2009 NECO Chemistry Past Questions & Answers

Question 1

In the electrolysis of dilute tetraoxosulphate (VI) acid using platinum electrodes, the products obtained at the anode are cathode respectively are

Accepted Answer

C. oxygen, hydrogen

Answer

A. hydrogen, oxygen

Answer

B. Hydrogen, tetraoxosulphate (VI) ion

Answer

D. sulphur, hydrogen

Answer

E. sulphur, oxygen

Question 2

All the following belong to the same family EXCEPT

Accepted Answer

A. glycerol

Answer

B. nylon

Answer

C. perspex polyethene

Answer

D. polyethene

Answer

E. polystyrene

Question 3

$ ^{235}_{92}U + ^1_0n → ^{145}_{56}Ba + ^{88}_{36}Kr + 3^1_0n + Energy $ The equation above represent a/an

Accepted Answer

C. nuclear fission

Answer

A. alpha particle emission

Answer

B. endothermic reaction

Answer

D. nuclear fusion

Answer

E. thermal dissociation

Question 4

Which of the following gases is absorbed from the air due to photosynthesis?

Accepted Answer

B. Carbon (IV) oxide

Answer

A. Carbon (II) oxide

Answer

C. Nitrogen

Answer

D. Noble gases

Answer

E. Oxygen

Question 5

What kind of bond exist between carbon and oxygen in C03 2-?

Accepted Answer

B. covalent

Answer

A. Co- ordinate Covalent

Answer

C. Electrovalent

Answer

D. Metallic

Answer

E. Van der Waal forces

Question 6

Non-polar molecules are held together by

Accepted Answer

E. Van der Waals forces

Answer

A. co-ordinate bond

Answer

B. covalent bond

Answer

C. electromagnetic force

Answer

D. hydrogen bond

Question 7

Which of the following non-metals reacts most readily with metals?

Accepted Answer

B. Chlorine

Answer

A. Carbon

Answer

C. Nitrogen

Answer

D. Phosphorus

Answer

E. Sulphur

Question 8

What volume of carbon (IV) oxide in dm 3 is produced at s.t.p. when 2.50g of CaCO3 reacts with excess acid according to the following equation? CaCO3(s) + 2HCI(aq) → CaCl2(aq) + H2O(1) + CO2(g) [CaCO2 100; molar volume of a gas at s.t.p. = 22.4dm 3]

Accepted Answer

B. 0.56

Answer

A. 0.28

Answer

C. 2.24

Answer

D. 5.6

Answer

E. 11.2

Question 9

Which of the following equations is NOT balanced?

Accepted Answer

B. CU(S) + HNO3(aq) → Cu(NO3)2(aq) + 4H2O(I) + NO(g)

Answer

A. CH4(g) + 202(9) → CO2(g) + 2H2O(g)

Answer

C. 2KCIO3(s) → 2KCI(s)+ 3O2(g)

Answer

D. NaH(s) + H2O(1) → NaOH(aq) +H2(g)

Answer

E. Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2NaCl(aq)

Question 10

The furring of kettles and boilers are caused by

Accepted Answer

B. calcium hydrogen trioxocarbonate (IV)

Answer

A. calcium hydroxide

Answer

C. calcium trioxocarbonate (IV)

Answer

D. calcium tetraoxocarbonate

Answer

E. magnesium tetraoxocarbonate (VI)

Question 11

What mass of copper in gram would be deposited by a current of 1.00ampere passing for 965 seconds through copper(II) tertraoxosulphate (VI) solution? [Cu 63.5; If = 96500c]

Accepted Answer

A. 0.32

Answer

B. 0.64

Answer

C. 3.18

Answer

D. 6.35

Answer

E. 9.65

Question 12

The relationship between equilibrium constant and free energy change is represented as

Accepted Answer

B. δG °-RT ln K

Answer

A. δ G ° =-nFE °

Answer

C. δ G °= + RT In k

Answer

D. δG ° = δH – T S

Answer

E. H=TδS

Question 13

Which of the following is a solid at room temperature?

