JAMB UTME - Chemistry - 1986

Tazama Jibu

Swali 10 Ripoti

The exhaust fumes from a garage in a place that uses petrol of high sulphur content are bound to contain?

CO and SO3

CO and SO2

CO,SO2 and SO3

CO and H2S

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Tazama Jibu

Swali 11 Ripoti

Which of the following compounds is NOT formed by the action of chlorine on methane?

CH3CI

C2H5CI

CH2CI2

CHCI3

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

Tazama Jibu

Swali 12 Ripoti

Use the options above to answer this question. Which is the structural formula for pent-2-enoic acid?

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

Tazama Jibu

Swali 13 Ripoti

The movement of liquid molecules from the surface of the liquid to the gaseous phase above it is known as?

Brownian movement

condensation

evaporation

liquefaction

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Tazama Jibu

Swali 14 Ripoti

The relationship between the velocity (U) of gas molecules and their relative molecular mass (M) is shown by the equation

U = (kM)

\frac{1}{2}

U = (kM)2

U =

\sqrt{k} m

U = (

\frac{k}{m}

)

^{\frac{1}{2}}

Maelezo ya Majibu

The relationship between (U) of a gas molecule and the relative molecular mass is $\bar{U}$ = ( $\frac{k}{m}$ ) $^{\frac{1}{2}}$

or $\bar{U}$ = $\sqrt{k} m$

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Tazama Jibu

Swali 15 Ripoti

When ethanol is heated with excess concentrated sulphuric acid, the ethanol is?

oxidized to ethene

polymerized to polyethene

dehydrated to ethene

dehydrated to ethyne

Maelezo ya Majibu

Tazama Jibu

Swali 16 Ripoti

Which of the following compounds would give lilac flame coloration and a white precipitate with acidified barium chloride solution?

KCI

NaNO3

K2SO4

CaSO4

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Tazama Jibu

Swali 17 Ripoti

What mass of a divalent metal M (atomic mass = 40) would react with excess hydrogen gas measured at S.T.P?

8.0 g

4.0 g

0.8 g

0.4 g

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Tazama Jibu

Swali 18 Ripoti

10cm3 of hydrogen fluoride gas react with 5cm3 of dinitrogen difluoride gas (N2F2) to form 103 of a single gas. Which of the following is the most likely equation of the reaction?

HF + N2F2

\to

N2HF3

2HF + N2F2

\to

2NHF2

2HF + N2F2

\to

N2H2F3

HF + 2N2F2

\to

N4HF2

Maelezo ya Majibu

Soma maelezo ya somo kwenye Stoichiometry And Chemical Reactions (WAEC)

Tazama Jibu

Swali 19 Ripoti

The reaction Mg + H2O → MgO + H2 takes place only in the presence of?

excess Mg ribbon

excess cold water

very hot water

steam

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemical Combination (JAMB)

Chemical Combination

Tazama Jibu

Swali 20 Ripoti

What is the consequences of increasing pressure on the equilibrium reaction ZnO(s) + H2(g) Zn(s) + H2O(I)?

The equilibrium is driven to the left

The equilibrium is driven to the right

There is no effect

More ZnO is produced

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemical Kinetics And Equilibrium Systems (Ghana Only) (WAEC)

Chemical Kinetics And Equilibrium Systems (Ghana Only)

Tazama Jibu

Swali 21 Ripoti

How many coulombs of electricity are passed through a solution in which 6.5 amperes are allowed to run for 1.0 hour?

3.90 x 102 coulombs

5.50 x 103 coulombs

6.54 x 103 coulombs

2.34 x 104 coulombs

Maelezo ya Majibu

Soma maelezo ya somo kwenye Electrolysis (JAMB)

Electrolysis

Tazama Jibu

Swali 22 Ripoti

Which of the following is an acidic salt?

NaHSO4

Na2SO4

CH3CO2Na

Na2S

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (Ghana Only) (WAEC)

Soma maelezo ya somo kwenye Periodic Chemistry (Ghana Only) (WAEC)

Acids, Bases And Salts (Ghana Only)

Tazama Jibu

Swali 23 Ripoti

A white solid suspected to be lead trioxonitrate (V) zinc trioxocarbonate (IV) or calcium trioxocabonate (IV) was heated strongly. Its residue which was yellow when hot and white when cold is?

lead (II) oxide

calcium oxide

zinc oxide

lead nitrate

Maelezo ya Majibu

Soma maelezo ya somo kwenye Periodic Chemistry (Ghana Only) (WAEC)

Tazama Jibu

Swali 24 Ripoti

How much of magnesium is required to react with 260cm3 of 0.5 M HCl? [Mg = 24]

0.3g

1.5g

2.4g

3.0g

Maelezo ya Majibu

Soma maelezo ya somo kwenye Stoichiometry And Chemical Reactions (WAEC)

Tazama Jibu

Swali 25 Ripoti

In the course of an experiment, two gases X and Y were produced. X turned wet lead ethanoate to black and Y bleached moist litmus paper. What are the element(s) in each of the gases X and Y respectively?

