CHEMISTRY EXAM QUESTIONS FOR SS2 THIRD TERM
SS2 CHEMISTRY EXAM QUESTIONS THIRD TERM – EDUDELIGHT.COM
THIRD TERM EXAMINATION
THIRD TERM
Examination malpractices may lead to a repeat of the subject or suspensions don’t be involved.
SUBJECT CHEMISTRY
CLASS: S. S. S TWO
DURATION 2 HR
1. Water is temporarily hard because it contains
a.CaSO4 b.MgSO4 c .Chlorine d. Ca(HCO3)2
2. The following are characteristics of colloids except
a. tyndal effect on light beam b. solid phase are removed by dialysis c. colloidal particles are larger than that of suspensions
d. colloidal particles are separated using parchment membranes.
3. One of these is not a water pollutant
a. petroleum b. domestic liquid and solid waste c. industrial effluents d. Biodegradable chemicals
4. 144 g of KCl dissolved in 1dm3 of water at 90°C in the presence of excess crystals of KCl. Calculate the solubility of KCl at this temperature.(K=39,Cl=35.5)
a.0.89moldm-3 b.1.93moldm-3 c.1.75 moldm-3 d.1.5moldm-3
5. What is the volume occupied by 2 moles of ammonia at S.T.P?
A. 44.8dm-3 B. 22.4dm-3 C. 11.2dm-3
D. 5.6dm-3
6. Consider the neutralization reaction represented by the following equation:
Na2CO3 + 2HNO3 → 2NaNO3 + H2O + CO2. The stoichiometric ratio of acid to base is
A. 2:2 B. 2:1 C. 1:2 D. 1:1
7. The shape of water molecule is
a. angular b. tetrahedral c. pyramidal d. linear
8. The volume occupied by0.4g of hydrogen gas at S.T.P. is (H=1.00,Molar volume at S.T.P =22.4dm3).
a.2.24dm3 b.4.48dm3 c.22.4dm3 d.8.96dm3
9. Which of the following will not decolourise bromine water?
a.C2H6 b.C2H4 c.C3H4 d.C3H6
10. The gas that can be best collected by downward displacement of air (a) chlorine (b) carbon(iv)oxide (c) sulphur (iv)oxide (d) ammonia
11. Which of the following properties of elements decreases generally across a period in the periodic table? (a) electronegativity (b) electron affinity (c) atomic radius (d) ionization energy.
12. If the electron configuration of an element is 1s22s22p63s23p6,it shows that it is a:
(a)group II element (b) noble gases ( c) group V element (d) group II elements
13.Cr2O-27 + 14H+ + xe – 2Cr3+ + 7H2O
The number of moles(x) of electrons in the above half cell equation is: (a) 2 (b) 4 (c) 7 (d) 6
14. the volume occupied by 0.4g of hydrogen gas at STP is (H=1.00, molar volume at STP =22.4 dm3)
(a) 2.24 dm3 (b) 4.48dm3 (c) 22.4dm3 (d) 8.96 dm3
15. A measure of degree of disorderliness in a chemical system is known as: (a)enthalpy (b) free energy (c) entropy (d) activation energy
16. H2(g)+ x2(g) 2HX(g) ΔH=positive. In the above reaction,a decrease in temperature will:
(a) decrease the concentration of HX
(b) favour the forward reaction
(c) favour the yield HX
(d) have no effect on the equilibrium position
17. 3Fe(s)+4H2O(g) Fe3O4+ 4H2(g) .The equilibrium constant K of the reaction above is represented as:
(a) [H2]4/[H2O]4 (b) [Fe]3 [H2O]4/[Fe3O4] [H2]4 (c)[Fe3O4][H2]4/[Fe]3[H2O]4 (d)[H2]4/[H2]4
18. What is the quantity of electricity produced when a current of 0.5 A is passed for 5 hours 45 minutes (F=96500)? (a)0.11F (b)0.22F (c) 0.12F (d) 1.1F
19. The oxidation number of phosphorus in PO43- : (a) +1 (b) +3 (c) +4 (d) +5
20. Compounds that exists in two or more different structural forms which also differ in chemical or/and physical properties but possess the same molecular formula this is said to exhibit.
