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The flow chart below shows a sequence of chemical reactions starting with copper. Study it and answer the questions that follow.
(a) In step 1, excess 3M nitric (V) acid was added to 0.5g of copper powder.
(i) State two observations which were made when the reactions was in progress.
(ii) Explain why dilute hydrochloric acid cannot be used in step 1.
(iii) (I) Write the equation for the reaction that took place in step 1.
(II) Calculate the volume of 3M nitric that was needed to react completely with 0.5g of copper powder. (Cu=63.5).
(b) Give the names of the types of reactions that took place in steps 4 and 5.
(c) Apart from the good conductivity of electricity, state two other properties that make it possible for copper to be extensively used in the electrical industry.