Select total true statements
(1) conc. `H_2SO_4` in used to acidify `KMnO_4`
(2) In aq. medium `Fe^(3+ )`is more stable than `Fe^(2+)`
(3) conc. `HNO _ 3 ` is used to acidify ` KMnO _ 4 `
(4) common product of heating in ` KMn O _ 4 & K _ 2 Cr _ 2 O _ 7 ` is `O _ 2` (g )
(5 ) ` Ce O _ 2 ` is good analytical agent
(6) Sc does not show variable valency
Options are

Options

A. 1
B. 2
C. 3
D. 4

Answer

C