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Solution


Q.

Which law should be kept in mind while we balance chemical equations
1 Conservation of momentum  
2 Conservation of mass  
3 Conservation of energy  
4 Conservation of frequency  

Ans.

(2)

The law of conservation of mass states that “mass can neither be created nor destroyed.” So, both the sides of the chemical reactions have to be balanced to ensure that this law is followed and thus the number of the reactant and the product molecules remains the same on both sides of the equation.