Which of the following methods is suitable for preventing an iron frying pan from rusting ?
Applying a coating of zinc
Applying grease
Applying paint
all of the above.
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be
Which of the following pairs will give displacement reactions ?
$(i)$ 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 ?
What are alloys ?
Give an example of a metal which
$(i)$ is a liquid at room temperature.
$(ii)$ can be easily cut with a knife.
$(iii)$ is the best conductor of heat.
$(iv)$ is a poor conduct of heat.