Lakhmir Singh and Manjit Kaur Solutions for Chapter: Chemical Effects of Electric Current, Exercise 2: Short Answer Type Questions

Why does a brand-new bicycle have shining handle-bar and wheel rims? What will happen if these are accidentally scratched?

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

When the free ends of a conductivity tester (made by using a battery connected to a wire wound around a compass) are dipped into a solution, the magnetic needle shows deflection. Can you give the reason for this deflection.

A beaker contains an acidified copper sulphate solution. A copper plate and a carbon rod are kept in this copper sulphate solution. The copper plate is connected to the positive terminal of a battery whereas the carbon rod is connected to the negative terminal of the battery. What will you observe when an electric current is passed through this set-up for a considerable time?

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

In case of a fire, before the firemen use the water hoses to throw water to douse fire, they shut off the electricity supply for the area. Explain why this is done.

 Which effect of electric current is utilised when a thin layer of chromium metal is deposited on an iron tap? What is this process known as?

For electroplating copper on an iron object, which terminal of the battery (positive or negative) is connected to the iron object? Also name the electrolyte you will use for this purpose.