NDA CHEMISTRY 2013 PAST QUESTIONS
1. Equal masses of oxygen, hydrogen and methane are kept under
identical conditions. The ratio of the volume of gases will be ___.
A. 2: 16: 2
B. 2: 16: 1
C. 1: 16: 1
C. 1: 1: 1
2. The forces of attraction that exist between non-polar molecules are called ___.
A. Van der Waals/ dispersion forces
B. Covalent bonds
C. Ionic bonds
D. Electro-valent bonds
3. The Law which states that the amount of gas, dissolved in a liquid is proportional to its partial pressure is ___.
A. Dalton's. Law
B. Gay Lussac's Law
C. Henry's Law
D. Raoult's Law
4. The inert gases are __ in water.
A. sparingly soluble
B. insoluble
C. soluble
D. none of the above
The mass of one Avogadro number of helium atom is ___.
A, 1.00g
B. 4.00g
C. 8.00fg
D. 4 x 6.02 x 1023 g
A. 2: 16: 2
B. 2: 16: 1
C. 1: 16: 1
C. 1: 1: 1
2. The forces of attraction that exist between non-polar molecules are called ___.
A. Van der Waals/ dispersion forces
B. Covalent bonds
C. Ionic bonds
D. Electro-valent bonds
3. The Law which states that the amount of gas, dissolved in a liquid is proportional to its partial pressure is ___.
A. Dalton's. Law
B. Gay Lussac's Law
C. Henry's Law
D. Raoult's Law
4. The inert gases are __ in water.
A. sparingly soluble
B. insoluble
C. soluble
D. none of the above
The mass of one Avogadro number of helium atom is ___.
A, 1.00g
B. 4.00g
C. 8.00fg
D. 4 x 6.02 x 1023 g
6. The method that cannot be used for removing permanent hardness
of water is ___.
