Redox Reactions question bank (Chemistry)

$500$ mL of $0.2$ M MnO$_4^-$ solution in basic medium when mixed with $500$ mL of $1.5$ M KI solution, oxidises iodide ions to liberate molecular iodine. This liberated iodine is then titrated with a standard $x$ M thiosulphate solution in presence of starch till the end point. If $300$ mL of thiosulphate was consumed, then the value of $x$ is __________.

Given below are two statements:
Statement I: Sodium dichromate and potassium dichromate are classified as primary standards in titrimetric analysis.
Statement II: Phenolphthalein is a weak base, therefore it dissociates in acidic medium.
In the light of the above statements, choose the correct answer from the options given below