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Chemical Effects Of Electric Current

Question

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What are the advantages of electroplating?

Solution

Electroplating has many advantages:

(i) It is used to coat metal surfaces with desired metal coatings, for decoration purposes.

(ii) It saves metal surfaces from rusting.

(iii) It saves corrosion of surfaces of metals.

(iv) Coating of chromium on metals give luster to objects.

(v) Cheap metals like iron, aluminium etc., can be coated with costly metals like silver, gold etc., to give them rich look as in case of artificial jewellery.

(vi) It can make reactive metals like iron etc., less reactive and they can be used for storing food items etc.

Some More Questions From Chemical Effects of Electric Current Chapter

A tester is used to check the conduction of electricity through two liquids, labeled A and B. It is found that the bulb of the tester glows brightly for liquid A while it glows very dimly for liquid B. You would conclude that

Does pure water conduct electricity? If not, what can we do to make it conducting?

In case of fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. Explain why they do this.

A child staying in the coastal region tests the drinking water and also the seawater with his tester. He finds that the compass needle deflects more in the case of seawater. Can you explain the reason?

Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? Explain.

Paheli had heard that rainwater is as good as distilled water. So she collected some rainwater in a clean glass tumbler and tested it using a tester. To her surprise she found that the compass needle showed deflection. What could be the reasons?

Prepare a list of objects around you that are electroplated.

The process that you saw in Activity 14.7 is used for purification of copper. A thin plate of pure copper and a thick rod of impure copper are used as electrodes. Copper from impure rod is sought to be transfered to the thin copper plate. Which electrode should be attached to the positive terminal of the battery and why?

What are conductors?

What are insulators?

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