A. adding sodium carbonate
B. adding caustic soda
C. distillation
D. boiling
7. The following are the half-lives of four active isotopes. Which one of the following is the most dangerous to handle?
A. 3 billion years
B. l00 years
C. 0.01 minute
D. 13 days
8. The heat energy produced when the human body metabolizes 1 gram of fat is ___.
A. 30KJ
B. 1KJ
C. 39KJ
D. 29KJ
9. The luster of a metal is due to ___.
A. its high density
B. its high polishing
C. its chemical inverter
D. presence of free electrons
10. The number of waves in n x 10th Bolur's orbit are ___.
A. n2
B. n
C. n-2
D. n3
11. The graphite rods in the nuclear reactor ___.
A. react with U to release energy
B. produce neutrons
C. undergo combustion which triggers the nuclear fission
D. convert fast moving neutrons into thermal neutrons
12. The gas used for artificial ripening of green fruit is ___.
A. ethylene
B. ethane
C. carbon dioxide
D. acetylene
13. The metal used to recover copper from a solution of copper sulphate is ___.
A. Na.
B. Ag
C. Hg
D. Fe
14. The metallurgical process in which a metal is obtained in a fixed state is called ___.
A. smelting
B. roasting
C. calcinations
D. froth floatation
15. The number of d - electrons in Fe2+ (Z= 26) is equal to that of ___.
A. p - electrons in Ne (Z = 10)
B. s - electrons in Mg (Z = 12)
C. d electrons in Fe (z = 26)
D. p - electrons in CI (z = 17)
16. The Latin word Formica means ant. The name formic acid is derived from Latin word being ___.
A. this acid in ancient times was used to eliminate ant-hills
B. thin corrosive acid is secreted by ants to drive away their enemies
C. this acid was first obtained by the distillation of ants
D. ants are attracted by the odour of this acid
17. The empirical of an oxide of nitrogen containing 30.4% nitrogen is (N = 14.0, 0 =16.0)
A. N2O2
A. adding sodium carbonate
B. adding caustic soda
C. distillation
D. boiling
7. The following are the half-lives of four active isotopes. Which one of the following is the most dangerous to handle?
A. 3 billion years
B. l00 years
C. 0.01 minute
D. 13 days
8. The heat energy produced when the human body metabolizes 1 gram of fat is ___.
A. 30KJ
B. 1KJ
C. 39KJ
D. 29KJ
9. The luster of a metal is due to ___.
A. its high density
B. its high polishing
C. its chemical inverter
D. presence of free electrons
10. The number of waves in n x 10th Bolur's orbit are ___.
A. n2
B. n
C. n-2
D. n3
11. The graphite rods in the nuclear reactor ___.
A. react with U to release energy
B. produce neutrons
C. undergo combustion which triggers the nuclear fission
D. convert fast moving neutrons into thermal neutrons
12. The gas used for artificial ripening of green fruit is ___.
A. ethylene
B. ethane
C. carbon dioxide
D. acetylene
13. The metal used to recover copper from a solution of copper sulphate is ___.
A. Na.
B. Ag
C. Hg
D. Fe
14. The metallurgical process in which a metal is obtained in a fixed state is called ___.
A. smelting
B. roasting
C. calcinations
D. froth floatation
15. The number of d - electrons in Fe2+ (Z= 26) is equal to that of ___.
A. p - electrons in Ne (Z = 10)
B. s - electrons in Mg (Z = 12)
C. d electrons in Fe (z = 26)
D. p - electrons in CI (z = 17)
16. The Latin word Formica means ant. The name formic acid is derived from Latin word being ___.
A. this acid in ancient times was used to eliminate ant-hills
B. thin corrosive acid is secreted by ants to drive away their enemies
C. this acid was first obtained by the distillation of ants
D. ants are attracted by the odour of this acid
17. The empirical of an oxide of nitrogen containing 30.4% nitrogen is (N = 14.0, 0 =16.0)
A. N2O2
B. N2
C. NO2
D. N2O
18. Indicate which of the following statements is not true as we move from left to right along the periodic table.
A. Atomic mass of element increases
B. electro-positive character of clement increase
C. Atomic number of element increases
D. number of electrons in the outermost orbits of elements increases
19. In the redox reaction: 2Fe2e +Cl2 → 2Fe3e +2e
B. Cl2 reduced, because it oxidation number has change
C. Cl2 is reduced. because it molecules is changed
D. 2Fe2e is reduced_ because it has gained electron
20. How many grammes of hydrogen gas will be liberated when 6g of magnesium ribbon dissolves in 500cm3 of 6mol/dm3 of hydrochloric acid according to the equation?
2Mg +2HCl→ MgCl2 +H2 (Mg=24, cl=35.5, H=1)
(g) (gg)
A. 0.7g
B. 0.5g
C. 0.12g
D. 1.2g
21.
The above equation represents the manufacture of
A. rubber
B. polyethene
C. polystyrene
D. butane
22. Dehydration of CH3 CH2CH2 CH2OH gives
A. CH2=CH-CH2CH3
B. CH2
CH=CH-CH3
C. CH=C-CH2-CH3
D. CH2C=
CCH3
24. The best method to separate mixture of hexane (β pt
41.9k) and heptanes
(β pt 371.6k) is ___.
A. simple distillation
B. fractional distillation
C. crystallization
D. chromatography
25. In a qualitative analysis, which of these elements: carbon, nitrogen, sulphur, chlorine and hydrogen are detected using silver nitrate?
A. carbon
B. sulphur
C. chlorine
D. nitrogen
26. Which of the following is NOT correct for sigma (σ) bond?
A. sigma bonds are stronger than Pi (ᴨ) bonds
B. They are formed by the side way overlap of atomic orbitals
C. They are formed by lateral overlap of atomic orbitals
D. They are responsible for the formation of single bonds
27. Which of the following organic compounds will dissolve readily in Benzene?
(β pt 371.6k) is ___.
A. simple distillation
B. fractional distillation
C. crystallization
D. chromatography
25. In a qualitative analysis, which of these elements: carbon, nitrogen, sulphur, chlorine and hydrogen are detected using silver nitrate?
A. carbon
B. sulphur
C. chlorine
D. nitrogen
26. Which of the following is NOT correct for sigma (σ) bond?
A. sigma bonds are stronger than Pi (ᴨ) bonds
B. They are formed by the side way overlap of atomic orbitals
C. They are formed by lateral overlap of atomic orbitals
D. They are responsible for the formation of single bonds
27. Which of the following organic compounds will dissolve readily in Benzene?
A. C7H16
B. C2H50H
C. CH3C – CH3
D. CH2H2 COOH
28. Geometrical
isomers are:
A. isomers that are formed due to restricted rotation about double bond
B. isomers that are formed as a result of rotation about single bonds
C. isomers that are formed as a result of restricted rotation about triple bonds
D. none of the above
29. The breakdown of large molecules in fuel oil into smaller ones needed in petrol is __.
A. cracking
B. catenation
C. combustion
D. catalytic desulphurization
30. C4H10 +13/2 012→ 4CO2 +5H20
The above equation is a ___.A. isomers that are formed due to restricted rotation about double bond
B. isomers that are formed as a result of rotation about single bonds
C. isomers that are formed as a result of restricted rotation about triple bonds
D. none of the above
29. The breakdown of large molecules in fuel oil into smaller ones needed in petrol is __.
A. cracking
B. catenation
C. combustion
D. catalytic desulphurization
30. C4H10 +13/2 012→ 4CO2 +5H20
A. cracking
B. combustion reaction of petrol
C. reduction reaction
D. carbonation
31. 2, 4 - dinitrophemy/hydrazine is a reagent used till testing the presence of ___.
