The composition of purple of Cassius is

What is purple of casius?

What is purple of casis ?

Chemical composition of malachite is 'X'. Then the composition of azurite is

Transparent glassy solid strongly reducing, purple of cassius reduces and gives chromyl chloride test. B is

Transparent glassy solid strongly reducing, purple of cassius reduces and gives chromyl chloride test. A is

Transparent glassy solid strongly reducing, purple of cassius reduces and gives chromyl chloride test. C is