In compounds, different elements of matter, like atoms and ions, combine together in
A
Fixed proportions
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B
Irregular proportions
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C
Unequal ratios
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D
Both a and b
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Solution
The correct option is B Fixed proportions A compound is the chemical union of separate elements, ingredients, or parts. It is when the different elements of matter, like atoms and ions, combine together in fixed proportions (law of definite proportions). Option A is correct.