(a) Isotopy (b) Isomerism (c) Polymerism (d) allotropy
21. Consider the reaction represented by the following equation:
H-CºC-H X Y; X and Y respectively are
A. ethene and ethane B. ethane and ethene
C. ethyne and ethane D. ethane and propene
22. Compound N reacts with sodium metal to produce a gas that gives a “pop” sound with a burning splint. N also reacts with ethanol to give a sweet smelling liquid. Compound N is an
A. alkanol B. alkanoate C. alkane
D. alkanoic acid
23. A solutions of sodium trioxocarbonate (iv) contains 10.6g in 250cm3 of solution. Calculate the concentration of the solution. [Na2CO3 = 106.0]
A. 0.4mol dm-3 B. 1.0moldm-3
C. 10.6moldm-3 D. 25.0moldm-3
24. The IUPAC name of the compound
CH3 CH3
CH3 – CH – CH – CH3
2,3 – dimethyl pent – 2,3 – one
3,4 – dimethyl pept – 2 – one
2,3 – dimethyl butane
3,4 – dimethyl pentene
25. The alkanoate CH3CH2COOC2H5 is the product of the reaction between:
(a) ethanoic acid and ethanol
(b) ethanoic acid and propanol
(c) propanoic acid and ethanol
(d) propanoic acid and propanol
26. Filling the burette for titration involves these except
a. wash with water b. rinse with acid c. eject air bubbles d. read at eye level
27.The change from the degree of unsaturation to saturation is called ——-reaction.
a .substitution b. addition c. saturation d. fermentation.
28.A carbon hydrocarbons consists of 92.35% carbon. If its vapour density is 39,determine its molecular formular.a.C3H3 b.C6H6 c.CH d.C9H9.
29.What is the IUPAC name of CH3CHClCH2CH2CH3?
a. 2- bromopentane b.2.chloropentane c.2-chlorobutane d.2-dimethyl pentane
30.What is the general reaction that Alkanes, Alkenes and Alkynes undergo.
a.substitution b.combustion c.addition d.fermentation
31. An organic compound decolorized acidified KMno4 Solution but failed to react with ammonia cal silver nitrate solution. The compound is likely to be (a) Alkyne (b) Alkanone (c) Alkene (d) Alkanol
32.Why does ethanol taste sour when exposed to air (a) it undergoes reduction undergoes hydrolysis and tsurns to acid (d) it undergoes oxidation and changes to acid.
33.When water drops are added to calcium carbide in a container and the gas produced is passed through a lighted jet, the resultant flame is called an (a) oxyathlyene flame (b) oxyethyne flame (c) oxyhydrocarbon (d) oxyacethylene flame
34.Which of the following can be written as cylohydrocarbon.
(i) C6H6 (ii) C2H4 (iii) C3H8 (iv) C4H8
(a)I and iv (b) I and iii (c) ii and iv (d) I, iii and iv
35.A palm wine seller stoppered a bottle of his palm wine in his stall an after a few hours the bottle exploded. Which of the following equations represent the reaction that occurred? (a) 2C6H12O6 enzyme C12H22O+ H2Ovapour
(b)2C6 H12O6 enzymes 2C2 H5 OH + 2CO2
© C2H5OH ————-CH2=CH2(g) + H2O
(d) C6 H12O6 enzymes C2 H5 OH + CO
36.The reaction between C2 H4 and the halogen is called _____________ reaction (a) oxidation (b) substitution (c) addition (d) Polymerization
37.The mixing or blending of two or more atomic orbital is know as _______________ (a) Polymerization (b) condensation (c) Hybridization (d) esterification.
38. The IUPAC name of the simplest alcohol is
(a)Methanol(b) ethanol (c)ethyl alcohol (d)methyl alcohol
39.If an organic compound has the following composition , carbon 37.4% and hydrogen 12.4% has empirical formal of C=12 ,H=1,and O =16(a) C2H4O (b) C4 H8 (C) CH4O (d) C2 H4
40.Which of the following organic compound structure is the most soluble in water? (a) CH3-O-CH3 (b) CH3CH2OH (c) CH2=CH2 (d)CH3CH3
41. Propan-2-01 undergoes oxidation reaction to form (a) propan-2-al
(b) Propanioc acid (c) Butan-2-one (d) propanone
42.Which of the following structure will produce sooth or smoke most when burning ________ (a) C4H10 (b) C2H6 (c) C3H4 (d) CH4
43.In a laboratory a student failed to uncover the reagent bottle filed with ethanol, give the reaction which occurred when the ethanol was exposed to air for shorter time before cover. (a) C2H5OH CH3COOH (b) C2H5OH CH3C=O (c) C2H5OH ConcH2SO4 C2H4+H2O (d) C2H5OH CH3-O-CH3
44. Compounds that exists in two or more different structural forms which also differ in chemical or/and physical properties but possess the same molecular formula this is said to exhibit.
