Question

activity of unknown elements
reactivity ranking
order the reactivity data for 4
unknown elements and their
what is the relative reactivity of the
elements from least to most reactive?
i (ion) j (ion) k (ion) l (ion)
element i x color change color change color change
element j color change x x x
element k color change x x color change
element l x x x x
element i and l are the same. element j and k
are the same. j and k are less than i and l.
element i < element k < element j < element l
element l < element j < element k < element i
element i and l are the same. element j and k
are the same. i and l are less than j and k.

Explanation:

Step1: Analyze the reactivity data

In the table, 'X' indicates no reaction and 'Color change' indicates a reaction. Element L has the most 'Color change' reactions with other elements, so it is the most reactive. Element I has the least number of 'Color - change' reactions among the four elements, so it is the least reactive. Element J and K have an intermediate number of reactions and are more reactive than I but less reactive than L.

Step2: Determine the order

Based on the above - mentioned analysis, the order from least to most reactive is Element I < Element K < Element J < Element L.

Answer:

Element I < Element K < Element J < Element L