MCQ
Who developed the long form of the periodic table?
- ANiels Bohr.
- BMoseley.
- CMendeleef.
- DLothar Meyer.
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[Given: The threshold frequency of platinum is $1.3$ $\times 10^{15} \,s ^{-1}$ and $h =6.6 \times 10^{-34} \,J \,s$.]
$(a)$ $C{H_3} - \mathop C\limits^ \oplus H - C{H_3}$
$(b)$ $C{H_3} - \mathop C\limits^ \oplus H - OC{H_3}$
$(c)$ $C{H_3} - \mathop C\limits^ \oplus H - CO - C{H_3}$