Observe the given experimental set-up carefully.
Which of the following could be the possible observation and inference drawn?
A The solution becomes blue-green due to formation of copper oxide, P is acidic.
B The solution becomes blue-green due to formation of copper chloride, P is basic.
C The solution becomes white due to formation of calcium hydroxide, P is basic.
D The solution becomes white due to formation of calcium oxide, P is acidic.
the correct answer should be (b) because copper cant displace h2 from HCl