1. Give reason for each of the following in one word or sentence:
lonic compounds have high melting points
He is not evolved when metals react with HNO3.
Ca and Mg start floating after they react with H2O
K and Na are kept immersed in kerosene
Zinc oxide is called amphoteric oxide
Gallium and Cesium melt if we keep them on your palm
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1) Because ionic compound have rigid structure and strong intermolecular force.
2) Because HNO3 is strong oxidising agent so, it reduced to NO2 or NO3.
4) Because to protect them from air as they are highly reactive element and react vigorously when exposed to air.
5) Because ZnO react with acid as base and with base as acid to neutralize the solution.
6) Because they have very low melting point (less than room temperature).
Explanation:
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