JAMB UTME - Chemistry - 1988

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

Alkanoates are formed by the reaction of alkanoic acid with?

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

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?

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

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

Which of the following substances is a basic salt?

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

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?

Aluminium is extracted commercially from its ore by?

Which of the following statements is NOT correct?

Which of the following compounds has the highest boiling point?

Chlorine is produced commercially by?

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

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

Which of the followingstatements is TRUE?

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

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

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

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.

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?

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

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

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

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

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

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

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

Which of the following is used in fire extinguishers?

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

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

The IUPAC name for

The four classes of hydrocarbons are?

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

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?

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

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)?

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

Detergents have the general formula?

Methylethanoate reacts with ammonia to yield?

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

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)

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

Suitable reagents for the laboratory preparation nitrogen are?

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