Which method is used for the purification of copper from its ore?
distillation
electrochemical
electrolysis
neutralization
reduction
Correct answer is C
No explanation has been provided for this answer.
0.01
0.05
0.1
0.5
2.8
Correct answer is B
No explanation has been provided for this answer.
\( ^{\text{760 x 22.4 x 308}} \text{750 x 273x 35.5} dm^3 \)
\( ^{\text{760 x 22.4 x 308}} \text{750 x 273}^x dm^3 \)
\( ^{\text{750 x 22.4 x 35.5}} \text{760 x 273dm3} \)
\( ^{\text{760 x 22.4 x 35.5}} \text{750x22.3x273} \)
\( ^{\text{760 x 22.4 x 35.5}} \text{750 x 308dm3} \)
Correct answer is B
No explanation has been provided for this answer.
How many Faradays of electricity are required to liberate 9g of aluminium? [Al = 27]
0.1
0.3
1
2.7
3
Correct answer is C
No explanation has been provided for this answer.
Which metal bromide is widely used in photography?
calcium bromide
magnesium bromide
potassium bromide
silver bromide
sodium bromide
Correct answer is D
No explanation has been provided for this answer.