Which of the following metals is NOT extracted by electrolysis?
Aluminium
Calcium
iron
Magnesium
Sodium
Correct answer is C
No explanation has been provided for this answer.
0.32
0.64
3.18
6.35
9.65
Correct answer is A
Recall that two faradays ( 2 X 96500 ) will be required to discharge 1 mole of a divalent ion like Cu.
2 X 96500 will deposit 63.5g of Cu
And 965C wiil deposit x-grams
CROSS MULTIPLY
(965 X 63.5) ÷ ( 2 X 96500)
= 0.3175
How many zones are present in a luminous Bunsen burner flame?
2
3
4
5
6
Correct answer is C
The luminous bunsen burner flame has four zones namely:
When air is passed through alkaline pyrogallol and then lime water, the gases left are
nitrogen and carbon (IV) oxide
nitrogen and noble gases
nitrogen and oxygen
nitrogen, carbon (VI) oxide and noble gases
the noble gases
Correct answer is B
No explanation has been provided for this answer.
A salt which loses its mass when exposed to air is
deliquescent
effervescent
Efflorescent
fluorescent
hygroscopic
Correct answer is C
No explanation has been provided for this answer.