Third Term SS 1 Chemistry 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 1             DURATION 2 HR

OBJECTIVE 

Which of the following substances is covalent compound? Sodium chloride   (b) magnesium sulphide (c) hydrogen chloride (d) potassium nitrate.

2. The components of universal indicator solution can best be separated by: (a) chromatography (b) titration (c) evaporation (d) fractional distillation 

3.The mass of an element is 27 and its atomic number is 13.       what is the composition of the nucleus of its atom?

13 neutrons and14 protons

13 neutrons and 14 protons

13 protons and 14 neutrons

13 electrons and 14 neutrons

How many  unpaired electrons are in the p- orbital of a fluorine atom?(a) 1 (b)2   (c) 3  (d) 0

Two elements X and Y combine to form a formula X2Y3. which of the following representations would fit the configurations of X and Y?

          X                              Y

          2,2                           2,3

          2,6                          2,5

          2,8,2                      2,8,3

          2,8,3                        2,6

Element  X with electronic configuration 2,8,2 and element Y with electronic configuration 2,8,7 are likely to combine by:

Metallic bonding    b) covalent bonding  c) electrovalent bonding    d)  dative bonding. 

Carbon is often deposited in the exhaust pipe of cars because of the  (a) presence of carbon in petrol (b) dehydrogenation of petrol  (c) incomplete combustion of petrol  (d) presence of additives in petrol

The following are heavy chemicals except  

Tetraoxosulphate (VI) acid   (b) caustic soda (c) sodium    trioxocarbonate(VI)  (d) Ethane

Octane numbers is highest in petrol containing  a high proportion of ———-  (a) heptane    (b) octane  (c) 2-methyl pentane  (d) 2,2,4 trimethylpentane 

When the kerosene fraction from petrol is heated at high temperature, a lower boiling  

liquid is obtained. This process is known as  (a) polymerization  (b) refining  (c) hydrogenation (d) fractional distillation

Which of the following statements best explain cracking? It is a process  (a) in which alkene adds on itself repeatedly to form long chain polymer   (b) in which large hydrocarbon  molecules are broken into smaller units   (c) in which carbon results in a zig-zag arrangement  (d) in which aromatic hydrocarbons are produced.

What are the values of x, y and z respectively in the following  equation?                                                                                                   

MnO2(s) + xHCl(aq)  MnCl2(aq)+ YH2(l) + zCl2(g)   (a) 4,1,2 (b)1,2,1  (c) 2,1,2   (d)4,2,1

     13.Boyle’s law can be expressed mathematically as:   (a) V&1/p   b.v1/T1=V2/T2   c.V&T(P constant)   d.P&V(T constant)   e.P&T    

14.Which of the following statements explain why tetraoxosulphate(VI) acid is regarded as a strong acid.

a.it is dibasic  b.it is concentrated c .the acid is completely ionized in aqueous solution   d.the acid is corrosive

15.The number of replaceable hydrogen atom in one molecule of an acid indicates its  a.Basicity   b.Alkalinity   c.Acidity   d.Reactivity

16.which of the following is /are characteristics properties of acids?They  i.form  hydroxonium ions in water  ii.liberate carbon (iv)oxide from trioxocarbonate(iv) salts.  Iii Turn blue litmus paper red.  Iv.have a soapy feel

a.iv only   b.i and ii  c.iii and iv  d.  I ,ii,and iii

17.The following acid are monobasic except a.Trioxonitrate(v)acid   b.Hydrochloric acid  c.Ethanoic acid  d.Tetraoxosulphate (v)acid

18.An acid is a substance which in the presence of water produces

A.salts   b.Oxygen  c.Effervescence  d.Hydroxonium ions

19.Which of the following is an acid salt?

a.(NH4)2CO3  b.CH3COONa  c.KHSO4  d.MgSO4

20.The general methods of preparing salts include

 I .neutralization   ii.precipitation  iii.double decomposition 

Iv action of an acid on a metal

A.iv only  b.i and ii  c.iii and iv  d.i ,ii,iii,and iv

21.Alums are classified as

a.basic salts  b.acid salts  c.anhydrous salts  d.double salts

22.The following salts will produce gas on reacting with hydrochloric acid exceot a.CuSO4  b.CaCO3   c.FeS   D.K2CO3

23.Which of the following methods is good for the preparation of an insoluble salts?

