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Q.

In a compound, the constituent elements are combined in a definite proportion by


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a

Atomic number

b

Atomic mass

c

Valency

d

Coordination number 

answer is B.

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Detailed Solution

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In a compound, the constituent elements are combined in a definite proportion by atomic mass.
Compounds are made of elements always present in a definite proportion by mass. A compound is a substance formed when two or more chemical elements are bonded together in a fixed ratio. For example: Water, Hydrogen and Oxygen are present in the fixed mass ratio of 2:1.
 
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