Question

$ZnC{o}_2{O}_4$ is also known as Rinmann’s green. If true enter 1, else enter 0.

Answer 1

Hint: Rinmann’s green is synthesized by doping of cobalt (II) oxide into zinc oxide. It is a zinc derivative.

Complete answer:
-Sven Rinamn, a Swedish chemist in 1780 discovered this compound.
-It is known by many names like cobalt green, cinnabar green, turquoise green, or zinc green.
-Rinmann’s green is a translucent green pigment.
-Rinmann’s green is water-insoluble.
-It is rarely used in industrial processes because it is a weak chromophore and relatively expensive compared to chromium(III) oxide.
-The chemical formula of Rinmann’s green is $Z{n}_{1-x}C{o}_{x}O$ .
-The structure and composition of Rinmann’s green depend on the value of x. When the value of $x\le 0.3$ , the material adopts the Wurtzite structure (of ZnO) and is intensely green. When the value of $x\ge 0.7$ , the material has the sodium chloride structure (of CoO) and is pink. Intermediate values of x will give a mixture of two phases.
So the statement is false.

Note: Cobalt green has been tested for use I “spintronic” (the study of the intrinsic spin of the electron and its associated magnetic field) devices. It is magnetic at room temperature which makes it attractive in this application.