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JEE Advance 2019
Paper 1
Question
Among $\mathrm{B}_2 \mathrm{H}_6, \mathrm{~B}_3 \mathrm{~N}_3 \mathrm{H}_6, \mathrm{~N}_2 \mathrm{O}, \mathrm{N}_2 \mathrm{O}_4, \mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_3$ and $\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8$, the total number of molecules containing covalent bond between two atoms of the same kind is $\_\_\_\_$
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