Elements And Metals : 1

Question 1 :

Brass gets discoloured in air because of the presence of which of the following gases in air?

A). Oxygen
B). Hydrogen sulphide
C). Carbon dioxide
D). Nitrogen
Answer : Option B

Question 2 :

Which of the following is a non metal that remains liquid at room temperature?

A). Phosphorous
B). Bromine
C). Chlorine
D). Helium
Answer : Option B

Question 3 :

Chlorophyll is a naturally occurring chelate compound in which central metal is

A). copper
B). magnesium
C). iron
D). calcium
Answer : Option B

Question 4 :

Which of the following is used in pencils?

A). Graphite
B). Silicon
C). Charcoal
D). Phosphorous
Answer : Option A

Question 5 :

Which of the following metals forms an amalgam with other metals?

A). Tin
B). Mercury
C). Lead
D). Zinc
Answer : Option B