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Unified Tertiary Matriculation Examination Chemistry 2000


1:

A mixture of iodine and sulphur crystals can be seperated by treatment with

A:

water to filter off sulphur

B:

carbon (IV) sulphide to filter off iodine

C:

ethanoic acid to filter off sulphur

D:

methanol to filter off iodine

E:

No option

View Solution

2:

Sieving is a technique used to seperate mixtures containing solid particles of

A:

small sizes

B:

large sizes

C:

different sizes

D:

the same size

E:

No option

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3:

Which of the following compounds is composed of Al, Si, O and H ?

A:

Epsom salt

B:

Limestone

C:

Clay

D:

Urea

E:

No option

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4:

50cm3 of carbon (II) oxide was exploded with 150cm3 of air containing 20% oxygen by volume. Which of the following reactants was in excess?

A:

Carbon (II) Oxide

B:

Carbon (IV) Oxide

C:

Oxygen

D:

Nitrogen

E:

No option

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5:

How many moles of HCL will be required to react with potassium heptaoxodichromate (VI) to produce 3 moles of chlorine?

A:

14

B:

12

C:

11

D:

10

E:

No option

View Solution

6:

The ratio of the initial to the final pressure of a given mass of a gas is 1:1.5. Calculate the final volume of the gas if the initial volume was 300 cm3 at the same temperature

A:

120cm3

B:

200cm3

C:

450cm3

D:

750cm3

E:

No option

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7:

The partial pressure of oxygen in a sample of air is 452mmHg and the total pressure is 780 mmHg. What is the mole fraction of oxygen?

A:

0.203

B:

0.579

C:

2.030

D:

5.790

E:

No option

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8:

The fundamental difference between the three states of matter is the

A:

shape of their particles

B:

number of particles in each state

C:

shape of the container they occupy

D:

degree of movement of their particles

E:

No option

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9:

Which of the following statements is true about the periodic table?

A:

Elements in the same period have the same number of valence electrons

B:

The valence electrons of the elements in the same period increases productively across the period

C:

Elements in the same group have the same number of electron shells

D:

The non-metallic properties of the elements tend to decrease across each period

E:

No option

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10:

The electron configuration of 22X2+ ion is

A:

1s22s22p63s23p64s23d2

B:

1s22s22p63s23p64s23d1

C:

1s22s22p63s23p6

D:

1s22s22p63s23p64s2

E:

No option

View Solution

11:

Which of the following types of bonding does not involve the formation of new substance?

A:

Metallic

B:

Covalent

C:

Co-ordinate

D:

Electrovalent

E:

No option

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12:

The knowlege of half life can be used to

A:

create an element

B:

detect an element

C:

split an element

D:

irradiate an element

E:

No option

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13:

The shapes of CO2, H2O and CH4 respectively are

A:

bent, linear and tetrahedral

B:

bent, tetrahedral and linear

C:

linear, bent and tetrahedral

D:

tetrahedral, linear and bent

E:

No option

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14:

The distance between the nuclei of chlorine atoms in a chlorine molecule is 0.194mm. The atomic radius of chlorine atom is

A:

0.097mm

B:

0.194mm

C:

0.388mm

D:

2.388mm

E:

No option

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15:

The noble gas, argon is used for

A:

electric arc welding

B:

welding brass

C:

underwater welding

D:

steel welding

E:

No option

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16:

A side effect of soft water is that

A:

it gives offensive taste

B:

exess calcium is precipitated

C:

it attacks lead contained in pipes

D:

it encourages the growth of bacteria

E:

No option

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17:

Water molecules can be ligands especially when they are bonded to

A:

alkaline earth metals

B:

alkali metals

C:

transition metals

D:

group VII elements

E:

No option

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18:

The air pollutant unknown in nature is

A:

NO

B:

CO

C:

HCHO

D:

DDT

E:

No option

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19:

1.0dm3 of distilled water was used to wash 2.0g of a precipitate of AgCl. If the solubility product of AgCl is 2.0 times 10^{-10}mol2dm-6, what quantity of silver was lost in the process?

A:

2.029 times 10^{-3}mol dm-3

B:

1.414 times 10^{-3} mol dm-3

C:

2.029 times 10^{-5} mol dm-3

D:

1.414 times 10^{-5} mol dm-3

E:

No option

View Solution

20:

Hydration of ions in solution is associated with

A:

absorption of heat

B:

reduction of heat

C:

conduction of heat

D:

liberation of heat

E:

No option

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21:

The diagram above is the solubility curve of a solute, X, Find the amount of X deposited when 500cm3 of a solution of X is cooled from 60oC to 20oC

A:

0.750 mole

B:

0.950 mole

C:

2.375 moles

D:

4.750 moles

E:

No option

View Solution

22:

HCL_{aq} + H_{2}O_{I} rightleftharpoons H_{3}O^{+}_{aq} + CL^{-}_{aq}

In the reaction above, CL-aq is the

A:

conjugate acid

B:

acid

C:

conjugate base

D:

base

E:

No option

View Solution

23:

In which order are the following salts sensitive to light?

