Question

What is the valence possible to Arsenic with respect to oxygen and hydrogen?
(A) The general electronic configuration of Arsenic (VA group) is $n{s^2}n{p^3}$
(B) Valence of arsenic with respect to oxygen is $5\left( {{M_2}{O_5}} \right)$
(C) Valence of arsenic with respect to hydrogen is $3\left( {M{H_3}} \right)$
(D) None

Answer 1

Arsenic is a metalloid, belonging to group $15$ of the periodic table. Arsenic is symbolized as $As$ and has an electron configuration $4{s^2}4{p^3}$. It is found in the earth’s crust, rocks, water and air in the form of organic and inorganic compounds.

Complete step by step answer:
As interpreted from the periodic table, arsenic has an atomic number $33$ . Arsenic is a metalloid; therefore its properties are intermediate of metals and non-metals
Also, arsenic exists in variable oxidation states of $+ 5$ and $+ 3$.
Arsenic forms compounds with various elements by using its variable valencies.
Compound of arsenic with hydrogen:
When arsenic reacts with hydrogen, it forms arsine with a chemical formula.
$As{H_3}$ by using the $+ 3$ oxidation state.
Arsine is an inorganic compound which is very toxic in nature. It is also known as arsine.
Compound of arsenic with oxygen:
Arsenic reacts with oxygen by using its two variables oxidation states $+ 3$ and $+ 5$
$+ 3$ oxidation state compound with oxygen is arsenic trioxide ($A{s_2}{O_3}$). It is commonly used in medicines.
$+ 5$ oxidation state compound with oxygen is arsenic pentoxide ($A{s_2}{O_5}$) inorganic compound.
Hence, we can see that arsenic combines with hydrogen and oxygen and forms compounds with general $M{H_3}$, ${M_2}{O_3}$ and ${M_2}{O_5}$ where, $M$ is arsenic.

So, the correct answer is Option B,C.

Note: Arsenic combines with various other elements and forms compounds like methylarsonic acid, arsenobetaine, sodium arsenite, arsenic acid, etc.The form of arsenic with valency $+ 3$ is called arsenite and that with $+ 5$ is arsenate.