Preparation and Properties of K2Cr2O7 and KMnO4 — Prelims Questions

Which of the following statements is INCORRECT regarding the preparation and properties of $K_2Cr_2O_7$?

What is the equivalent weight of $KMnO_4$ (Molar Mass = $158,\text{g/mol}$) when it acts as an oxidizing agent in a strongly alkaline medium?

Which of the following reactions correctly represents the disproportionation of manganate ions ($MnO_4^{2-}$) in an acidic medium?

When an orange solution of potassium dichromate is treated with an alkali, what color change is observed, and why?

In the preparation of $KMnO_4$ from pyrolusite ore ($MnO_2$), which of the following is the correct sequence of oxidation states of manganese?

Which of the following statements is TRUE regarding the stability and use of $K_2Cr_2O_7$ and $KMnO_4$ as primary standards in volumetric analysis?