MCQ
Soft heavy metal melts at ${30\,^o}C$ and is used in making heat sensitive thermometers the metal is
- ✓Galium
- BSodium
- CPotassium
- DCaesium
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Statement $I :$ Rutherford's gold foil experiment cannot explain the line spectrum of hydrogen atom.
Statement $II :$ Bohr'smodel of hydrogen atom contradicts Heisenberg's uncertainty principle.
In the light of the above statements, choose the most appropriate answer from the options given below :
$(I)$ $Na_2O_2$
$(II)$ $O_2 [AsF_6]$
$(III)$ $CsO_2$
$(IV)$ $O_2$