Question

# If a sample of $$MgBr_2$$ contains $$4\times 10^{20} Br^-$$ ions, then the number of $$Mg^{2+}$$ ions present in it is:

A
4×1020
B
8×1020
C
2×1020
D
1×1020

Solution

## The correct option is D $$2 \times 10^{20}$$correct answer: option 'C'$$MgBr_2\rightarrow Mg^{2+} +2Br^-$$Explanation: because the number of $$Mg^{2+}$$ ions are half of $$Br^-$$ ions. Therefore option 'C' is the correct answerChemistry

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