(a) Isotopy (b) Isomerism (c) Polymerism (d) allotropy
45.The reversible reaction of esterification is known as (a) Hydrolysis (b)Saponification (c) hygrolysis (d) Transformation
46.Example of secondary alcohol is (a) Ethanol (b) Propan-2-0L (c) 2-methyl propan-2-0L (d) Butan-1-0L
47.Tertiary alcohol is an example of (a) monohydric (b) Trihydric (c) Dihydric (d) Polyhydric
48.What is the catalyst used in reaction below. CH4+Cl2 CH3Cl +HCL
Finely divided Nickel (b) Sunlight
(c) Conc. H2SO4 (d) Platinum
49. If an excess of liquid hydrocarbon is poured into a jar of chlorine and the sealed jar is then exposed for several hours to bright sunlight, all the chlorine gas is consumed. The hydrocarbon is said to have undergone. (a) a polymerization reaction (b) an addition reaction (c) a substitution reaction (d) a reduction reaction
50. The function of conc . H2SO4 in the esterification of ethanoic is to
(a) serve as a dehydrating agent (b) prevent any side reaction (c) act as a catalyst (d) serve as an oxidizing agent.
THEORY
1a. Give the IUPAC names of the structures below
(i) CH3CHCH2 CH2CH2CH3
(a) CH3
(ii) CH3 – CH – CH2 – CH – CH2 – CH3
CH3 C2H5
(iii) CH3C = CCHCH3
CH3
(iv) CH3CH2CH2CH2CH = CH2
b.Write the structural formulae for these compounds (i) C is –pent – 2 – ene
(ii) 2 – methylpent – 2 –ene (iii) 2,2,3 – trimethylbutane (7mks)
c. Using chemical equations, describe two ways of removing each of the following hardness of water. i. temporary hardness of water
ii. permanent hardness of water ( 6mks)
d. Describe the origin of hardness.(2mks)
2a.The solubility of KNO3 at 200C was 3.00mol/dm3. If 67.0g of KNO3 was added to 250cm3 of water and stirred at 200c,determine whether the solution is saturated or not with reasons.(4mks)
b. Define the following terms
i. saturated solution ii. supersaturated solution ( 4mks)
c. Classify the following as colloids, suspension ,aerosols and true solution.
gel, clay, milk, hair cream ,smoke,fog,CuSO4,NaCl (4mks)
d. The solubility of copper(ii) tetraoxosulphate vi at 850c is 60g in 100g and at 150c is 18.8g in 100g.If 120gof solution saturated at 850c are cooled to150c,what mass of copper(ii)sulphate crystals would be deposited?(3mks)
3a.Oxygen gas is sometimes prepared in labs by the thermal decomposition of potassium chlorate(KClO3).The balanced equation is as follows:
2KCl03-2KCl(s)+302(g).
If 5.150g of KClO3 decompose, what volumes of 02 would be obtained at S.T.P?(K=39,Cl=35.5,O=16).(4mks)
b. If 0.8 g of gas z occupies 0.56 dm3 at s.t.p. calculate its relative molecular mass.(molar volume of gas is 22.4dm3).(3mks)
c. Write the equation of combustion reaction of a named alkene.(4mks)
d. Using chemical equations only, highlight the industrial preparation of ethanol by fermentation process.(4mks)
4. a .A solution of trioxonitrate (v) acid contained 0.67g in 100cm3. 31.0cm3 of this solution neutralized 25cm3 of a sodium trioxocarbonate (iv) solution. Calculate the concentration of the trioxocarbonate (iv) solution in mol/dm3.(HNO3=63,Na2CO3=106).(4mks)
b. Two hydrocarbons x and y were treated separately with acidified potassium tetraoxomanganate(vii) solution. x decolorized the solution and y did not. Which of x and y will undergo
i. substitution reaction
ii. both addition and substitution reaction (3mks)
c. Mention two compounds of benzene and draw their structure.(5mks)
d. Why is it that an hydrocarbon give a precipitate with ammoniacal AgNO3 whereas some homologues do not.(3mks)
5a. What happens when few drops of Conc.H2SO4 is added to solution of ethanoic acid and Ethanol? Write the equation of reactions.(4mks)
b. Why is the conversion of ethanol to ethanoic acid an oxidation reaction?( 2mks)
c. ‘‘Saturated hydrocarbons burn with a blue flame while unsaturatedhydrocarbons burn with a sooty flame’’. Why? (4mks)
d.How would you bring about the following conversions? Name the process and write the reaction involved. (a) ethanol to ethene (b) propanol to propanoic acid.(5mks)
SS2 CHEMISTRY EXAM QUESTIONS THIRD TERM – EDUDELIGHT.COM
CLASS: S S 2
SUBJECT: CHEMISTRY
- What is the electronic configuration of sodium?
