The reaction 2k(s) + br2(l) → 2kbr(s) is a(n) reaction.

The correct answer is oxidation-reduction.

Explanation:

This reduction-oxidation reaction is given by the following semi-reactions:

+ 2 → 2 (reduction)

2 - 2 → 2 (oxidation)

is an oxidation agent, K is a reducing agent.  

This means that oxidizes K by increasing its oxidation number from 0 to 1.

is reduced, decreasing its oxidation number from 0 to -1.

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there are no statements provided but here is why:

sulfur belongs to group 16 because it can be found in nature whether it is in a free or combined state.

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a polar bond is formed when electrons are shared unevenly between atoms