Acid Structure and Relative Acidity The strength of an acid, HA, is often determ

Question

Acid Structure and Relative Acidity The strength of an acid, HA, is often determined by the strength and polarity of the HA bond. In general, a weaker and more polar bond leads to a stronger acid. For binary acids of elements in the same group of the periodic table, the HA bond strength decreases down the group, so acidity increases. For binary acids of elements in the same row of the periodic table, the polarity of the HA bond increases from left to right (as the electronegativity of A increases), so acid strength increases. For oxoacids, acid strength increases with the oxidation number of the central atom. If the oxidation number is the same, acid strength increases with the electronegativity of the central atom.

Part A

Rank the following compounds in order of decreasing acid strength using periodic trends.

HBr, HI, MgH2, and H2Se

Explanation / Answer

Answer :

Given ccomponents HBr , HI ,MgH2, H2Se .

Order of above compounds based on Decreasing acid strength.

1. HI

2. HBr

3. H2Se

4. MgH2

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