JAMB UTME - Chemistry - 2008

Use the diagram to answer this question.

The colour of the fountain water is

Bayanin Amsa

The atom of an element X is represented as ${}_z^{y}X$. The basic chemical properties of X depend on the value of

Bayanin Amsa

The vulcanizer's solution is prepared by dissolving rubber in

Bayanin Amsa

Reduction of alkanonoes with LialH4 produces

Bayanin Amsa

Detergents are manufactured with straight hydrocarbon chains so as to make them

Bayanin Amsa

The product obtained when a mixture of benzene vapour and hydrogen are passed over nickel catalyst at 180oC is

Bayanin Amsa

The experiment that showed that atoms have tiny positively charged nucleus was first carried out by

Bayanin Amsa

The IUPAC nomenclature for the structure above is

Bayanin Amsa

In countries where the temperature falls below 273K, salt is always sprinkled on the icy road in order to

Bayanin Amsa

300 cm3 of gas has a pressure of 800 mmHg. If the pressure is reduced to 650 mmHg, find its volume

Bayanin Amsa

P1V1= P2V2
800 * 300 = 650 * V2
V2 = (800 * 300)/650 = 369.23 cm3

When a few drops of water is added to a blue anhydrous cobalt (II) chloride, the colour changes to

Bayanin Amsa

Reduction of nitroalkanes, nitrites and amides is a route for the preparation of

Bayanin Amsa

What is the IUPAC nomenclature of the compound NaCIO?

Bayanin Amsa

When a solution of ammonium trioxocarbonate (IV) is added to a solution of an unknown salt, a white precipitate which is soluble in dilute hydrochloric acid but insoluble in ethanoic acid is formed. This indicates the presence of

Bayanin Amsa

If the silver mirror test is positive, it indicates the presence of an

Bayanin Amsa

The substance that is used in the steel industry for the removal of carbon, sulphur and phosphorus impurities from pig iron is

Bayanin Amsa

In the periodic table, the electrical and thermal conductivities are properties of elements that

Bayanin Amsa

The uncovered raw food that is sold along major roads is likely to contain some amounts of

Bayanin Amsa

The rate of a reaction usually decrease in the concentration of reactants because

Bayanin Amsa

The diagram above represent the electron sub-level for

Bayanin Amsa

A catalyst speeds up the rate of chemical reaction by

Bayanin Amsa

Insoluble salts can be prepared by

Bayanin Amsa

Two soluble metal salts react with each other to form one soluble salt and one insoluble salt . Lead nitrate solution and sodium chloride solution react to produce solid lead chloride , leaving soluble sodium nitrate in solution. The lead chloride can be recovered by filtration.

The most common ores of iron include

Bayanin Amsa

The basicity of CH3COOH is

Bayanin Amsa

Diffusion is slowest in solid particles than in particles of liquid and gases because

Bayanin Amsa

Leads is used for making bullets and lead shots because of its

Bayanin Amsa

NH3(g) + HCl(s) → NH4Cl(s)

The entropy change in the system above is

Bayanin Amsa

0.05 mol dm-3 HCl is neutralized by 25 cm3 NaOH. If the volume of acid used is 32.00cm3, what is the concentration of the base

Bayanin Amsa

HCl + NaOH → NaCl + H2O
CAVA = NA/NB = (0.05 * 32)/(CB * 25)
∴ CB = (0.05 * 32)/25 = 0.064 mol dm-3

117.0g of sodium chloride was dissolved in the solubility in 1.0dm3 of distilled water at 25oC. Determine the solubility in mol dm-3 of sodium chloride at that temperature

[Na = 23, Cl = 35.5]

Bayanin Amsa

Relative molecular mass of NaCl = 23 + 35.5 = 55.5 g/mol
No. of mole of NaCl = 117/55.5 = 2.1 mol

Bayanin Amsa

If glucose is heated with concentration tetraoxosulphate (VI) acid, it will be dehydrated to

Bayanin Amsa

If a given quantity of electricity liberates 0.65g of Zn2+, what amount of Hg2+ would be liberated by the same quantity of current?

[Zn = 65, Hg = 201]

Bayanin Amsa

Which of the following compounds of trioxonitrate (V) will decomposes to give dinitrogen (i) oxide and water when heated?

Bayanin Amsa

${}_{11}^{11}Na{+}_0^{1}n{\to }_{11}^{24}Na$

The reaction above is an example of

Bayanin Amsa

Polyvinyl chloride is used in the production of

Bayanin Amsa

Bayanin Amsa

A hydrocarbon X with a molar mass of 26 consists of 92.3% carbon. What is its molecular formular

Bayanin Amsa

% of H2 = 100 - 92.3 = 7.7%
mole = 92.3/12 7.7/1
7.1/7.1 7.1/7.1
empirical formula = CH
(CH)n = 26
(12 + 1)n = 26
(13)n = 26
n = 26/13 = 2
molecular formula = C2H2

16.8 g of sodium hydrogen trioxocarbonate (IV) is completely decomposed by heat. Calculate the volume of carbon(IV) oxide given off s.t.p

[Na 23, C = 12, O = 16, H = 1, Molar volume of a gas at s.t.p = 22.4 dm3]

Bayanin Amsa

2NaHCO3(s) → Na2CO3(s) + H2O(l) + CO2
Relative molecular mass of NaHCO3 = 23 +1 + 12 + 16 * 3 = 84smol-1
2 * 84g of NaHCO3 will be liberated 22.4dm3 or CO2 at s.t.p
16.8g of NaHCO3 will libertae (16.8 * 22.4)/(2 * 84) = 2.24 dm3

Chlorophyll obtained from given leaves of plant can be shown to be composed of more than one coloured component by the technique of

Bayanin Amsa

Bayanin Amsa

The correct answer is 11.
pH = -log(H+) Or 14 - pOH
pOH = -log(0.001)
pOH = 3
pH = 14 - 3 = 11

In the course of purifying water for town supply the water is passed through large settlings tanks, containing sodium aluminate (III) to remove

Bayanin Amsa

Use the diagram to answer this question.

The gas that can be used to demonstrate the experiment is

Bayanin Amsa

Air boiled out of water as steam is richer in

Bayanin Amsa

2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)

From the equation above, calculate the mass of sodium hydroxide produced by 2.3g of sodium.

[H = 1, O = 16, Na = 23]

Bayanin Amsa

2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
Relative molecular mass of NaOH = 23 + 16 + 1 = 40smol-1
2 * 23g of sodium react with water to produce
2 * 40g of NaOH
∴ 2.3g of sodium will react with water to produce
(2.3 * 40 * 2)/(23 * 2) = 4.00g

The oxidation state of carbon in HCOOH is

Bayanin Amsa

HCOOH
O.N of H + O.N of C + 2* O.N of oxygen of
H = 0
1 + X + 2X - 2 + 1 = 0
2 + X -4 = 0
X = 4 - 2 = +2

In recharging a lead-acid accumulator, the reaction at the cathode can be represented as

Bayanin Amsa

Which of the following reaction is endothermic?

Bayanin Amsa

The type of isomerism shown by cis- and trans- isomers is

Bayanin Amsa

Choose the correct option from the structure above

Bayanin Amsa