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ICSE Class 10 Chemistry 2019 Paper

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Arrange the following according to the instructions given in brackets:
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Question : 34 of 86
Marks: +1, -0
K,Pb,Ca,Zn\mathrm{K}, \mathrm{Pb}, \mathrm{Ca}, \mathrm{Zn} .
(In the increasing order of the reactivity)
Solution:  
  Pb<Zn<Ca<K.\; \mathrm{Pb} < \mathrm{Zn} < \mathrm{Ca} < \mathrm{K} .
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