Q: Which one of the following statements is correct about diamond and graphite?
(a)Diamond and graphite have similar physical and chemical properties.
(b)Diamond is hard but graphite is smooth and slippery.
(c)Diamond and graphite are both non-conductors of electricity.
(d)Both diamond and graphite have similar structures.
Correct Answer: (b)
The correct answer is (b) 'हीरा कठोर होता है किंतु ग्रेफाइट मुलायम तथा विद्युत सुचालक होता है।'. This question from the General Studies domain tests knowledge of Miscellaneous.