Give reasons : Sodium, potassium and lithium are stored under oil.
Give reasons : Sodium, potassium and lithium are stored under oil.
Sodium, potassium, and lithium are very reactive metals and react very vigorously with air as well as water. Therefore, they are kept immersed in kerosene oil in order to prevent their contact with air and moisture.
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You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels.
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What type of oxides are formed when non-metals combine with oxygen?
What type of oxides are formed when non-metals combine with oxygen?
Name two metals which are found in nature in the free state.
Name two metals which are found in nature in the free state.
Name two metals which will displace hydrogen from dilute acids, and two metals which will not.
Name two metals which will displace hydrogen from dilute acids, and two metals which will not.
$(i)$ Write the electron-dot structures for sodium. oxygen and magnesium.
$(ii)$ Show the formation of $Na _{2} O$ and $MgO$ by the transfer of electrons.
$(iii)$ What are the ions present in these compounds ?
$(i)$ Write the electron-dot structures for sodium. oxygen and magnesium.
$(ii)$ Show the formation of $Na _{2} O$ and $MgO$ by the transfer of electrons.
$(iii)$ What are the ions present in these compounds ?