A metal oxide (A) which reacts with HCl forms a blue coloured solution. Identify compound (A) and write its chemical formula. Write chemical reaction involved. What is the nature of metal oxide? Give an equation to justify your answer.
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https://www.meritnation.com/ask-answer/question/a-metal-oxide-a-which-reacts-with-hydrochloric-acid-froms/science/6214812