Jamb Chemistry 2012 Past Questions and Answers

Question 31:

• JAMB 2012

Which of the following gases has a characteristic pungent smell, turns red litmus paper blue and forms dense white fumes with hydrogen chloride gas?

A. N₂
B. N₂O
C. CI₂
D. NH₃

Question 32:

• JAMB 2012

Commercial bleaching can be carried out using

A. Sulphur (IV) oxide and ammonia
B. Hydrogen sulphide and chlorine
C. Chlorine and sulphur (IV) oxide
D. Ammonia and chlorine

Question 33:

• JAMB 2012

Mineral acids are usually added to commercial hydrogen peroxide to

A. Oxidize it
B. Decompose it
C. Minimize its decomposition
D. Reduce it to water and oxygen

Question 34:

• JAMB 2012

Which of the following compounds will burn with a brick-red colour in a non-luminous Bunsen flame?

A. LiCI
B. NaCl
C. CaClN₂
D. MgClN₂

Question 35:

• JAMB 2012

The purest from of iron which contains only about 0.1% carbon is

A. Pig iron
B. Wrough iron
C. Cast iron
D. Iron pyrite