Characteristic Compounds and Identification Reactions (21–30): Multiple Choice

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01Which cobalt compound gives the traditional 'cobalt blue' pigment (as a mixed oxide or aluminate)?
02Which copper compound is the characteristic bright blue hydrated sulfate often used in qualitative tests?
03Which nickel compound is a characteristic green hydrated sulfate used in identification tests?
04Which zinc compound is a common white powder (used as a pigment and antiseptic) and characteristic oxide of zinc?
05Which chromium compound is a characteristic green oxide pigment used as 'chrome green'?
06Which vanadium oxide is a well-known colorful compound (orange) and an important vanadium compound?
07Which iron oxide is the reddish-brown rust commonly used to describe iron(III) oxide?
08Which manganese compound is a common black oxide used industrially and as an oxidizing agent?
09Which oxide is the main pigment and characteristic compound of titanium known for whiteness?
10Which compound is the characteristic stable oxide of scandium?