Chemistry Exam Question For Senior Secondary School (III) Students

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TERM:FIRST TERM
CLASS:SS3
SECTIONA
1.  Which of the following can be obtained by fractional distillation? (a) Nitrogen from liquid air(b)sodium chloride from sea water (c)iodine from a solution of iodine in carbon tetrachloride (d)sulphur from a solution of sulphur in carbon disulphide
2.  A given quantity of a gas occupies a volume of 228cm3 at a pressure of 750mmhg. What will be  its volume at atmospheric pressure (a)
220cm3 (b)225cm3 (c)230cm3 (d)235cm3
3. A base that is soluble in aqueous solution is termed  (A)Acid B)  Alkalis     C)  salt D)  Crystals
4.The group 7 elements are generally nick-named as (a)alkali metals (b) aline earth metals (c)noble gases (d)halogens
5.The variation of the physical and chemical properties of element both across the period and down the group of the periodic table is termed? (A) Periodicity (B) Periodic law (C) Periodic table (D) Periodic moment
6.     Oxidation and reduction reaction occurs together because of _____
7.     The valency of Oxygen atom in a neutral state is (A) -2 (B)+2 (C)2 (D)1
8.     How many Valence electrons are found in the outermost shell of Chlorine atom (A) 17 (B)10 (C)7 (D)70
9.  Elements in the same group in the periodic table possess (A) Variable oxidation state
(B) Similar chemical and physical properties (C)The same number of octet configuration (D)The same number of ionic electrosphere
10.  Determine the Oxidation state of Sulphure in SO42-  (A) -6 (B) +5 (C)+6 (D)3
11.    Pipette and burette are the only two apparatus used for conducting titration experiment __true or false
 12.   The electronic configuration of an element is 287, how many unpaired electrons are they (a)4 (b)5 (c)2 (d) none of the above
13.   The colour of blue litmus paper in an Acid medium is (A) Red (B) Blue (C) Purple(D) Pink
14. The energy required to remove the most loosely bounded electron from the outermost shell of a gaseous atom is termed________
15.The structure of 1-chloro-2-methylhexane is ______________
16.A current of 1.5A is passed for 4.0hours through a molten tin salt and 13.3g of tin is deposited, what is the oxidation state of the metal in the salt?
(a) 1 (b) 2 (c)3 (d)4
17.How many structural isomers can be written for alkyl bromide C4H9Br
(a) 3 (b)4 (c)6 (d)8
18.The carbon atom in ethane is __________________hybridized
19. The shape of ammonia molecule is __________________
20. The noble gas, Argon is used for ________
21.The allotrope of carbon used in the decolourization of sugar is____(a)graphite (b)soot (c)charcoal(d)lampblack
22.The mass of silver deposited  when a
current of 2.6A is passed through a solution of a silver salt for 70minute(Ag=108 ) (a) 10g (b) 20g (c) 12.67g (d) 12.22g
23.25cm3 of a sample of hydrogen gas weighs 0.0225g at stp. 25cm3 of sulphur(vi) oxide gas weighs 0.9g under the same conditions, what is the vapourdensity of sulphur (vi) oxide gas
(a)80 (b)44 (c)41 (d) all of the above (e)none of the above
24.How many times is the rate of diffusion of hydrogen faster than that of oxygen (H=1, O=16)___________
25.What is the final concentration if 500cm3 of 0.5mol/dm3 solution of NaOH is diluted to 1200cm3__________?
26.Bees inject chemical substances when they sting. Which of the following chemical could be used to treat bee stings (a) CH3COOH (b) NaHCO3
(c)C2H5OH (d) H2O2
27.The two gas notable for the formation of acid rain is _________ and _______
28.A is 0.05 mol/dm3 of H2SO4. B is a sodium
trioxocarbonate (IV) solution. If 37.5cm3 of the acid was required to neutralize 25cm3 of the trioxocarbonate, what is the concentration of B in mol/dm3
29.A solution with a known and accurately determined  concentration is termed ________
