Question

Zn is tested with cobalt nitrate test instead of charcoal cavity test because :

• A. on heating metal carbonate we get a colourless residue which cannot be surely said to be ZnO.
• B. in charcoal cavity test Zn reacts with carbon present in it.
• C. heat of formation of ZnO is very high
• D. none of the above

Answer 1

The correct option is A on heating metal carbonate we get a colourless residue which cannot be surely said to be ZnO.

Zn is tested with cobalt nitrate test instead of charcoal cavity test because on heating metal carbonate we get a colourless residue which cannot be surely said to be ZnO.