CHEMISTRY EXAM QUESTIONS FOR SS2 FIRST TERM
FIRST TERM SS2 CHEMISTRY EXAMINATION QUESTIONS – EDUDELIGHT.COM
FIRST TERM EXAM CHEMISTRY
Examination malpractices may lead to a repeat of the subject or suspensions don’t be involved.
SUBJECT: CHEMISTRY TIME: 2HRS CLASS: SS 1
1. Scientific approach to discoveries follows the order which includes
(a) further experiment and problem solving (b) theory, negative and positive results and experiments (c) experiments, hypothesis and results. (d) observation, hypothesis and experiments
2. Chemical hypothesis is different from chemical law in that.
(a) hypothesis is not reasonable while law is reasonable
(b) hypothesis is a reasonable explanation to observations made while law is a statement from a scientist.
(c) hypothesis is a reasonable explanation to observation while law is a statement which confirms the hypothesis after extensive tests.
(d) none of the above.
3. Which of the following is correct about water molecule?
(a) it is made up of 2 oxygen atoms and 1 hydrogen atom
(b) it consists of 1 hydrogen atoms and 1 oxygen atoms.
(c) it is made up of 2 hydrogen atoms and 2 oxygen atoms
(d) it consists of 2 hydrogen atoms and 1 oxygen atoms
4. Which of the following is the smallest particle that have the properties of an element?
(a) ion (b) molecule (c) an atom (d) element
5. Which of the following compounds have atomicity greater than 2?
(i) H20 (ii) NaCl (iii) H2S (iv) Co2
(a) i, ii and iii (b) ii, iii and iv (c) I and ii only (d) i, iii and iv
6. When an atom gains an electron, its becomes
chemically inactive (b) Negatively charged (c) oxidized (d) a cation (e) a complex ion
7. The valence of sodium (Na) is (a) 2 (b) 1 (c) 3 (d) 8
8. Given the symbol 40 Y, it can be deduced that Y has.
20
60 neutrons (b) an atomic number of 20 (c) a mass number of 60 (d) 40 electrons (e) 40 protons
9. The mass number of an atom is the sum of its
(a) Electrons, neurons and protons (b) Electrons and protons
(c) protons and neutrons (d) Orbital electrons (e) Valence electrons
10. A molecule of neon is (a) ionic (b) diatomic (c) monoatomic (d) polyatomic
11. Chemical changes around us include all except
(a) rusting of iron nails (b) fading of coloured cloths (c) sieving (d)
decomposing of green leaves in a compost
12. One of these is not a chemical change
(a) rusting (b) sublimation of solids (c) slaking of quicklime (d) fermentation
of glucose.
13. One of these professions has no need for chemistry.
(a) miners (b) engineers (c) philosophers (d) geologists
14. The following are examples of radical except (a) OH– (b) NH 4 + (c) N0 3 – (d) Cl –
15. Which of the following atoms contains the highest number of electrons in the
outermost shell? (a) 8 O (b) 10 Ne (c) 15 P (d) 19 K
16. What is the mass number of an element of its atom contains 10 protons, 10
electrons and 12 neutrons (a) 32 (b) 22 (c) 20 (c) 10
17. In which pair of substances is each substance a mixture?
a. air; water b. limewater; water c. quicklime; limewater d. sea water; air
18. A separating funnel is most useful to separate a. a residue from a solution b. two immiscible liquids c. a solute from a solvent d. two powdered solids
19. Separation of different compounds in paper chromatography depends on the
a. difference in colour b. size of container used c. type of filter paper used
d. relative solubilities of the compounds
20. Which separation technique is used to obtain potassium trioxonitrate(v) from its aqueous solution?
a. electrolysis b. distillation c. chromatography d. crystallisation
21. What property must a mixture of miscible liquids have in order for it to be separated by fractional distillation?
a. the liquids in the mixture must be coloured
b. the liquids in the mixture must have the same densities
c. the liquids in the mixture must have close boiling points
d. the liquids in the mixture must have different boiling points
22. Which is the best method to separate a mixture of lead tetraoxosulphate(vi) and sodium trioxonitrate(v)? a. filtration b. distillation c chromatography d. crystaliisation
23. What is the best method to separate liquid air into its constituents?
a. crystallization b. distillation c. fractional distillation d. chromatography
24. Which ion has the most shells that contain electrons?
a. Al3+ b. Be2+ c. N3- d. S2-
25. Which electron arrangement is that of a metallic element?
a. 2, 1 b. 2, 4 c. 2, 5 d. 2, 7
26. An atom of an element contains 17 protons, 18 neutrons and 17 electrons. What is the atomic structure of another isotope of this element?
