1.

A green mass isformedin the charcoulcavity test when a colourless salt (X) is fussed withchbalt mitrate (X) may contain

Answer»

Aluminium
copper
Barium
Zine

Solution :Follow cobalt nitrate test
`ZnSO_(4) + Na_(2)CO_(3) RARR ZnCO_(3) + NASO_(4)`
`ZnCO_(3) rarr ZnO + CO_(2)`
`2Co(NO_(3))_(2) rarr 2CoO + 4NO_(2) + O_(2)`
`CoO + ZnO rarrunderset((Green))(CoZnO_(2))`


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