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Question 1 of 20
1. Question
During the electrolysis of dilute tetraoxosulphate (VI) acid solution, 0.05 mole of electrons were passed. What volume of gas was produced at the anode?
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Question 2 of 20
2. Question
What volume of 0.750moldm-3 Na2CO3 solution could be diluted to 250cm3 to reduce concentration of 0.025moldm-3
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Question 3 of 20
3. Question
The reaction, Y → Product is of first order with the initial concentration of
Y = 3.55 x 10-3 moldm-3 and the rate constant of 5.25 x10-3 moldm-3
What is the half-reaction
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Question 4 of 20
4. Question
Given the half-cell reaction, 2Br → Br2 how many moles of electron will be required to produce 0.56dm3 of bromine at s.t.p.? [molar volume of gas at s.t.p 22.4 dm3]
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Question 5 of 20
5. Question
The equilibrium constant, Kc for the reaction
What is the value of K for the reaction
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Question 6 of 20
6. Question
An atom has a core and outside the core an electron occupies an orbital for which the principal quantum number
n = 4, L = 0, m = 0, and s = +1/2 and –1/2
The atom is likely to be
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Question 7 of 20
7. Question
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Question 8 of 20
8. Question
What quantity of current is required to deposit 2.4g of copper in a period of 750 seconds during an electrolytic deposition process? [Cu 64, IF = 96500C mol-1]
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Question 9 of 20
9. Question
Platinum electrodes are dipped into copper sulphate solution in a voltameter. The solution left after electrolysis is
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Question 10 of 20
10. Question
What volume of water is produced when a mixture of 150cm3 of hydrogen and 100cm3 of oxygen is exploded in a eudiometer?
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Question 11 of 20
11. Question
A chloroform solution of pure organic compound was spotted at a distance of 0.80cm from the base of a 20cm long chromatoplate. If the compound has the rf-value of 0.505 and moves halfway up the 20cm long plate, which is the distance of the solvent front from the top of the plate upon elution?
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Question 12 of 20
12. Question
The main organic product named when bromine water is added to but-1-ene is
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Question 13 of 20
13. Question
The standard reduction potentials for the following half-cell reactions are,
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Question 14 of 20
14. Question
Bonding in ammonium chloride is
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Question 15 of 20
15. Question
Valence shell electron pair theory through hybridization predicts that boron trichloride is
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Question 16 of 20
16. Question
The basic tenet of valence bond electron pair repulsion theory is that the pairs of electrons making the sigma bonds dictate the shape of molecules. The pi-bonds often encounter in some molecules serve to
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Question 17 of 20
17. Question
A chemical equilibrium is established when
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Question 18 of 20
18. Question
Oxygen is extracted from water by
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Question 19 of 20
19. Question
Excess ethanol was soarked with 3g of pure oxygen in a combustion chamber. How many molecules of CO2 are produced? [N = 6.02 × 1023 molecules mol−1]
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Question 20 of 20
20. Question
The energy for the dissociation of molecule AB in kJ in the diagram of energy against the reaction coordinate shown below is:
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