A.action of an acid on a metal   b.double decomposition  c.neutralisation  d.action of an acid on an oxide

24.Which of the following conclusion about solution of pH4 is correct

a.it contains more OH– than H3O+

b.its POH value will be 10

c.it is more acidic than a solution of pH2

d.its hydrogen ion concentration is 4.0 x10 -2

25. Acheson process is a process of producing 
26. graphite from coke at high temperature  b. producing coke using graphite at high temperature  c. anthracite from carbon   d. wood-charcoal from coal.
27. One of these is not a reaction of charcoal

a.C +O2͢ CO2   b.CO2+C͢ 2CO   c.2CO+O2͢  2CO2    d.CO2+2CO͢ 2CO

27. Kipp’s apparatus is an instrument  for preparing intermittent supply of gases by reacting    a. liquid with gas   b. liquid with solid   c. solid with gas d.liquid with liquid
28. Gas which dissolves in ammoniacal copper I chloride but insoluble in water is   a. NH3   b.CO   c.N2O   d.CO2
29. Fine chemicals  have the following characteristics except
30. they are chemically pure   b. they are produced by batch process   c. they are produced in large quantity because of high applicability.
31. they are produced in small quantity because of limited applicability.
32. Exceptional large number of carbon compounds is essentially due to the ability of   a. carbon to  catenate liberally   b. various groups to catenate   
33.   Nitrogen, Hydrogen, phosphorus and the Halogens to catenate with themselves
34. Hydrocarbons to dominate other groups.

31.Universal indicator is added to a colourless solution and turns dark blue. What does this tell you?

a.It is an acid   b. It is neutral    c.It is an alkali 

32.Which ion is present in all acid solutions? 

1. Hydrogen ion, H+   b. Hydroxide ion, OH–   c. Hydride ion, H–

33.What name is given to a base that dissolves in water?

1. Amphoteric    b . An alkali     c. A salt 
2. Which ionic equation takes place in an acid-alkali neutralisation reaction? 
3. H+ + OH– → H2O   b. HCl → H+ + Cl–     c.NH3 + H2O → NH4+ + OH–
4. Which of the following could be used to neutralise acidic soil? 

Sodium chloride   b. Calcium oxide      c. Sulfuric acid 

36. Sulfuric acid + magnesium oxide →… 
37. Magnesium sulfate + carbon dioxide + water   b. Magnesium sulfate + hydrogen    c. Magnesium sulfate + water 
38. Which of these options would produce potassium nitrate?

Sodium hydroxide and sulfuric acid     b. Potassium carbonate and hydrochloric acid    c. Potassium hydroxide + nitric acid 

38. Which acid is used to make salts that have names ending in sulfate? 

Sulfamic acid       b. Nitric acid    c. Sulfuric acid 

39. What ion is present in nitric acid? 

NO3–     b. NH4+   c. OH–

40. Zinc oxide + nitric acid →… 

Zinc nitrate + water   b. Zinc chloride + hydrogen   c. Zinc nitrate + water + carbon dioxide 

41. Which two chemicals could you react to make ammonium chloride? 
42. Ammonium hydroxide and hydrochloric acid     b. Ammonia and sulfuric acid      
43. Potassium hydroxide and nitric acid 

42.Calcium carbonate + hydrochloric acid →… 

a.Calcium chloride + hydrogen    b.Calcium chloride + water + carbon dioxide

1. Calcium sulfate + water

43.Which of these salts is most likely to be soluble? a. Potassium nitrate  b. Iron carbonate c. Copper oxide

44.What is the name of the precipitate made from the reaction between silver nitrate and sodium chloride? 

Sodium nitrate      b. Silver chloride   c. Water 

45.When producing a soluble salt in a reaction between an acid and an alkali, how can you prepare dry solid crystals from the solution? 

a.Filtration      b.Chromatography     c. Evaporation 

46.When performing an acid-alkali titration, what piece of apparatus is used to place a fixed volume of the first solution into the conical flask? 

Burette       b. Pipette      c. Beaker 

47.When processing titration results, what do you do with results that are very close together?  

a.Take an average   b . Ignore them    c. Pick one

48.The following  can be obtained directly from the destructive distillation  of coal except

a.ammoniacal liquor  b.coke   c.producer gas  d.coal tar

49.The use of diamond in abrasives is due to it’s  a. high melting point   b. durability  c. lustre   d. hardness  e. octahedral shape

50.The liquid product of the destructive distillation of coal is a. kerosene  b. ethanol   

1. ammoniacal liquor  d. paraffin oil 

THEORY

ATTEMPT ANY THREE

1a.How would you prove that a given colourless  liquid is  an acid?

1. Sulphur(iv) oxide is described as an acid anhydride. Elaborate on this statement.

c.Give the natural sources of the following organic Acids.

1. Lactic acid   ii Ascorbic  acid   iii  Amino acids

2a. Give four general methods of preparing salts and use chemical equations for the examples.

2b. How would you prove that sodium Hydroxide is a base without using litmus paper and indicator to test? Equation of reaction required.

2c. The concentration of H+ in a solution is 1×10-3 mol/dm3,what is the PH  of the solution.

3a.Explain why Graphite is a good conductor of electricity while Diamond is not.

3b.Why is carbon(ii)oxide poisonous?

3c.Which properties of carbon(iv)oxide account for its use in fire extinguishers?

4a.Name four products obtained in the destructive distillation of coal.

4b.Write a short note on the preparation and uses of producer Gas.

4c.What happens when dilute acids reacts with trioxocarbonates. Use chemical equations to support your answer.

5a.State the products of fractional distillation of crude oil in increasing order of boiling points.

5b.Differentiate between heavy chemicals and fine chemicals and state two examples each.

5c.What are Hydrocarbons. Give  2 examples.