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1.

A substance is found to contain 7 % nitrogen. The minimum molecular weight of it, isA. 700B. 100C. 200D. 70

Answer» Correct Answer - C
Atomic weight of nitrogen is 14. If one atom of nitrogen is present in compound, then it should have molecular weight `= (14)/(7)xx100 = 200`
Discussion
2.

If `0.765 g` of an acid gives `0.535 g` of `CO_(2)` and `0.138 g` of `H_(2)O`, then the ratio of the percentage of `C` to `H` isA. `19 :2`B. `18:11`C. `20:17`D. `1:7`

Answer» Correct Answer - A
`%` of `C=(12)/(44)xx(0.535)/(0.765)xx100=18.07`
`%` of `H=(1)/(18)xx(0.138)/(0.765)xx100=2.004`
Ratio of `%` of `C , H = 19 :2` (approx)
Discussion