Chemistry
Arrange the following according to the instructions given in brackets:
(i) K, Pb, Ca, Zn. (In the increasing order of the reactivity)
(ii) Mg2+, Cu2+, Na1+, H1+ (In the order of preferential discharge at the cathode)
(iii) Li, K, Na, H (In the decreasing order of their ionization potential)
(iv) F, B, N, O (In the increasing order of electron affinity)
(v) Ethane, methane, ethene, ethyne. (In the increasing order of the molecular weight) [H = 1, C = 12]
Periodic Table
ICSE 2019
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Answer
(i) Pb < Zn < Ca < K
(ii) Cu2+, H1+, Mg2+, Na1+
Lower the position of the ion, greater the tendency to be liberated at the cathode (or respective electrode).
(iii) H > Li > Na > K
Ionization Potential decreases as we move down the group.
(iv) B < N < O < F
Electron Affinity increases from left to right across a period.
(v) Methane < Ethyne < Ethene < Ethane
Ethane [C2H6] : M.W. = 2[12] + 6[1] = 30
Methane [CH4] : M.W. = 12 + 4[1] = 16
Ethene [C2H4] : M.W. = 2[12] + 4[1] = 28
Ethyne [C2H2] : M.W. = 2[12] + 2[1] = 26
Hence, increasing order of molecular weight : Methane < Ethyne < Ethene < Ethane
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