A. Alcohols
B. carboxylic acids
C. Nitrites
D. carbonyl compounds
32. Kipp's apparatus is used for the laboratory preparation of ___.
A. Sulphur
B. carbon dioxide
C. sulphur (iv) oxide
D. Nitrogen gas
33. Tollen reagent is used to differentiate between which pairs of organic compounds?
A. alcohols and ethers
B. amine and amide
C. aldehyde and ketones
D. carboxylic acid and esters
34. The solubility of solids increases with an increase in the temperature of solvent. Which of the following salts has its solubility unaffected with a rise in temperature?
A. KNO3
B. KI
C. KCI
D. NaCI
35. In the contact process for the manufacture of sulphuric acid, sulphur trioxide gas is not passed directly in water because
A. It is not so much soluble in water
B. It does not form sulphuric acid with water
C. Colloidal sulphur is deposited
D. A mist of fine chops of dilute sulphuric acid fill the pipes if direct
absorption in water is tried
36. Ammonia is used as a commercial refrigerant because:
A. It is a non-polar compound
B. The gas is very cheap
C. It is very soluble in water
d. It is very easily liquefied and when allowed to evaporate, absorbs large quantities of heat producing low temperature
37. 9Fe2O3 +2NH3→ 6 Fe3O4 + N2 + 3H2O
According to the balanced equation above, when one mole of NH3 reacts completely. Which of the following is true?
A. I mole of N2, must be formed
B. 3 mole of Fe3O4 must be formed
C. 1 mole of water must be formed
D. 4 moles of Fe3O4 must react
38. What is the IUPAC name of the compound whose structure is shown below?
A. 1, 2 Methyl pentane
B. 2, 3 Dimethylpropane
C. 2, 2 Dimethylpropane
D. 1, 2 Dimethylpropane
39, The composition of gunpowder is
A. 50% HNO3 , 35% charcoal and 15% sulphur
B. 70% HNO3, 15% charcoal and 15% sulphur
C. 75% HNO3, 15% charcoal and 10% sulphur
D. 65% HNO3,25% charcoal and 10% sulphur
40. The correct arrangement of the petroleum fractions in order of increasing boiling points is
A. Petrol < kerosene < diesel oil
B. Petrol < diesel oil < kerosene
C. Kerosene < diesel oil < petrol
D. Diesel oil < kerosene < petrol
2. A
3. A
4. B
5. D
6. D
7. C
8. C
9. B
10. D
11. D
12. A
13. D
14. A
15. D
16. B
17. C
18. B
19. B
20. B
21. B
22. A
23. B
24. B
25. C
26. B
27. A
28. A
29. A
30. B
31. D
32. C
33. C
34. A
35. D
36. D
37. B
38. C
39. C
40. A
B. 2, 3 Dimethylpropane
C. 2, 2 Dimethylpropane
D. 1, 2 Dimethylpropane
39, The composition of gunpowder is
A. 50% HNO3 , 35% charcoal and 15% sulphur
B. 70% HNO3, 15% charcoal and 15% sulphur
C. 75% HNO3, 15% charcoal and 10% sulphur
D. 65% HNO3,25% charcoal and 10% sulphur
40. The correct arrangement of the petroleum fractions in order of increasing boiling points is
A. Petrol < kerosene < diesel oil
B. Petrol < diesel oil < kerosene
C. Kerosene < diesel oil < petrol
D. Diesel oil < kerosene < petrol
ANSWERS
1. C2. A
3. A
4. B
5. D
6. D
7. C
8. C
9. B
10. D
11. D
12. A
13. D
14. A
15. D
16. B
17. C
18. B
19. B
20. B
21. B
22. A
23. B
24. B
25. C
26. B
27. A
28. A
29. A
30. B
31. D
32. C
33. C
34. A
35. D
36. D
37. B
38. C
39. C
40. A
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