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Why alkalies like sodium hydroxide and p...

Why alkalies like sodium hydroxide and potassium hydroxide should not be left exposed to air ?

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Because they are hygroscopic in nature and absorb moisture from atmosphere in which they ultimately dissolve.
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DINESH PUBLICATION-ACIDS, BASES AND SALTS -VERY SHORT ANSWER QUESTIONS
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  11. Give two examples of the salts belonging to the chloride family.

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  15. How does the pH change when the solution of base is diluted with water...

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  16. Which one or these has a higher concentration of H^(+) ions ? 1MHClo...

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  17. Which bases are called alkalies ? Give an example of alkalies ?

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  18. Name one natural source of each of the followign acids. (a). Citric ...

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