| protons | neutrons | electrons | |
| a | 17 | 20 | 17 |
| b | 17 | 18 | 16 |
| c | 18 | 18 | 17 |
| d | 20 | 18 | 17 |
27. Which of the following is a compound?
a. air b. carbon c. oxygen d. steam
28. In which set do the three particles each have the same total number of electrons?
| a | Cl– | Br– | I– |
| b | F– | Ne | Na+ |
| c | K+ | Ca2+ | Br– |
| d | Li+ | Na+ | K+ |
29. An ion X+ has 23 nucleons and 10 electrons. What does the nucleus of the ion X+ contain?
| protons | neutrons | |
| a | 12 | 11 |
| b | 11 | 12 |
| c | 10 | 13 |
| d | 9 | 14 |
30. The table shows information about particles X and Y.
| number of protons | number of neutrons | electronic structure | |
| X | 9 | 10 | 2, 8 |
| Y | 17 | 20 | 2, 8, 8 |
Which statement is correct for both X and Y?
a. they are atoms of metals b. they are atoms of noble gases c. they are isotopes of the same element
d. they are negative ions
31. Isotopes of a given element have the same
(i) atomic number (ii) electronic configuration (iii) chemical properties (iv)mass number
(a) iv only (b) i and iii only (c) iii and iv (d) i, ii and iii
32. The maximum number of quantum number of electrons that can be
accommodated in the shell having the principal quantum number 3 is?
(a) 3 (b) 9 (c) 10 (d) 18 (e) 32
33. In which of the following is the oxidation number of nitrogen zero?
(a) NH 3 (b) NaNO3 (c) HNO 2 (d) N 2 (e) NCl3
34. The oxidation number of phosphorus in PO 4-3 is (a) +1 (b) +2 (c) +3 (d) +4 (e) +5
35. The most suitable method to use when separating an insoluble solid from s
liquid is (a) Evaporation (b) filtration (c) magnetization (d) sublimation (e) distillation
36. A sample of orange juice is suspected to have been contaminated with a
yellow dye. Which of the following methods can be used to detect the dye?
(a) decantation (b) chromatography (c) distillation (d) filtration (e)Evaporation
37. If an element X with the electronic configuration of 2,8,3 combines with
another element Z with electronic configuration 2,8,6, the compound formed
will have the formula (a) XZ (b) XZ 2 (c) X 2 Z (d) X 2 Z 3 (e) X 3 Z 2
38. The __________ is the pure liquid that is obtained after its vapour condenses in the
condenser.
39. Distillation is essentially the process of _______Z___ a liquid and 40. __________ the vapour.
FIRST TERM SS2 CHEMISTRY EXAMINATION QUESTIONS – EDUDELIGHT.COM
ATTEMPT ANY THREE
1a. Use a suitable diagram to show how one state of matter can be converted to another state.
b. Classify the following as either physical or chemical change.
The addition of water to quick lime
The change of wax
The change in colour of Zinc from white to yellow and vice versa when heated and after cooling respectively.
The dissolution of copper in concentrated trioxonitrate(v) acid.
The hardening of cement by the absorption of carbon(iv)oxide.
c. Write the first 10 elements their symbols and their electronic configurations.
2a. Give two examples each of the following:
A monatomic element:
A diatomic element:
b. Give two examples each of:
An element that exists as a solid at room temperature.
An element that exists as a liquid at room temperature.
(iii)An element that exists as a gas at room temperature
c. What is the Latin name and the symbol of the following elements.
i. Gold ii. Lead iii. copper d. Iron
3a. Classify the following substance as either mixture or compound
Soap Table salt Sugar Toothpaste Crude oil
Perfume Limestone Tea Solution Air Milk
Paint Drugs (aspirin) Urea Blood Bronze
Soil Sand Saliva Urine Water
3b. Which separation method would you employ to separate each of the following
mixtures?
Kerosene and water
blood components
sand and iron filings
(iv ) components of crude oil (v ) Ammonium chloride and chalk
(vi) table salt and water (vii) palm oil and water
(viii) components of sea water
(ix) common salt and sand
(x) copper(ii)tetraoxosulphate(vi)crystal and water.
3c. List the postulate of Dalton’s atomic theory.
4a. Calculate the % abundance by mass of the elements with this relative abundances.
i. 31 19 P and 30 19 P and relative atomic mass 30.5
ii. Determine the relative atomic mass of carbon from a sample with the
following data 98.9% of carbon -12 and 1.1% of carbon-13.
4a. Calculate the oxidation state of the elements indicated in the following, bearing in mind the rules for determining oxidation states.
i.K2Cr2O 7 Cr
ii. CuSO4.5H2O S
iii. Na2CO3 .10H2O C
iv.H 2 SO 4 S
v.H 2 SO3 S
4b. State the 3 principles for filling electrons into orbitals
4c. State the factor that determines which liquid distills over first during fractional distillation.
5a. Describe how you can separate ammonium chloride from a mixture of ammonium chloride and sodium chloride.
5b. State the difference between simple and fractional distillation
5c. The solid which remains on the filter paper when a suspension is filtered is called the
__________.
5d. The liquid or solution that passes through the filter paper is called the __________.
5e. Some salts are obtained through crystallisation from a saturated solution while others
are heated and evaporated to dryness. Describe one factor that determines the choice of
method
FIRST TERM SS2 CHEMISTRY EXAMINATION QUESTIONS – EDUDELIGHT.COM