1S2522P6352 (b)1522522P6352 (c)1522522P6351
(d) 1522522P6350 (e) 1522P63523p6451
2. Which of the following statements is true?
(a)An increase in temperature increases number gas molecules.
(b)Increase in temperature does not affect kinetic energy
(c)Increase in temperature is proportimal to volume
(d) decrease in pressure decrease number of gasmol.
3. An element is said to be electronegative if
a.If is an halogen
b.If is an Alkali earth metal
c.If is an Alkali
4.What is the consequence of increasing the equilibrium reaction? Zn0(g) +theg = Zn (g) + H20(L)
a.Equilibrium is driven to the left
b.Equilibrum is driven to the right
c.There is no effect
d.More Zn0(s) is produces
5. An isotope has an atomic number of 17 and a mass number of 36, which of the following gives the correct number of neutron and protons in an atom of the isotope?
Neutrons Protons
A 53 17
B 17 36
C 19 17
D 36 17
Use this information to answer the following questions
Four elements, P,Q,R,S, have atomic number 4,10,12 AND 14 Respectively.
6.Which is a notable gas a. P B. Q C. R D. S
7.Which is an ALKALI-METAL a. P b. Q C. R d. S
8.Which is an ALKALI- EARTH METAL A. P B. Q C. R D. S
9. The element with electronic configuration 1s2,2S2,2P3 is a. oxygen b. Chlorine c. nitrogen d. calcium
10. How many electron are in L shell a. 2 b. 5 c. 8 d. 16
11. Which of the following reaction is endothermic
a. C[s] + O2 [g] — CO2[g]
b. CaO(s) + H2O(c) → (a{OH]2cs)
c.Ccs = H20 → C0(g) = H2(g)
d. HCIcag) + Na0Hcag) →NaCIcag0 + H20(c)
12.A catalyst speed up the rate of chemical reaction by
a.Taking part in the reaction
b.lowering the activation energy of the reaction.
c.increase the heat content
d.increase the activation energy
13. The electronic configuration of two atoms X and Y are as follows:
X –IS22522P63S2
Y- IS22522P63S23P64S2
Which of the following statement is correct about the position of elements X and Y in the periodic table
a.X belongs to group 1,Y belongs to period 2
b.X belongs to group 1.Y belongs to period 1
c.X belongs to group 2,Y belongs to period 1
d.X belongs to group 3,Y belongs to period 2
14. The electronic configuration 1S2 2S2 2P6 3S2 3P6 is that of a. noble gas b. Group 11 element c.group 3 element d. group vi element
15. Which of the following statements is not correct a. diatomic b. good oxidizing agents c. Highly electronegative d. have high electron affinity
16. An element whose atomic number 19 has the electronic configuration
a. IS22522P63523P7
b.1522522P63523P23P63d1
c.1S22522P63S33P6
d.IS22512P63523P6452
17. Chlorine is used in water treatment as a. a germicide b. decolorizing agent c.an antioxidant d. a coagulating agent
18. The valency of chlorine is a. -1 b. -5 c. -3 d. +1
19. Isotopy is observed in which of the following element a. chlorine b. carbon c. oxygen d. fluorine
20. The position of an element on the periodic table is determined by its a. its density b. its atomic radius c. atomic number d. neutron number
21. What is the molar mass of alkyne with the formula CXH14[H=1 C= 12] a. 86g b.92g c. 98g d. 110g e. 112g
22. Which of the following is not a separation techniques
a.distillation
b.propiation
c. chromatography
d. distillation
23. Which of the following is not an halogen a. silicon b. fluorine c. astatine d. bromine e. iodine
24. An atom X consist of 6 protons, 6 electrons and 7 neutrons, Which of the following representation of atom is correct
(a)136X
(b)137x
(c)196 X
(d)197 X
25.The following atoms of carbon 126C,136C and 146C can be described as a.
allostropes b. isomas c. isotopes d. isotones
26. How many electrons are there in 4Be2+ a. 2 b. 4 c. 5 d. 6
27.An atom of an element X gains two electrons.The symbol of the ion formed is a. X b. X+ c. X2+ D d.X2-
28.In the periodic table,all the elements within the same group have the same.
A.number of neutron
b. number of valency electron
c. numbers of isotopes
d. atomic number
29.In the periodic table,alkaline earth metals can be found in group
a. 1
b. 11
c. vi
d. vii
30.Which of the following instruments is used in detecting the presence of radiation
a. cathode ray tube
b. Greiger-Muller Counter c.
