Answer:
Answer is A
Explanation:
so Redox reaction is when one element is getting reduced and other oxidized
if u getting confused what is Reduction and what is oxidation remember it as
OIL RIG ;- oxidation is losing of electron ..... reduction is gaining of electron
now,
K is in free state so oxidation no is 0 and oxidation no of Ca is +2..... After the reaction K is Oxidized and Ca is Reduced
