On adding dilute hydrochloric acid to copper oxide powder, the solution formed is blue green. Write the new compound formed.

(a) Fresh milk has a pH of 6. When it changes into curd (yogurt), will its pH value increase or decrease ? Why ? (b) Name the gas evolved when dilute HCl reacts with sodium hydrogencarbonate. How is it recognised ? (c) On adding dilute hydrochloric acid to copper oxide powder, the solution formed is blue-green. Predict the new compound formed which imparts a blue-green colour to the solution.

On adding dilute hydrochloric acid to copper oxide powder, the solution formed is blue-green. (a). Predict the new compound formed which imparts a blue-green colour to solution. (b). Write a balanced chemical equation of the reaction which takes place. (c). On the basis of the above reaction, what can you say about the nature of copper oxide?

On adding dilute HCl to copper oxide powder the solution formed is blue green in colour. Predict the new compound formed which imparts a blue green colour to the solution.

dilute hydrochloric acid is added to zinc hydroxide.

An element reacts with oxygen to form an oxide which dissolves in dilute hydrochloric acid. The oxide formed turns a solution of red litmus blue. State two reasons to support your answer.

An element reacts with oxygen to form an oxide which dissolves in dilute hydrochloric acid. The oxide formed turns a solution of red litmus blue. Is the element a metal or a non-metal ?

An element reacts with oxygen to form an oxide which dissolves in dilute hydrochloric acid. The oxide formed also turns a solution of red litmus blue. Is the element a metal or a non-metal? Explain your answer.