<u>Explanation:</u>
In an electrochemical cell, two half electrochemical processes occur. One of which is oxidation process and other is reduction process.
Oxidation reaction is defined as the reaction in which an atom looses its electrons. The oxidation number of the atom gets increased during this reaction.

Reduction reaction is defined as the reaction in which an atom gains electrons. The oxidation number of the atom gets reduced during this reaction.

Oxidation half reaction occurs at anode and reduction half reaction occurs at cathode.
Half reaction of the overall reaction represents the two processes which occur inside the cell which is oxidation and reduction.
(11.21 g BaSO4) / (233.4 g/mol BaSO4) = 0.0480 mol BaSO4 and original barium salt
<span>(10.0 g) / (0.0480 mol) = 208.3 g/mol </span>
<span>So it must have been BaCl2.
I think it letter A.
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Gravity is a force which tries to pull two objects toward each other. Anything which has mass also has a gravitational pull. The more massive an object is, the stronger its gravitational pull is. Earth's gravity is what keeps you on the ground and what causes objects to fall.
It has ns1 electron configuration like the alkali metals.
Answer and Explanation:
I believe the answer is 8