Year :
2001
Title :
Chemistry
Exam :
NECO - BECE
Paper 1 | Objectives
31 - 40 of 41 Questions
| # | Question | Ans |
|---|---|---|
| 31. |
The green colour solution of an Fe2 salt changes to a brown solution of an Fe3+ salt by A. conversion. B. elimination. C. oxidation. D. reduction. E. substitution. |
C |
| 32. |
NaCl(s) does NOT conduct electricity, but N(aq) does. This is because A. NaCl(s) is non-ionic but NaCl(aq) is ion B. NaCl(aq) contains mobile electrons, where absent in NaCl(s). C. NaCl(aq) contains mobile ions which Nacl,) does not contain. D. NaCl(s) ionizes partiality while NaCl(aq) iodizes completely. E. – |
C |
| 33. |
To test for the presence of chloride ions in ion, correct sequence of reagents to use is A. Ba(NO3)2(aq) then HNO3(aq). B. HCl(aq) then Ba(NO3)2(aq). C. HCl(aq) then Ag3(aq). D. HNO3(aq) then fresh FeSO4(aq). E. HNO3(aq) then AgNO3(aq). |
E |
| 34. |
Ethanol is a product of fermentation of simple sugars. Which method is used to separate ethanol from the other products? A. boiling off the ethanoic B. filtration C. fractional crystallisation D. fractional distillation E. isomerisation |
D |
| 35. |
Which method is NOT used to determine rate of a reaction? A. change in amount of precipitate formed B. change in equilibrium constant C. change in intensity of colour D. change in pH values. E. change in total gas pressure |
B |
| 36. |
Detergents are better than soaps for washing in hard water because A. hard water contains insoluble calcium salts. B. they contain bleaching powder. C. they contain palmitic acid. D. they do not form insoluble calcium and magnesium salts. E. they are organic compounds. |
D |
| 37. |
Fructose and glucose are A. allotropes of each other. B. both disaccharides C. dimere of each other. D. isomers of each other E. isotopes of each other |
D |
| 38. |
A measure of the degree of disorderliness in a chemical system is known as the A. activation energy B. enthalpy C. entropy D. equilibrium E. free energy. |
C |
| 39. |
When an electric current is passed through a solution containing dilute tetraoxosulphate (Vi) acid, 190 cm3 of hydrogen gas is evolved. if the measurements were made at 26°C and 736 mmHg, what is the volume of hydrogen at s.t.p.? A. 164 cm3 B. 168 cm3 C. 179.1.cm3 D. 201.5cm3 E. 546 cm3 |
B |
| 40. |
If an element X with atomic number 13 combines with an element Y whose atomic number is 8 the most likely formula of the compound formed between X and Y is A. XY B. X2Y C. XY2 D. X3Y2 E. X2Y3 |
E |
| 31. |
The green colour solution of an Fe2 salt changes to a brown solution of an Fe3+ salt by A. conversion. B. elimination. C. oxidation. D. reduction. E. substitution. |
C |
| 32. |
NaCl(s) does NOT conduct electricity, but N(aq) does. This is because A. NaCl(s) is non-ionic but NaCl(aq) is ion B. NaCl(aq) contains mobile electrons, where absent in NaCl(s). C. NaCl(aq) contains mobile ions which Nacl,) does not contain. D. NaCl(s) ionizes partiality while NaCl(aq) iodizes completely. E. – |
C |
| 33. |
To test for the presence of chloride ions in ion, correct sequence of reagents to use is A. Ba(NO3)2(aq) then HNO3(aq). B. HCl(aq) then Ba(NO3)2(aq). C. HCl(aq) then Ag3(aq). D. HNO3(aq) then fresh FeSO4(aq). E. HNO3(aq) then AgNO3(aq). |
E |
| 34. |
Ethanol is a product of fermentation of simple sugars. Which method is used to separate ethanol from the other products? A. boiling off the ethanoic B. filtration C. fractional crystallisation D. fractional distillation E. isomerisation |
D |
| 35. |
Which method is NOT used to determine rate of a reaction? A. change in amount of precipitate formed B. change in equilibrium constant C. change in intensity of colour D. change in pH values. E. change in total gas pressure |
B |
| 36. |
Detergents are better than soaps for washing in hard water because A. hard water contains insoluble calcium salts. B. they contain bleaching powder. C. they contain palmitic acid. D. they do not form insoluble calcium and magnesium salts. E. they are organic compounds. |
D |
| 37. |
Fructose and glucose are A. allotropes of each other. B. both disaccharides C. dimere of each other. D. isomers of each other E. isotopes of each other |
D |
| 38. |
A measure of the degree of disorderliness in a chemical system is known as the A. activation energy B. enthalpy C. entropy D. equilibrium E. free energy. |
C |
| 39. |
When an electric current is passed through a solution containing dilute tetraoxosulphate (Vi) acid, 190 cm3 of hydrogen gas is evolved. if the measurements were made at 26°C and 736 mmHg, what is the volume of hydrogen at s.t.p.? A. 164 cm3 B. 168 cm3 C. 179.1.cm3 D. 201.5cm3 E. 546 cm3 |
B |
| 40. |
If an element X with atomic number 13 combines with an element Y whose atomic number is 8 the most likely formula of the compound formed between X and Y is A. XY B. X2Y C. XY2 D. X3Y2 E. X2Y3 |
E |