When electric current is passed through a conducting solution, there is a change of colour of the solution. This indicates

Which one of the following solutions will not conduct electricity

Which of the following solutions will not make the bulb glow in figure?

Boojho's uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory

Which of the following metals is used in electroplating to make objects appear shining?

The object to be electroplated is taken as.........electrode

One of the most common applications of chemical effect of electric current is..........

Small amount of a mineral salt present naturally in water makes it a.......of electricity

Give two examples of good conductors.

What is the ill effect of electroplating?

Will the solution of sugar in distilled water conduct electricity?

When a compass needle is brought near a current carrying wire, then what happens?

Why is tin electroplated on iron to make cans used for storing food?

A tester is used to check the conduction of electricity through two liquids, labelled A and B. The bulb of tester glows very brightly for liquid A. It is found that the bulb of the tester glows very dimly for liquid B. Which liquid is better conductor of electricity?

Can some fruits and vegetables conduct electricity? Explain with an example

Name three liquids which when tested in the manner shown in figure below may cause the magnetic needle to deflect.

Boojho made the circuit as shown in figure. He wanted to observe what happens when an electric current is passed through water. But he forgot to add a few drops of lemon juice to water. Will it make any difference to his observations? Explain

An electric current is passed through a conducting solution. List any three possible observations.

Paheli wants to deposit silver on an iron spoon. She took silver nitrate (AgNO₃) solution in a beaker and set up a simple circuit for electroplating. Which terminal of the battery should the spoon be connected to? What material should the other electrode be made of?

Last Wednesday, Suhail woke up late in the morning. So, he saw the time and suddenly realised that he got late for an interview, which he was supposed to give after reaching the venue by the right time. Immediately, he turned on the geyser but it did not work. He got more tensed, then he used an electric iron rod through which he got some boiled water for his bath. Actually, there was an earthing problem in the switch board about which he was unaware. He was barefooted and was just about to switch on the electric iron rod but was restricted to do so by his room partner living with him. It could be dangerous for Suhail.
(i) Explain in brief what could have happened with Suhail if he had switched on the electric iron rod barefooted.
(ii) Mention the values showed by Suhails room partner.

In the circuit given in the figure, Boojho observed that copper is deposited on the electrode connected to the negative terminal of the battery. Paheli tried to repeat the same experiment. But she could find only one copper plate. Therefore, she took a carbon rod as negative electrode. Will copper be still deposited on the carbon rod? Explain your answer.

You are provided with a magnetic compass, an empty matchbox, a battery of two cells and connecting wires. Using these objects, how will you make a tester for testing an electric circuit? Draw the necessary circuit diagram and explain.

Observe the circuit given in figure.

Boojho set up this circuit for purification of copper. What will be the nature of
(a) plate A
(b) plate B
(c) and the solution. Explain the process of purification