Mass spectrometer
d. X-ray tube
31.Which of the following elements is a metalloid a. carbon b. oxygen c. silicon d. sodium
32.The shape of graphite crystal is a. tetrahydra b. pyramidal c. hexagonal d. octahedral
33.Which of the following ions has the electronic configuration 2,8,8 a. Na+
b.Mg2+ c. F d. Cl—
34.An element with electronic configuration of 1S,2S,2P would have the combining power of a. 0 b. 2 c. 6 d.8
35.Which of the following has the electronic configuration; 1S 2S 2P 3S 3P[Na,Al,N,S] a.0 b. 2 c. 6 d. 8
36.Find the number of neutons in an atom represented by 4621 X
a. 21 b. 24 c. 45 d. 66
37.The activation energy of a reaction can be altered by a. adding reduction agent b. applying a higher pressure c. using a catalyst d. changing the temperature
38.The phenomenon observed when particlesof colloidal solutionblock the part of light rays and scatter them is known as a.diffusion b. tyndal effect c.dialysis d. Brownian movement
39.Which of the following substances causes the depletion of the ozone layer in the atmosphere a. CO2 b. Chloroform carbon c.Sulphur [iv]oxide d. hydrocarbon
40. A consequence of global warming is a. air pollution b. water pollution c. Increased humidity d. Flooding
30.Which of the following instruments is used in detecting the presence of radiation
a. cathode ray tube
b. Greiger-Muller Counter c.
Mass spectrometer
d. X-ray tube
31.Which of the following elements is a metalloid a. carbon b. oxygen c. silicon d. sodium
32.The shape of graphite crystal is a. tetrahydra b. pyramidal c. hexagonal d. octahedral
33.Which of the following ions has the electronic configuration 2,8,8 a. Na+
b.Mg2+ c. F d. Cl—
34.An element with electronic configuration of 1S,2S,2P would have the combining power of a. 0 b. 2 c. 6 d.8
35.Which of the following has the electronic configuration; 1S 2S 2P 3S 3P[Na,Al,N,S] a.0 b. 2 c. 6 d. 8
36.Find the number of neutons in an atom represented by 4621 X
a. 21 b. 24 c. 45 d. 66
37.The activation energy of a reaction can be altered by a. adding reduction agent b. applying a higher pressure c. using a catalyst d. changing the temperature
38.The phenomenon observed when particlesof colloidal solutionblock the part of light rays and scatter them is known as a.diffusion b. tyndal effect c.dialysis d. Brownian movement
39.Which of the following substances causes the depletion of the ozone layer in the atmosphere a. CO2 b. Chloroform carbon c.Sulphur [iv]oxide d. hydrocarbon
40. A consequence of global warming is a. air pollution b. water pollution c. Increased humidity d. Flooding
SS2 CHEMISTRY EXAM QUESTIONS THIRD TERM – EDUDELIGHT.COM
SECTION A
ANSWER ALL THE QUESTIONS IN THIS SECTION
1a, What is the allotropes of carbon
b.Name two products of destructive distillation of coal and state one use of it.
c. a p X r p X
1.Give the relationship between the two atoms
2.state the difference between them
3.what phenomenon is illustrated above
2a.State three types of separation techniques?
(b) Write the electronic configuration of 30Zn
(c)what is the common name given to the group vii elements
3copy and complete this table
| Particles | Number Of Neutrons | Electrons | Protons | Mass Number |
| W2+ | 12 | 24 | ||
| X2+ | 8 | |||
| Y | 13 | 27 | ||
| Z | 12 | 11 |
(b)The electronic configurations 0f atoms of the elements A,B,C,D are as follows:
(A)1S2 2522P2
(b)1S2251
(c)IS22522P1
(d)IS2252
State which of the elements is
(i)Divalent
(ii)Belong to group III the period table
(iii)Is an Alkali earth metal
c. Define isotopy and Allotropy
4. Define the following
(a) Atom (b) Molecule (c)Valency (d)compound
(b) List three differences between chemical and physical change
( C) Differenciate between an acid and Alkali
(5)Write the characteristics of
(i) Electrovalent elements
(ii)Alkali earth metals
(b)State the lechatelier’s principle
(c)State and explain three factors that affect rate of reaction
SECTION C
Answer one question in this part
(6)Define mole, what is a molar solution
(b)State and explain three factors that affect equilibrium
(c)What is Avogadro’s constant
(7)Define relative molecular mass
(b) Write the equilibrium constant for this equation
H2(g) + 02(g→ H20(c)
(c)Define Acid Rain
SS2 CHEMISTRY EXAM QUESTIONS THIRD TERM – EDUDELIGHT.COM
I just went to this Page by faith and I believe God that he will bless my efforts
Thank you for the update
Umuezena umudim