Metals can be extracted from their ores by a process involving
reduction
oxidation
hydrolysis
decomposition
Correct answer is A
No explanation has been provided for this answer.
The oxidation number of iodine in the iodate ion (IO -3) is
-5
-1
+1
+5
Correct answer is D
1O3
[oxidation number of 1] + [oxidation number of 0] x 3 = -1
x + -2 x 3 = 1
x - 6 = - 1
x = - 1 + 6 = +5
Electrolysis is applied in the following processes except
electroplating
extraction of aluminium
extraction of iron
purification of copper
Correct answer is C
No explanation has been provided for this answer.
Increase in temperature
Decrease in temperature
Increase in pressure
Addition of O2 into the mixture
Correct answer is A
The reaction is an exothermic reaction (∆H=-197kjmol).
For continual yield of sulphur(IV)oxide, heat must be liberated.
So,increasing the temperature of the reaction will lead to reduction in yield of \(SO_3\) since it favours backward reaction which is endothermic.
Which of the following compounds absorbs moisture from the atmosphere and dissolves in it?
FeCI3
MgSO4.7H2O
Na2SO 4
KCI
Correct answer is A
No explanation has been provided for this answer.