Chemistry Past Questions and Answers

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:

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

Question 128:

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:

Which of the following metals is NOT extracted by electrolysis?

A Aluminium
B Calcium
C Iron
D Magnesium
E Sodium

Question 130:

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)