Which of the following statements are true for Mohr's salt?

CHEMISTRY · Multi correct · A Level · Chemistry · Transition metals and their chemistry · Transition metals and their chemistry

Problem

Which of the following statements are true for Mohr's salt? (1) It decolourizes

\mathrm{KMnO_4}

solution. (2) It is a double salt. (3) It is a colourless salt. (4) It is a primary standard substance.