Elements And Metals : 1

Question 11 :

Bromine is a

A). black solid
B). red liquid
C). colourless gas
D). highly inflammable gas
Answer : Option B

Question 12 :

The hardest substance available on earth is

A). Gold
B). Iron
C). Diamond
D). Platinum
Answer : Option C

Question 13 :

The variety of coal in which the deposit contains recognisable traces of the original plant material is

A). bitumen
B). anthracite
C). lignite
D). peat
Answer : Option D

Question 14 :

Tetraethyl lead is used as

A). pain killer
B). fire extinguisher
C). mosquito repellent
D). petrol additive
Answer : Option D

Question 15 :

Which of the following is used as a lubricant?

A). Graphite
B). Silica
C). Iron Oxide
D). Diamond
Answer : Option A