Question- Which is more reactive element in the pairs given:-

i)Sodium,Aluminium
ii)Zinc,Iron
iii)Potassium,Hydrogen
iv)tin,platinum
v)Gold,Silver
vi) Copper,Calcium

Kindly answer :)

Dear Student,
Reactivity of metals and non metals can be seen as this,
potassium > sodium > calcium > magnesium >aluminium >zinc > iron > tin > lead >hydrogen> copper > silver > gold > platinum
(i) sodium is more reactive than aluminium.it has bigger atomic size than aluminium
(ii) zinc is more reactive than iron.(as according to series)
or zinc is more electropositive element than iron and zinc has bigger atomic size than that of iron,thus more number of electrons.
(iii)potassium is more reactive than hydrogen.
(iv) platinum the least reactive metal in the series,so tin is the more reactive element than platinum.
(v)silver is the more reactive than gold because silver is more easily oxidized than gold.
(vi) calcium is more reactive than copper.
Regards.

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In chemistry, a reactivity series (or activity series) is an empirical, calculated, and structurally analytical progression[1] of a series of metals, arranged by their "reactivity" from highest to lowest.[2][3][4] It is used to summarize information about the reactions of metals with acids and water, single displacement reactions and the extraction of metals from their ores.
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potassium > sodium > calcium > magnesium > aluminium > zinc > iron > tin > lead > copper > silver > gold > platinum.
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