What happens when the compound hcl is formed?
a) hydrogen transfers two electrons to chlorine.
b) hydrogen receives two electrons from chlorine.
c) hydrogen forms an ion with −1 charge; chlorine forms an ion with +1 charge.
d) hydrogen forms an ion with +1 charge; chlorine forms an ion with −1 charge.

Hydrogen chloride may be formed by the direct combination of chlorine (Cl2) gas and hydrogen (H2) gas; the reaction is rapid at temperatures above 250° C (482° F). The reaction, represented by the equation H2 + Cl2 → 2HCl, is accompanied by evolution of heat and appears to be accelerated by moisture.

The correct answer is Option D.

Explanation:

Ionic compounds are defined as the compounds which are formed by the complete transfer of electrons from one atom to another atom. In these compounds, oppositely charged ions are attracted towards each other to form a compound.

Hydrogen is the 1st element of the periodic table having 1 electron. The electronic configuration of this element is

This will loose 1 electron to form ion.

Chlorine is the 17th element of the periodic table having 17 electrons. The electronic configuration of this element is

This will gain 1 electron to form ion.

To form HCl compound, 1 hydrogen ion is needed to neutralize the charge on chlorine ion.

Hence, the correct answer is Option D.

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  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-