A:

Agl > AgCl > AgBr

B:

AgCl > Agl >AgBr

C:

AgBr > AgCl > Agl

D:

AgCl > AgBr >Agl

E:

No option

View Solution

24:

The pOH of a solution of 0.25 mol dm-3 of hydrochloric acid is

A:

12.40

B:

13.40

C:

14.40

D:

14.60

E:

No option

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25:

MnO4(aq) + 8H+(aq) + Y --> Mn2+(aq) + 4H2O(I)

Y in the equation above represents

A:

2e-

B:

3e-

C:

5e-

D:

7e-

E:

No option

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26:

frac{1}{2}Zn^{2+}_{(aq)} + 8H^{+}_{(aq)} + e^{-} rightarrow frac{1}{2} Zn_{(s)}

In the reaction above, calculate the quantity of electricity required to discharge zinc.

[F = 96 500 C mol-1]

A:

0.965 times 10^{4}C

B:

4.820 times 10^{4}C

C:

9.650 times 10^{4}C

D:

48.200 times 10^{4}C

E:

No option

View Solution

27:

Given that M is the mass of substance deposited in an electrolysis and Q quantity of electricity consumed, then Faraday's law can be written as

A:

M = frac{Z}{Q}

B:

M = frac{Q}{Z}

C:

M = frac{Z}{2Q}

D:

M = QZ

E:

No option

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28:

0.46g of ethanol when burned raised the temperature of 50g of water by 14.3K. Calculate the heat of combustion of ethanol.

[C = 12, O = 16, H = 1, Specific heat capacity of water = 4.2 j g-1 K-1]

A:

+3000 kJ mol-1

B:

+300 kJ mol-1

C:

-300kJ mol-1

D:

-3000kJ mol-1

E:

No option

View Solution

29:

Powdered marble reacts faster with hydrochloric acid solution than the granular form because the powdered form has

A:

more molecules

B:

more atoms

C:

larger surface area

D:

relatively large mass

E:

No option

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30:

The graph that describes a zero order reaction is

A:

coming

B:

coming

C:

coming

D:

coming

E:

No option

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31:

N_{2(g)} + O_{2(g)} rightleftharpoons 2NO_{(g)}; Delta H = + 180.6kJ mol^{-1}

In the reaction above, increase in temperature will

A:

increase the quantity of N2

B:

increase the yield of NO

C:

decrease the yield of NO

D:

decrease the yield of O2

E:

No option

View Solution

32:

For a reaction in equilibrium, the species involved in the equilibrium constant expression are

A:

gaseous and solid species

B:

liquid and solid species

C:

solid and dissolved species

D:

gaseous and dissolved species

E:

No option

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33:

A phenomenon where an element exists in different forms in the same physica state is known as

A:

isomerism

B:

amorphism

C:

allotropy

D:

isotopy

E:

No option

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34:

The substance often used for vulcanization of rubber is

A:

chlorine

B:

hydrogen peroxide

C:

sulphur

D:

tetraoxosulphate(VI) acid

E:

No option

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35:

A gas that is not associated with global warming is

A:

CO2

B:

SO3

C:

CH4

D:

H2

E:

No option

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36:

The refreshing and characteristic taste of soda water and other soft drinks is as a result of the presence in them of

A:

carbon(IV)oxide

B:

carbon(II)oxide

C:

soda

D:

glucose

E:

No option

View Solution

37:

A form of carbon used for absorbing posonous gases and purification of noble gases is?

A:

wood charcoal

B:

animal charcoal

C:

carbon fibres

D:

carbon black

E:

No option

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38:

Synthesis gas is a mixture of

A:

CH4 and H2O

B:

CH4 and H2

C:

CO2 and H2

D:

CO and H2

E:

No option

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39:

Potassium vapour burns with a

A:

blue flame

B:

brick-red flame

C:

violet flame

D:

golden-yellow flame

E:

No option

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40:

A common characteristics of copper and silver in their usage as coinage metals is that they

A:

have high metallic lustre

B:

are not easily oxidized

C:

are easily oxidized

D:

are not easily reduced

E:

No option

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41:

Haematite is an ore of

A:

zinc

B:

lead

C:

iron

D:

copper

E:

No option

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42:

The least easily oxidized of the metals below is

A:

Ca

B:

Na

C:

Zn

D:

Al

E:

No option

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43:

The repeating unit in natural rubber is

A:

alkyne

B:

isoprene

C:

n-propene

D:

neoprene

E:

B

View Solution

44:

Unsaturated organic compounds are identified by decolourization of

A:

silver bromine and potassium tetraoxomanganate (VII) solutions

B:

bromine water and acidified potassium tetraoxomanganate (VII) solution

C:

silver bromide solution and bromine water

D:

bromine water and alkaline potassium tetraoxomanganate (VII) solution

E:

No option

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45:

The conditions necessary for the extraction of a water molecule from two molecules of ethanol are

A:

less acid and a lower temperature

B:

excess acid and a lower temperature

C:

excess acid and a higher temperature

D:

less acid and a higher temperature

E:

No option

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46:

The chlorinated alkane often used industrially to remove grease is

A:

tetrachloromethane

B:

chloromethane

C:

trichloromethane

D:

dichloromethane

E:

No option

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47:

The reaction of carbide with water gives

A:

ethyne

B:

ethene

C:

ethane

D:

ethanal

E:

No option

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48:

                  O

                  ||

CH3 - CH2 - C - OCH2CH3

The compund above is an

A:

ether

B:

ester

C:

alkanal

D:

alkanol

E:

No option

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49:

Alkanoles are generally obtained by the oxidation of

A:

primary alkanols

B:

secondary alkanols

C:

tertiary alkanols

D:

alkanoic acid

E:

No option

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50:

Sucrose is made up of

A:

glucose and glucose

B:

glucose and fructose

C:

fructose and fructose

D:

galactose and glucose

E:

No option

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