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Question 1 of 22
1. Question
A motor truck releases an average of 5.0g CO into the air for every km covered. How many molecules of CO will be emitted into the air if the truck travels 8 km?
[C = 12; O = 16; NA= 6.02 × 1023]CorrectIncorrect -
Question 2 of 22
2. Question
A sample of an organic compound was weighed to 0.250g and subjected to Kjeldahl treatment. The ammonia produced was neutralized by 27cm3 of 0.100 mol dm -3 HCL.
What is the percentage of nitrogen in the compound?[H=1; N = 14]
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Question 3 of 22
3. Question
How many moles of electron will be required to produce 3 x 1022 molecules of water?
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Question 4 of 22
4. Question
The quantum number l in an atom defines
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Question 5 of 22
5. Question
The hybridization of the central atom in a molecule
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Question 6 of 22
6. Question
Lithium with atomic number of 3 is a
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Question 7 of 22
7. Question
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Question 8 of 22
8. Question
When CaC2 reacts with water, the organic product form is
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Question 9 of 22
9. Question
100cm3 of ethyne was mixed with 240cm3 of oxygen in a combustion chamber. What volume of carbon (iv) oxide is produced?
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Question 10 of 22
10. Question
Uranium-235 explodes when bombarded with a slow-moving neutron according to the equation below:
The atomic number and mass of Ba respectively are
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Question 11 of 22
11. Question
The reduction potential of two electrodes are
Calculate the free energy change for the cell that is made up of the electrodes [F = 96500 Coulomb mol−1]
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Question 12 of 22
12. Question
Which of these will not show the property of a permanent diploe
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Question 13 of 22
13. Question
A sample of water weighs 200.00g at 298K. What is the volume of this quantity of water in cubic meters given that the density of water at 298K is 0.98gcm-3?
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Question 14 of 22
14. Question
What is the pH of 500cm3 of 0.02 moldm-3 Tetraoxosulphur (VI)acid? NO ANSWER
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Question 15 of 22
15. Question
The main product of electrophilic addition of HCl to 2-methylpropene is
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Question 16 of 22
16. Question
Which of the following compounds would you expect to show a positive iodoform test?
(i) Butanone
(ii) Propanoic acid
(iii) Ethanol
(iv) Benzaldehyde
(v) But-2-oneCorrectIncorrect -
Question 17 of 22
17. Question
The complete combustion of one mole of an alkanol is shown below:
What is the value of x in terms of n?
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Question 18 of 22
18. Question
An ion has a charge of +3. The nucleus of the ion has a mass of 120. The number of neutrons in the nucleus is 1.50 times that of the number of protons. How many electrons are in the ion?
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Question 19 of 22
19. Question
Consider the following-reactions
Which of these reactions are redox reactions?
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Question 20 of 22
20. Question
Which of the following metals cannot displace hydrogen from steam?
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Question 21 of 22
21. Question
If the temperature of the reaction is reduced from 600°C to 300°C and no other changes take place then
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Question 22 of 22
22. Question
The molarity of 5% by weight of aqueous solution of tetraoxosulphate(VI) acid [molecular weight = 98] is
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