metals, non metals, minerals, ores, properties, uses - Category wise Question and Answer Practice Test with Solutions

Question : 16

Which reducing agent is used in chemical reduction?

a) Al

b) C

c) CO

d) All of these

Question : 17 [NDA]

What is the colour of oxygen in solid state ?

a) Pale blue

b) Light green

c) Pale yellow

d) Greenish yellow

Question : 18 [PCS (Pre) 2015]

Which of the following do not react with water at all?

a) Lead

b) Magnesium

c) Iron

d) None of the above

Question : 19 [MPPCS (Pre) 1995]

Of how many carats is the pure gold?

a) 24

b) 28

c) 22

d) 20

Question : 20

Cinnabar is an ore of

a) Pb

b) Hg

c) Cu

d) Zn