Short answerEasy1 mark
6(a)
Identify the salts P, Q, R from the following observations:
Salt P has light bluish green colour. On heating, it produces a black 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.
Topic: Practical tests and observations
Previous-year question practice database
Answer
Exam answer
Copper(II) carbonate, CuCO₃.
Explanation
It is bluish green; on heating gives black CuO and CO₂.
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