrogen is passed over the hot black substance so formed, it regains its original colour. What type of chemical reaction takes place in each of the two given steps
1 First oxidation reaction then displacement reaction  
2 First combustion reaction, then reduction reaction  
3 First oxidation reaction, then redox reaction  
4 First reduction reaction, then redox reaction  

Ans.

(3)

First oxidation reaction, then redox reaction