Question

State whether the statements given below are True or False.​
(a) Stone is transparent, while glass is opaque.​
(b) A notebook has lustre while eraser does not.
(c) Chalk dissolves in water.
(d) A piece of wood floats on water.
(e) Sugar does not dissolve in water.
(f) Oil mixes with water.​
(g) Sand settles down in water.
(h) Vinegar dissolves in water.

Answer 1

(a)
Answer: False​
Correct statement: Stone is opaque, while glass is transparent.​
Explanation: ​
Transparent materials are those materials through which light passes completely.​
Opaque materials are those materials through which light can not pass.​

(b)
Answer: False​
Correct statement: Notebook and eraser do not have any lustre.​

(c)
Answer: False​
Explanation: Chalks do not dissolve in water. It forms a heterogenous solution in water and the particles of chalk can be seen with naked eyes.​

(d)
Answer: True​
Explanation: Wood floats on water because wood is less denser than water. Thus wood is used to make ships.​

(e)
Answer: False​
Explanation: Sugar dissolves in water and forms a transparent solution.​

(f)
Answer: False​
Correct statement: Oil is immiscible with water. ​
Oil forms a separate layer on the surface of water.​

(g)
Answer: True​
Explanation: Sand is denser than water and does not dissolve in water. Thus it settles down in water​

(h)
Answer: True​
Vinegar dissolves completely in water. ​