Accepted Answer

E. Iodine

Answer

A. Argon

Answer

B. Bromine

Answer

C. Chlorine

Answer

D. Fluorine

Question 14

Atomic size decreases

Accepted Answer

A. across a period from left to right

Answer

B. across a period from right to left

Answer

C. diagonally down the group

Answer

D. down a group

Answer

E. with decrease in atomic number

Question 15

The green house effect is a climatic condition associated with the presence of excess

Accepted Answer

B. carbon (IV) oxide

Answer

A. carbon (II) oxide

Answer

C. hydrogen sulphide

Answer

D. nitrogen (II) oxide

Answer

E. oxygen

Question 16

Two elements X and Y with electronic configurations 2,8,2 and 2,8,7 respectively, are likely to combine by _________bonding

Accepted Answer

C. electrovalent

Answer

A. covalent

Answer

B. dative

Answer

D. hydrogen

Answer

E. metallic

Question 17

The percentage composition of a hydrocarbon is 79.2 carbon 20.8 hydrogen. Calculate its empirical formula [H = 1, C = 12]

Accepted Answer

B. CH3

Answer

A. CH

Answer

C. CH4

Answer

D. C2H2

Answer

E. C2H6

Question 18

The empirical formula of a hydrocarbon containing 0.12 mole of carbon 0.3 mole of hydrogen is

Accepted Answer

A. CH2

Answer

B. CH3

Answer

C. C2H2

Answer

D. C2H4

Answer

E. C2H6

Question 19

Ptotal = P1 + P2 + P3 +…………. Pn, is an expression of law

Accepted Answer

C. Dalton’s

Answer

A. Boyle’s

Answer

B. Charles’

Answer

D. Graham’s

Answer

E. Gay Lussac’s

Question 20

Which of the following metals is NOT extracted by electrolysis?

Accepted Answer

C. iron

Answer

A. Aluminium

Answer

B. Calcium

Answer

D. Magnesium

Answer

E. Sodium

Question 21

The rate of a reaction usually increases with increase in the concentration of reactants because the

Accepted Answer

C. particles of the reactants gain energy and move faster

Answer

A. distance between particles of the reactants increases

Answer

B. frequency of collision of particles is lower

Answer

D. reactants from a complex which decomposes rapidly

Answer

E. reactants occupy a higher energy level

Question 22

Sulphur has an oxidation number of +4 in

Accepted Answer

D. Na2SO3

Answer

A. H2S

Answer

B. H2S04

Answer

C. MgSO4

Answer

E. S03

Question 23

C$_6$H$_{12}$O$_6$ What is the molar mass of the compound above? [ H=1, C=12, O=16 }

Accepted Answer

C. 180

Answer

A. 45

Answer

B. 61

Answer

D. 123

Answer

E. 244

Question 24

Which of the following gases will bleach moist litmus paper?

Accepted Answer

A. Cl2

Answer

B. CO2

Answer

C. HCl

Answer

D. N2O

Answer

E. SO3

Question 25

A neon atom is chemically nonreactive because

Accepted Answer

C. the outer electron shell is completely filled

Answer

A. the electrons at the outermost shell is partially filled

Answer

B. the number of protons equals the number of electrons

Answer

D. there are equal number of protons and neutrons in its nucleus

Answer

E. there are no elections at the outermost shell

Question 26

When air is passed through alkaline pyrogallol and then lime water, the gases left are

Accepted Answer

B. nitrogen and noble gases

Answer

A. nitrogen and carbon (IV) oxide

Answer

C. nitrogen and oxygen

Answer

D. nitrogen, carbon (VI) oxide and noble gases

Answer

E. the noble gases

Question 27

How many atoms of chlorine are required to saturate the double bonds of a compound containing a triene?

Accepted Answer

E. 6

Answer

A. 2

Answer

B. 3

Answer

C. 4

Answer

D. 5

Question 28

The Ideal Gas Law is expressed mathematically as

Accepted Answer

C. PV =nRT

Answer

A. P1 /T1 = P2/T2

Answer

B. P1/V1 = P2V2

Answer

D. PV =KT

Answer

E. V1/T1 = V2/T2

Question 29

During the extraction of iron in the blast furnance, slag is produced using

Accepted Answer

C. limestone

Answer

A. carbon

Answer

B. crylite

Answer

D. oxygen

Answer

E. sulphur

Question 30

The following compounds decolorize acidified potassium tetraoxomanganate (VII) solution EXCEPT

