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B
Mercury and alcohol
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C
Benzene and water
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D
Oil and water
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Solution
The correct option is A Ethyl alcohol and water
Water is polar and has hydrogen bonding. Since, ethyl alcohol has oxygen atom it also undergoes hydrogen bonding when mixed with water. Also, ethyl alcohol is polar due to high electro-negativity of O, due to which it mixes with water. Hence, ethyl alcohol and water are a pair of miscible liquid mixture.