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Which of the following sets are empty se...

Which of the following sets are empty sets ?
(i) `{x:x^(2)=2` and x is a rational number}
(ii) `{x:x` is an integer neither positive nor negative}
(iii) `{x:x` is a boy student is a girls college},
(iv) `{x:xlt5` and also `x gr5}`
(v) `{x:x` is a real number and `x^(2)lt0}`

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The correct Answer is:
`(i),(iii),(iv),(v)`
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