Accepted Answer

A. HOCH2 – CH2OH

Answer

B. H2C –C =C– CH3

Answer

C. H3C – HC = CH2

Answer

D. H2C = CH2

Answer

E. H3C – C =CH

Question 31

The following equations represent redox reactions EXCEPT

Accepted Answer

A. Ba2+(aq) + SO2-4 (aq) → BaSO4(s)

Answer

B. Cl2(g) + 2Br- (aq) → 2CI - (aq) + Br2(g)

Answer

C. Fe2+(aq) + ½ C I2(aq) → Fe3+ (aq) + CI-(aq)

Answer

D. 2Fe3+(aq) + Sn2+(aq) → 2Fe2+(aq) Sn4+ (aq)

Answer

E. Zn(s) + CU2+(aq) → Zn2+(aq) + CU(s)

Question 32

Which of the following compounds will undergo thermal dissociation?

Accepted Answer

E. NH4CI

Answer

A. AgCl

Answer

B. CaCO3

Answer

C. K2S04

Answer

D. NaOH

Question 33

The reaction of an alkanol with alkanioc acid is known as

Accepted Answer

B. esterification

Answer

A. dehydration

Answer

C. halogenation

Answer

D. hydrogenation

Answer

E. saponification

Question 34

Which of these compounds has the greatest ionic character?

Accepted Answer

D. CsF

Answer

A. AlF3

Answer

B. BF2

Answer

C. CF4

Answer

E. NaF

Question 35

The scientist who discovered the zig-zag movement of gas molecules is

Accepted Answer

A. Brownian

Answer

B. Dalton

Answer

C. Gay Lussac

Answer

D. Graham

Answer

E. Newton

Question 36

Compound with the general formula CnH$_{2n+2}$ belong to the_______ group

Accepted Answer

B. alkane

Answer

A. alkanal

Answer

C. alkanoate

Answer

D. alkene

Answer

E. alkyne

Question 37

The following are ores of metals EXCEPT

Accepted Answer

C. graphite

Answer

A. bauxite

Answer

B. dolomite

Answer

D. haematite

Answer

E. magnetite

Question 38

A colourless gas with characteristics odour which dissolves in water to form an alkaline solution is

Accepted Answer

A. ammonia

Answer

B. carbon(IV)oxide

Answer

C. hydrogen chloride

Answer

D. sulphur (IV) oxide

Answer

E. sulphur (VI) oxide

Question 39

If the volume of a gas at 35°C is 60cm3, what would be its volume in cm3 at 273k?

Accepted Answer

C. 53.18

Answer

A. 39.03

Answer

B. 46.81

Answer

D. 67.69

Answer

E. 76.92

Question 40

X = - log10 H+] What does X stand for in the expression above?

Accepted Answer

A. Degree of acidity

Answer

B. Enthalpy change

Answer

C. Equilibrium constant

Answer

D. Ionic product of water

Answer

E. Solubility product

Question 41

The process involved in the decomposition of sugar by an enzyme is called

Accepted Answer

C. fermentation

Answer

A. dehydration

Answer

B. esterification

Answer

D. polymerization

Answer

E. saponification

Question 42

Which of the following salt solutions will have a pH greater than 7?

Accepted Answer

C. Na2CO4

Answer

A. NaCl

Answer

B. NaHSO4

Answer

D. Na2SO4

Answer

E. MgCl2

Question 43

Which of the following statements is NOT correct of group VII elements? They

Accepted Answer

E. have relatively low ionization potentials

Answer

A. are diatomic

Answer

B. are good oxidizing agents

Answer

C. are highly electronegative

Answer

D. have high electron affinity

Question 44

How many zones are present in a luminous Bunsen burner flame?

Accepted Answer

A. 2

Answer

B. 3

Answer

C. 4

Answer

D. 5

Answer

E. 6

Question 45

Which of the following is NOT a fraction of petroleum?

Accepted Answer

B. Coal

Answer

A. Bitumen

Answer

C. Diesel

Answer

D. Kerosene

Answer

E. Petrol

Question 46

Brain tumors can be located by using an isotope of

Accepted Answer

C. technetium 99

Answer

A. carbon - 14

Answer

B. iodine 131

Answer

D. uranium235

Answer

E. uranium 238

Question 47

A salt which loses its mass when exposed to air is

Accepted Answer

C. Efflorescent

Answer

A. deliquescent

Answer

B. effervescent

Answer

D. fluorescent

Answer

E. hygroscopic

2009 NECO Chemistry Past Questions

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