not feasible
at equilibrium
feasible
exothermic
Correct answer is C
For a reaction to be feasible, ΔG has to be negative.
What current will deposit 3.25g of zinc in 2hrs?
[Zn = 65, F = 96500 mol-]
3.25A
2.00A
1.34A
0.67A
Correct answer is C
No explanation has been provided for this answer.
Which of the following metals is purified commercially by electrolysis?
Zn
Fe
Sn
Cu
Correct answer is D
Electrolysis is used extensively in metallurgical processes, such as in extraction (electrowinning) or purification (electrorefining) of metals from ores or compounds and in deposition of metals from solution (electroplating).
Copper is purified by electrolysis . Electricity is passed through solutions containing copper compounds, such as copper(II) sulfate.
The oxidation state of Cr in K\(_2\)Cr\(_2\)O\(_7\) is?
+7
+6
+5
4
Correct answer is B
Potassium dichromate, K\(_2\)Cr\(_2\)O\(_7\)
→ [1 * 2] + [Cr * 2] + [-2 * 7] = 0
→ 2 + 2Cr - 14 = 0
→ 2Cr = 12
→Cr = \(\frac{12}{2}\) → 6
yellow to purple
orange to green
green to orange
purple to yellow
Correct answer is B
Reducing agent like SO\(_2\).
Sulphur dioxide gas (SO\(_2\)) is bubbled through acidified potassium dichromate. The orange solution turns green.