MCQ
Which group of elements could be placed in Mendeleev's Periodic Table without disturbing the original order?
- AAlkali metals
- BAlkaline earth metals
- CNon - metals
- DNoble gases
Explanation:
According to Mendeleevs classification, the properties of elements are the periodic function of their atomic masses and there is a periodic recurrence of elements with similar physical and chemical properties.
Noble gas being inert, could be placed in a separate group without disturbing the original order.
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$2H_2O(g) \rightleftharpoons 2H_2(g) + O_2(g); K_1 = 2.1 \times 10^{-13}$
$2CO_2(g) \rightleftharpoons 2CO(g) + O_2(g); K_2 = 1.4 \times 10^{-12}$
${N_2}{O_4}(g)\, \to \,2N{O_2}(g)$
Data for the given reaction is
$\Delta H = +54\,kJ$ and $E_a = + 57.2\,kJ$
.......$kJ$