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प्रश्न
Give reasons for the following.
Sodium and potassium are stored in kerosene.
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उत्तर
Sodium and potassium are stored in kerosene because they are highly reactive elements. They can easily catch fire even when in contact with air.
संबंधित प्रश्न
How are the properties of an alloy different from those of the constituent elements?
State two important uses of following metal:
Uses of zinc
The minerals from which the metal can be separated economically are called _______.
Higher Order Thinking Skills.
Aakash noticed that the metal latch on gate was difficult to open during hot sunny days. However, it was not difficult to open the same latch at night. Aakash observed that the latch and the gate are exposed to the sun during day time.
- Formulate a hypothesis based on the information provided.
- Briefly state how you would test the hypothesis.
A is a reddish-brown metal, which combines with O2 at < 1370 K gives B, a black coloured compound. At a temperature > 1370 K, A gives C which is red in colour. Find A, B, and C with reaction.
Which of the following metals are obtained by electrolysis of their chlorides in molten state?
- Na
- Ca
- Fe
- Cu
Which one of the following four metals would be displaced from the solution of its salts by other three metals?
All gases are ______.
Which metals are not solid at room temperature?
X [2, 8, 7] and Y [2, 8, 2] are two elements. Using this information, complete the following:
Metal atoms tend to have a maximum of ______ electrons in the outermost shell.
