Q.

A chemical reaction is always balanced with respective to which one of the following                            (i)  Number of atoms     (ii)  Number of molecules                                                           (iii) Number of moles              (iv) Mass

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a

Only (i) is correct

b

Only (iii) is correct

c

Only (iv) is correct

d

Both (i) and (iv) are correct

answer is D.

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law of conversation of mass
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A chemical reaction is always balanced with respective to which one of the following                            (i)  Number of atoms     (ii)  Number of molecules                                                           (iii) Number of moles              (iv) Mass