CHEMISTRY – 16th 1.30pm 1 :- 10cm3 of hydrogen was sparked with 10cm3 of oxygen at stp calculate the volume of unreacted gas CORRECT ANSWER = 5cm3 2 :- the acid anhydride that will produce weak acid in water is CORRECT ANSWER = SO2 3 :- in the laboratory preparation of trioxonitrtate (V)acid the nitrogen oxide formed as a by product is removed by CORRECT ANSWER = adding concentrated H2SO4 4 :- sodium hydroxide can be used CORRECT ANSWER = in the purification bauxite 5 :- an organic compound commonly used as disinfectant is CORRECT ANSWER = phenol 6 :- incomplete oxidation of ethanol yields CORRECT ANSWER = CH3CHO 7 :- in the reaction above x is CORRECT ANSWER = NH3 8 :- in the diagram above x is CORRECT ANSWER = SO2 9 :- calculate the amount in moles of a gas which occupies 10.5dm3 at 6 atm and 30C CORRECT ANSWER = 2.536 10 :- tin is unaffected by air at ordinary temperature due to its CORRECT ANSWER = weak electropositive character 11 :- the iupac nomenclature of the structure above is CORRECT ANSWER = 2-methyl but-1-ene 12 :- mild oxidation of propan-1-ol will yield CORRECT ANSWER = propanol 13 :- a mixture of sugar and sulphur can be best seperated by dissolution in water followed by CORRECT ANSWER = filtration and evaporation 14 :- the factor that lowers the activation energy of a chemical reaction is CORRECT ANSWER = catalyst 15 :- temporary hard water is formed when rain water containing dissolved carbon(IV)oxide flows over deposits of CORRECT ANSWER = CaCO3 16 :- in which of the following reactions will an increase in pressure shifts the equilibrium position to the left CORRECT ANSWER = 3H2+N2=2NH3 17 :- the reactions of halogens with alkanes in the presence of sunlight is an example of CORRECT ANSWER = SUSTITUTION REACTION 18 :- due to the high reactivity of sodium is usually stored under CORRECT ANSWER = PARAFFIN 19 :- the product of the decay of phosphorus -32 as beta – emitter is CORRECT ANSWER = 32S16 sulphur 20 :- calculate the amount in moles of silver deposited when 9650c of electricity is passed through a solution of silver salt CORRECT ANSWER = 10.8 21 :- 2.5g of potasium trioxonitrate(V)saturates 20g of water at 25C.calculate its solubility in gramme per 100g CORRECT ANSWER = 12.5g 22 :- ethene is prepared industrially by CORRECT ANSWER = cracking 23 :- when few drops of concentrated trioxonitrate (V)acid is added to an unknown sample and warmed an intense yellow concentration is oserved the likey functional group present in the sample is CORRECT ANSWER = minus CHO 24 :- the salt formed from a weak acid and a strong basehydrolyzes in water to form CORRECT ANSWER = a buffer solution 25 :- which of the following is the least soluble in water CORRECT ANSWER = AL(OH)3 26 :- the enzyme used in the hydrolysis of starch to dextrin and maltose CORRECT ANSWER = 27 :- the process that occurs when two equivalent form of a compound are in equilibrium is CORRECT ANSWER = resonance 28 :- in the diagram above y is CORRECT ANSWER = concentrated H2SO4 29 :- in the equation above x is CORRECT ANSWER = 4^2He 30 :- the constituent of air necessary in the rusting process are CORRECT ANSWER = O2 AND H2O 31 :- if Y-1s2 2s2 2p4 and X-1s2 2s2 2p6 3s2,the chemical formula of the likely compound formed between X and Y CORRECT ANSWER = XY 32 :- the constituent common too durahim and alcino is CORRECT ANSWER = AL(OH)3 33 :- the oxidation number of iodine in KIO# is CORRECT ANSWER = 5 34 :- the ability of an atom in a molecule to attract shared electron to itself is CORRECT ANSWER = electron affinity 35 :- butter is an example of emulsion in which CORRECT ANSWER = solid is dispersed in a liquid medium 36 :- calculate the mass of silver deposited when a current of 0.5 ampere was passed through a solution of coper(II)chloride for 45 minute in an electrolytic cell CORRECT ANSWER = 0.224 37 :- in th laboratory preparation of thyl ethanoate the water present in the mixture using a solution of CORRECT ANSWER = concentrated H2SO4 38 :- if the reaction above takes place at room temperature the change in G will be CORRECT ANSWER = positive 39 :- the pollutant that may deduce the condensation of water vapor in the atmosphere is CORRECT ANSWER = OXIDES OF NITROGEN 40 :- the ideal gas laws and equations are true for all gases at CORRECT ANSWER = high pressu[truncated by WhatsApp] Economics – (16th 1.30pm) 1. Increase in supply 2. Scale of preference 3. 180• 4. Limited liability company 5. Stock and shares 6. Gain a comparative cost advantage. 7. The quantity of currency in circulation 8. Inadequate technical and managerial skills 9. Diminishing returns 10. Dividing total cost by the total output 11. Owner 12. Forces of demand and supply 13. Taxation 14. Marginal product 15. Liberalization of foreign exchange rate 16. Payments made for goods and services 17. Capitalist economy 18. Diminishing and marginal utility 19. 40 20. 8 21. Regulates production and consumption 22. The available production and resources yield the highest output per head 23. Competitive demand 24. progressive tax 25. Stabilization of oil price in the international market 26. 20 27. Increase 28. High level of poverty 29. Comparative cost advantage 30. Subsistence farming 31. N50 32. III and IV 33. Over dependence on imported components 34. 3 35. The productivity of labour 36. Perfectly elastic 37. Money deposit banks 38. Consumers 39. The effect of diseases and pests 40. Fall ============================================== Economics – (16th 1.30pm) 1. Increase in supply 2. Scale of preference 3. 180• 4. Limited liability company 5. Stock and shares 6. Gain a comparative cost advantage. 7. The quantity of currency in circulation 8. Inadequate technical and managerial skills 9. Diminishing returns 10. Dividing total cost by the total output 11. Owner 12. Forces of demand and supply 13. Taxation 14. Marginal product 15. Liberalization of foreign exchange rate 16. Payments made for goods and services 17. Capitalist economy 18. Diminishing and marginal utility 19. 40 20. 8 21. Regulates production and consumption 22. The available production and resources yield the highest output per head 23. Competitive demand 24. progressive tax 25. Stabilization of oil price in the international market 26. 20 27. Increase 28. High level of poverty 29. Comparative cost advantage 30. Subsistence farming 31. N50 32. III and IV 33. Over dependence on imported components 34. 3 35. The productivity of labour 36. Perfectly elastic 37. Money deposit banks 38. Consumers 39. The effect of diseases and pests 40. Fall

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