4. Which is true about chalk?
(a) it has lustre
(b)it is opaque
(c) it floats on water
(d)it is soluble in water
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Answer:
c) it floats on water
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Answer:
(a) False, glass is transparent because it allows light to pass through it, while stone is opaque because it does not allow light to pass through it.
(b) False, notebook and eraser do not have any lustre because they are not metals.
(c) False, chalk is insoluble in water.
(d) True, wood floats on water because density of wood is lesser than that of water.
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