In an experiment, rod of metals P, Q and R were cleaned with sand paper and placed in a beaker containing water.

      

In an experiment, rod of metals P, Q and R were cleaned with sand paper and placed in a beaker containing water. Another set of rod was also cleaned and placed in a beaker containing dilute acid. After placing the rods in the two liquids bubbles of gas were seen around some of the rods as shown in the diagrams below.
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a) Why is it necessary to clean the rods with sand paper before dipping them into the liquids.
b) Arrange the three metals in order of their reactivity starting with the most reactive

  

Answers


John
a) To remove oxide coating which could inhibit reaction

b) Q,R,P.
johnmulu answered the question on April 6, 2017 at 14:08


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