Question

salt p has light bluish green colour. on heating, it produces coloured residue. salt p produces brisk effervescence with dil.hcl and the gas evolved turns lime water milky, but no action with acidified potassium dichromate solution.​

Answer 1

answer

copper carbonate

Explanation:

cuco3 when heated produce co2 and cuo

Answer 2

The salt p is CuCO3 (Cupric Carbonate)

• Given,
• The salt p has light bluish green colour - this means this is a transition metal complex most probably Cu complexes.
• The salt on heating produces coloured residue- this means the salt gives another transition metal complex. Also, it is undergoing decomposition reaction
• The salt with dil HCl gives brisk effervescence, this means CO2 is evolved, which turns lime water milky , because of CaCO3 production.
• Therefore, the salt has CO3 complex as negative group.
• Also ,it doesnot react with acidified K2Cr2O4 solution ,this means it is not an alcohol , aldehyde or ketone molecule.
• Neither it can be oxidized.
• This is clear that the complex is CuCO3
• CuCO3 produces CuO blue coloured residue with CO2 on heating.