Name a common substance that exists in all the three states of matter.
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Water exists in all the three physical states : as solid (ice), as liquid (water) and as gas (water vapour).
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What are the constituent units of crystals of :
(a) Iodine
(b) Sodium chloride
(a) What is meant by the term 'atomicity of a gas'?
(b) Name a gas that is diatomic.
Give an example of an endothermic reaction.
An element X is trivalent. Write the balanced equation for the combustion of X in oxygen.