30. The colour and smell of NO2 is (a) Reddish and irritating (b) Redish brown and pungent (c) Pale blue (d) greenish yellow
31.Ammonia gives dense white fumes with _____________
32______________ and  ___________________
are the common test for  chlorine gas
32.what mass of anhydrous sodium trioxocarbonate (iv), present in 500cm3 of 0.1mol/dm3 (a)10.6g (b)212g (c)5.3g (d)106g
33.filling the burette for titration involves the following except (a) wash with water (b) rinse with acid (c) eject air bubbles (d) read at eye levels
34.The solution produced in the conical flask after each titration is clled (a)titration mixture (b) aliquot mixture (c) salt mixture (d) effluent mixture
35.The flow of electric current in electrolysis is due to the movement of
_______
36.  The factors that influence the preferential
discharge of ions during electrolysis is ____, ____________ and ____________
37.Theempirical formular of C6H6 is ___________(a)CH (b)C2H4(C)C4H (d) All of the above
38.The percentage composition by mass of Nitrogen in NaNO3 is ________
39.One faraday is equal to (a) 9650000C (b) 9650C (C) One mole of electrons
40.Sulphur (IV) oxide bleaches by (a) reduction (b) oxidation (c) hydration (d)adsorption
41.The functional group of esters is __________________
42.Oil deposit in Nigeria  are (a) On land and offshore (b) Only offshore (c) mainly imported (d) downstream
43.________________fractions distills at temperature range between 200oc
-250oC
44.The ability for chemical substance to dissolve in aqueous solutions to produces ions is termed (a) Ionizzation (b) ionic potential (c) ionization
(d) periodicity
45.Oil- bearing rocks layers are located by the following except(a) aerial photography (b) core drilling (c) all of the above (d) none  of the above.
46. The atomicity of Ozone is (a) 3 (b)2 (c)6 (d) none of the above
47. Ethyne burns in air to give a very smoky and ______________ flame
48. HCOOH is the IUPAC name for _________________
49.____________metal is liquid and has a melting point of -39oc
50. Why does some element have their relative molecular masses in decimal and fractions?
Theory:Answer all questions
1.    State faradays first and second law of electrolysis
b. Write short notes on Electrolysis and electrolytic cells
2.    Write short notes on (a) cracking(b) octane number and (c) petrochemicals
B.identify three gases and illustrates means of conducting test for each
3.
A is a solution of HCL containing
7.30 g/dm3. B is a solution of X2CO3 containing 10.6g/dm3. Put A in a burette and titrate against 20.0cm3 portions of B using methyl orange indicator. Tabulate your burette readings and calculate the volume of acid used. The equation for the reaction is X2CO3+ 2HCL——————2XCl +H20 +CO2, from the result determine
(i)  Concentration of A in mol/dm3
(ii) Concentration of B in mol/dm3
(iii) Molar mass of X2CO3
(HCl= 35.5g/mol)
Take the end point to be 21.10cm3
4.  Identify two reagents used in testing for the presence of cations
b. Carry out a test to show the presence SO42- ions
c. state what you will see on bubbling CO2 is bubbled through lime water
5. Credit will be given for strict adherence to the
instructions for observations precisely recorded and for accurate inferences.
All test, observations and inferences must be clearly stated.
C is a mixture of two salts. Carry out the following
exercises on c and record your observation.


TEST
OBSERVATION
INFERENCES
C + Water mixture filtered
Partially dissolves /colourless filtrate
Filtrate + Litmus paper
(B).i. filterate + dil.HNO3Solution+ AgNO3
Cl- present
(ii) mixture in (b)(i)+ excess NH3
PPt dissolves
(c)  Residue +
Dil.HNO3
CO2 evolved
(d) (i) first portion + dil. HNO3 in drops
then in excess
(ii) second portion+ dil.HCl
Pb+ may be present
Pb+  present
Pb+ confirmed.

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