State whether the statements given below are true or false.
(i) Stone is transparent, while glass is opaque.
(ii) A notebook has lustre while eraser does not.
(iii) Chalk dissolves in water.
(iv) A piece of wood floats on water.
(v) Sugar does not dissolve in water.
(vi) Oil mixes with water.
(vii) Sand settles down in water.
(viii) Vinegar dissolves in water.

(i) False, glass is transparent not opaque as it allows light to pass through it freely while stone is opaque as it does not allow light to pass through it. (0.5 Marks)
(ii) False, notebook and eraser both do not have lustre as they do not have shiny surface. (0.5 Marks)
(iii) False, chalk is insoluble in water. (0.5 Marks)
(iv) True, a piece of wood floats on water as it is lighter than water. (0.5 Marks)
(v) False, sugar is soluble in water. (0.5 Marks)
(vi) False, oil does not mixes with water. (0.5 Marks)
(vii) True, sand is insoluble in water and hence, settles down. (0.5 Marks)
(viii) True, vinegar is soluble in water. (0.5 Marks)