Use the periodic table to answer the question.

Question

An illustration shows the periodic table of elements with elements arranged in increasing order of atomic number in 18 columns (groups) and 7 rows (periods). The electronegativity of elements increases from left to right, across a period. The hydrogen on the left is included in group with medium electronegativity. Also, fluorine is shown as element with highest electronegativity.

Based on patterns in the periodic table, which list shows the acids in order from strongest to weakest?

(1 point)
Responses

H2S, PH3, HCl
H 2 S, PH 3 , HCl

PH3, H2S, HCl
PH 3 , H 2 S, HCl

HCl, H2S, PH3
HCl, H 2 S, PH 3

HCl, PH3, H2S

Answer 1

To determine the strength of the acids from the options given, we need to consider the electronegativity of the atoms involved in the acids.

1. HCl (hydrochloric acid): The chlorine atom is highly electronegative, which makes HCl a strong acid. It dissociates completely in water to produce H⁺ ions.

2. H2S (hydrosulfuric acid): Sulfur is less electronegative than chlorine but more electronegative than phosphorus. H2S is a weak acid, meaning that it does not dissociate completely in water.

3. PH3 (phosphine): PH3 is not typically classified as an acid; it is a relatively weak base, so it has very weak acidic properties compared to HCl and H2S.

So, in order of strength from strongest to weakest, the acids would be:

HCl > H2S > PH3

Thus, the correct answer would be:

HCl, H2S, PH3.