H and S;Cl

H and O;Cl

H and S;C and O

H and Cl;S and O

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemical Combination (JAMB)

Chemical Combination

Tazama Jibu

Swali 26 Ripoti

Starch can be converted to ethyl alcohol by?

distillation

fermentation

isomerization

cracking

Maelezo ya Majibu

Soma maelezo ya somo kwenye Electrolysis (JAMB)

Electrolysis

Tazama Jibu

Swali 27 Ripoti

Which of the following does NOT contain aluminium as component?

Over-head cables

Duralumin

Container for caustic soda

Container for nitric acid

Maelezo ya Majibu

Soma maelezo ya somo kwenye Metals And Their Compounds (JAMB)

Metals And Their Compounds

Tazama Jibu

Swali 28 Ripoti

When chlorine is passed into water and subsequently exposed to sunlight, the gas evolved is?

HCl

HOCl

Cl2O

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Tazama Jibu

Swali 29 Ripoti

Which of these represents a redox reaction?

AgNO3 + NaCl → AgCAl + NaNO3

H2S + Pb(NO3) → PbS + 2HNO3

CaCO3 → CaO + CO2

Zn + 2HCl → ZnCl2 + H2

Maelezo ya Majibu

Soma maelezo ya somo kwenye Redox Reactions (WAEC)

Redox Reactions

Tazama Jibu

Swali 30 Ripoti

When 50cm3 of a saturated solution of sugar (molar mass 342.0g) at 40oC was evaporated to dryness, 34.2g of dry solid was obtained. The solubility of sugar at 40oC is

10.0 moles dm-3

7.0 moles dm-3

3.5 moles dm-3

2.0 moles dm-3

Maelezo ya Majibu

Soma maelezo ya somo kwenye Solubility (JAMB)

Soma maelezo ya somo kwenye Solubility Of Substances (Ghana Only) (WAEC)

Solubility

Solubility Of Substances (Ghana Only)

Tazama Jibu

Swali 31 Ripoti

Which of the following solutions will conduct the least amount of electricity?

2.00 M aqueous solution of NaOH

0.01 M aqueous solution of NaOH

0.01 M aqueous solution of hexanoic acid

0.01 M aqueous solution of sugar

Maelezo ya Majibu

Soma maelezo ya somo kwenye Non-metals And Their Compounds (JAMB)

Non-metals And Their Compounds

Tazama Jibu

Swali 32 Ripoti

The tabulated results below were obtained by titration 10.0 cm3 of water with soup. The titration was repeated with the same sample of water after boiling. The ratio of permanent to temporary hardness is

1.5

1.4

4.1

5.1

Maelezo ya Majibu

The ratio of permanent to temporary hardness will be 20:(20 - 15)

= 20:5

= 4:1

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Tazama Jibu

Swali 33 Ripoti

What reaction takes place when palm-oil is added to potash and foam are observed?

Neutralization

Saponification

Esterification

Salting-out

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Tazama Jibu

Swali 34 Ripoti

20 cm3 of 1.0 molar NH4OH solution when neutralized with 20.05cm3 of 0.1 molar HCl liberated -102 joules of heat. Calculate the heat of neutralization of NH4OH?

-51.O KJ mol-

+57.3 KJ mol-

+57.O KJ mol-

+51.0 KJ mol-

Maelezo ya Majibu

NH4OH = 20cm of 0.1 m
NH4 + HCl → NH4Cl = H2O
Heat of Neutralization of NH4OH
= $\frac{- 102}{2}$ = -51.0 KJ mole-1

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Tazama Jibu

Swali 35 Ripoti

What are the values of x, y and z respectively in the equation: xCu + yHNO3 ? xCu(NO3)2 + 4H2O + zNO?

4: 1: 2

3:8:2

2:8:3

8:3:2

Maelezo ya Majibu

Soma maelezo ya somo kwenye Stoichiometry And Chemical Reactions (WAEC)

Tazama Jibu

Swali 36 Ripoti

In the electrolysis of aqueous solution of K2SO 4 in the above cell, which species migrate to the anode?

SO2-OH -

K + and SO 42-

OH and HO

H3O + and K

Maelezo ya Majibu

Soma maelezo ya somo kwenye Electrolysis (JAMB)

Electrolysis

Tazama Jibu

Swali 37 Ripoti

The general formula of an alkyl halide (where X represents the halide) is?

CnH2n2X

CnH2n + 1X

CnH2n + 2X

CnH2nX

Maelezo ya Majibu

Soma maelezo ya somo kwenye Periodic Chemistry (Ghana Only) (WAEC)

Soma maelezo ya somo kwenye Chemical Equilibra (JAMB)

Chemical Equilibra

Tazama Jibu

Swali 38 Ripoti

The number of atoms of chlorine present in 5.85g of NaCl is [Avogaro's Number = 6.02 x 1023]

6.02 x 1022

5.85 x 1023

6.02 x 1023

5.85 x 1024

Maelezo ya Majibu

The number of atoms of chloride present in 5.85g of NaCl is 5.85 x 6.0 x 1023

= 6.02 x 1022

Soma maelezo ya somo kwenye Stoichiometry And Chemical Reactions (WAEC)