JAMB UTME - Chemistry - 1988

What are the possible oxidation numbers of an element if its atomic number is 17?

Awọn alaye Idahun

17 = 2, 8, 7

Which of the following is used in fire extinguishers?

Awọn alaye Idahun

In the experiment above, ammonium chloride crystals deposit on the walls of the tube is as a result of

Awọn alaye Idahun

Suitable reagents for the laboratory preparation nitrogen are?

Awọn alaye Idahun

A substance S is isomorphous with another substance R. When a tiny crystals of S is added into a supersaturated solution of R?

Awọn alaye Idahun

Which of the following compounds has the highest boiling point?

Awọn alaye Idahun

Which of the following statements is NOT correct?

Awọn alaye Idahun

Increasing the pressure confines the gas molecules to a smaller space, thereby reducing the volume. Reducing the pressure the other way round increases the volume of a gas.

The thermal decomposition of copper (ll)trioxonitrate (V) yields copper (ll) oxide, oxygen and?

Awọn alaye Idahun

The formula of a compound formed in a reaction between a trivalent metal M and a tetravalent non-metal X is~?

Awọn alaye Idahun

M2+ + X-4 = M4X3

In the experiment above, ammonium chloride crystals deposit on the walls of the tube is as a result of

Awọn alaye Idahun

An increase in temperature causes an increase in the pressure of a gas because there is an increase in the?

Awọn alaye Idahun

Aluminium is extracted commercially from its ore by?

Awọn alaye Idahun

The ion that may be assumed to have negligible concentration in a sample of water that lathers readily with soap is?

Awọn alaye Idahun

What process would coal undergo to give coal gas, coal tar, ammoniacal liquor and coke?

Awọn alaye Idahun

The molar ratio of oxygen to nitrogen in dissolved air is 2:1 whereas the ratio is 4:1 in atmospheric air because?

Awọn alaye Idahun

The IUPAC name for

Awọn alaye Idahun

Carbon (ll) oxide may be collected as shown above because it

Awọn alaye Idahun

Chlorine is produced commercially by?

Awọn alaye Idahun

The energy changes accompanying the addition of an electron to a gaseous atom is called?

Awọn alaye Idahun

Which of the following dilute solutions has the lowest pH value?

Awọn alaye Idahun

A metallic ion X2+ with an inert gas structure contains 18 electrons. How many protons are there in this ion?

Awọn alaye Idahun

Detergents have the general formula?

Awọn alaye Idahun

The forces holding naphthalene crystals together can be overcome when naphthalene is heated to a temperature of 354K resulting in the crystal to melting. These forces are known as?

Awọn alaye Idahun

An eruption pollution an environment with gas suspected to be H2S, a poisonous gas. A residue team should spray the environment with?

Awọn alaye Idahun

Which of the followingstatements is TRUE?

Awọn alaye Idahun

The acidic hydrogen in the compound is the hydrogen attached to carbon number

Awọn alaye Idahun

Which of the following reactions takes place in the cathode compartment during the electrolysis of copper (II) chloride solution?

Awọn alaye Idahun

Which of the following physical properties decreases across the Periodic Table?

Awọn alaye Idahun

2.25g of a sample of an oxide of copper on reduction gave 2.0g of copper. 2.50g of another oxide of copper on reduction also gave 2.0g of copper. These results are in accordance with the law of?

Awọn alaye Idahun

Crude copper can be purified by the electrolysis of CuSO4(aq) if?

Awọn alaye Idahun

Which of the following substances is a basic salt?

Awọn alaye Idahun

One mole of propane is mixed with five moles of oxygen. The mixture is ignited and the propane burns completely. What is the volume of the products at s.t.p?(G.M.V = 22.4 dm3 mol-1)

Awọn alaye Idahun

C3H8 + 5O2 → 3CO2 + 4H2O
When the mixture is ignited CO2 is collected as product. From the equation 33 moles of CO2 is produced which equals 3 x 2.4 dm3 = 67.2 dm3 at S.T.P

Alkanoates are formed by the reaction of alkanoic acid with?

Awọn alaye Idahun

What volume of a 0.1 M H3PO4 will be required to neutralize 45.0 cm3 of a 0.2 M NaOH?

Awọn alaye Idahun

Which of the following in aqueous solution is neutral to litmus?

Awọn alaye Idahun

The four classes of hydrocarbons are?

Awọn alaye Idahun

When H2S gas is passed into a solution of iron (III) chloride, the colour changes from yellow to green. This is because?

Awọn alaye Idahun

Use the graph above to answer this question. The mass of a substance, M, liberated at an electrode during electrolysis is proportional to the quantity of electricity, Q passing through the electrolyte. This is represented graphically by.

Awọn alaye Idahun

Methylethanoate reacts with ammonia to yield?

Awọn alaye Idahun

The diagram above shows the reaction path of an exothermic reaction. The heat of reaction is represented by

Awọn alaye Idahun

A mixture of starch solution and potassium iodide was placed in a test tube. On adding dilute tetraoxosulphate (lV) acid and then K2Cr2O7 solutions, a blue-black colour was produced. In this reaction, the?

Awọn alaye Idahun

Which of the following will produce the greatest increase in the rate of the chemical reaction represented by the equation Na2S2O3(aq) + 2HCl(aq) → 2NaCI(aq) + H2O(I) + SO2(g) + S(g)?

Awọn alaye Idahun

Given the reactions (i) Fe(s) + X(NO3)2(aq) → Fe(NO3) + X(s) (ii) H2(g) + XO → X + H2O(s); X is likely to be?

Awọn alaye Idahun

Which property of a reversible reaction is affected by a catalyst?

Awọn alaye Idahun

Which of the following acts as both a reducing and an oxidizing agent?

Awọn alaye Idahun