MCQ
Which of the following has lowest first ionisation potential
- ✓$B$
- B$C$
- C$N$
- D$O$
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$Cr _2 O _7^{2-}+ XH ^{+}+6 Fe ^{2+} \rightarrow YCr ^{3+}+6 Fe ^{3+}+ ZH _2 O$
The sum of $X . Y$ and $Z$ is $.......$.