MCQ
The main defect of Bohr's atom model is:
- AMixing of classical and quantum theories.
- BExclusion of nuclear motion.
- CFailed to explain the fine structure of spectral lines.
- DFailed to explain larger atoms.
Explanation:
Bohr's model can only clearly explain hydrogen or hydrogen-like atoms, it fails when applied to larger and heavier atoms like iron, gold, mercury, etc.
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|
List$-I$ (Metal Ion) |
List$-II$ (Group in Qualitative analysis) |
| $(a)$ ${Mn}^{2+}$ | $(i)$ Group $- III$ |
| $(b)$ ${A} {s}^{3+}$ | $(ii)$ Group $- IIA$ |
| $(c)$ ${Cu}^{2+}$ | $(iii)$ Group $- IV$ |
| $(d)$ ${Al}^{3+}$ | $(iv)$ Group $- IIB$ |
Choose the most appropriate answer from the options given below :
$CS_2 + 3O_2 \,\,\to \,\, 2SO_2 + CO_2$
$MgO(s) + C(s) \to Mg(s) + CO(g)$, for which $\Delta _r{H^o} = + 491.1\,kJ\,mo{l^{ - 1}}$ and $\Delta _r{S^o} = 198.0\,Jk^{-1}\,mo{l^{ - 1}}$ is not feasible at $298\, K$. Temperature above which reaction will be feasible is.....$K$