Neco Chemistry Past Questions and Answers

Question 126:

• NECO 2009

When air is passed through alkaline pyrogallol and then lime water, the gases left are ____________

A. Nitrogen and carbon (IV) oxide
B. Nitrogen and noble gases
C. Nitrogen and oxygen
D. Nitrogen, carbon (VI) oxide and noble gases
E. The noble gases

Question 127:

• NECO 2009

How many zones are present in a luminous Bunsen burner flame?

A. 2
B. 3
C. 4
D. 5
E. 6

Question 128:

• NECO 2009

What mass of copper in gram would be deposited by a current of 1.00ampere passing for 965 seconds through copper(II) tertraoxosulphate (VI) solution? [Cu 63.5; If = 96500c]

A. 0.32
B. 0.64
C. 3.18
D. 6.35
E. 9.65

Question 129:

• NECO 2009

Which of the following metals is NOT extracted by electrolysis?

A. Aluminium
B. Calcium
C. Iron
D. Magnesium
E. Sodium

Question 130:

• NECO 2009

The furring of kettles and boilers are caused by ____________

A. Calcium hydroxide
B. Calcium hydrogen trioxocarbonate (IV)
C. Calcium trioxocarbonate (IV)
D. Calcium tetraoxocarbonate
E. Magnesium tetraoxocarbonate (VI)