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Question
Name three liquids, which when tested in the manner shown in Figure, may cause the magnetic needle to deflect.
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Solution
Tap water, hydrochloric acid, sodium hydroxide.
RELATED QUESTIONS
The process of depositing a layer of any desired metal on another material by means of electricity is called ______.
Electroplating is an example for ______.
Boojho and Paheli performed experiments taking similar bulbs and cells but two different solutions A and B as shown in the following figure.
 |
 |
| Boojho's Experiment | Paheli's Experiment |
| (A) | (B) |
They found that the bulb in the setup A glows more brightly as compared to that of the setup B. You would conclude that
Boojho’s uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory
The object to be electroplated is taken as ______ electrode.
In the circuit given as 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 still be 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.
A chemical reaction happens when electricity passes through various conducting liquids.
The terminal which is connected to a positive terminal of a battery is called ______.
Match the following
| 1. | Anode | a. | Conducting solution |
| 2. | Cathode | b. | Positive terminal |
| 3. | Ions | c. | Negative terminal |
| 4. | Electrolyte | d. | Positively or negatively charged |
