JAMB Chemistry 2019 Past Questions

A second alkanol can be oxidized to give an

Which of the following will give a precipitate with an aqueous solution of copper (I) chloride?

The IUPAC name for CH\(_3\)CH\(_2\)COOCH\(_2\)CH\(_3\) is

A certain hydrocarbon on complete combustion at s.t.p produced 89.6dm\(^3\) of CO\(_2\) and 54g of water. The hydrocarbon should be

2-methylprop-1-ene is an isomer of

Hydrocarbons which will react with Tollen's reagent conform to the general formula

The IUPAC name of the compound CF\(_3\)CHBrCl is

A synthetic rubber is obtained from the polymerization of

Burning magnesium ribbon in air removes which of the following
(i) oxygen (ii) nitrogen (iii) argon and (iv) carbon(iv)oxide?

Which of the following is the best starting material for the preparation of oxygen? Heating of trioxonitrate (v) with

Which of the following metals is the most essential in the regulation of blood volume, blood pressure and osmotic equilibrium?

Which of the following alkaline metals react more quickly spontaneously with water?

When chlorine water is exposed to bright sunlight, the following products are formed

Which process(es) is/are involved in the turning of starch iodide paper blue-black by chlorine gas?

Which of the following is a set of neutral oxides?

SO\(_3\) is not directly dissolved in water in the industrial preparation of H\(_2\)SO\(_4\) by the contact process because

Which of the following statements does not show Rutherford's account of Nuclear Theory? An atom contains a region

Elements X and Y have electronic configurations 1s\(^2\)2s\(^2\)2p\(^4\) and 1s\(^2\)2s\(^2\)2p\(^6\)3s\(^2\)3p\(^1\) respectively. When they combine, the formula of the compound formed is

By what amount must the temperature of 200cm\(^3\) of Nitrogen at 27°C be increased to double the pressure if the final volume is 150cm\(^3\) (Assume ideality)

The combustion of carbon(ii)oxide in oxygen can be represented by equation.
2CO + O\(_2\) → 2CO\(_2\)
Calculate the volume of the resulting mixture at the end of the reaction if 50cm\(_3\) of carbon(ii)oxide was exploded in 100cm\(_3\) of oxygen

When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called

Which of the following represents the kind of bonding present in ammonium chloride?

Consider the reaction
A\(_{(s)}\) + 2B\(_{(g)}\) → 2C\(_{(aq)}\) + D\(_{(g)}\)
What will be the effect of a decrease in pressure on the reaction?

For the general equation of the nature
xP + yQ ⇌ mR + nS, the expression for the equilibrium constant is

Which of the following reactions is an oxidation process?

If acidified Potassium Dichromate(VI) (K\(_2\)Cr\(_2\)O\(_7\)) acts as oxidizing agent, color changes from

The heat of formation of ethene, C\(_2\)H\(_4\) is 50 kJmol\(^{-1}\), and that of ethane, C\(_2\)H\(_6\) is -82kJmol\(^{-1}\). Calculate the heat evolved in the process:

C\(_2\)H\(_4\) + H\(_2\) \(\to\) C\(_2\)H\(_6\)

Which of the following statements about catalyst is false?

Which of the following does not support the fact that air is a mixture?

What technique is suitable for separating a binary solution of potassium chloride and potassium trioxochlorate (V)?

At 27°C, 58.5g of sodium chloride is present in 250cm\(^3\) of a solution. The solubility of sodium chloride at this temperature is?
(molar mass of sodium chloride = 111.0gmol\(^{-1}\))

Which of the following properties increases from left to right along the period but decreases down the group in the Periodic Table?
i. Atomic Number   ii. Ionization energy  iii. Metallic character  iv. Electron affinity

The molecular shape and bond angle of water are respectively

Na\(_2\)CO\(_3\) + 2HCl \(\to\) 2NaCl + H\(_2\)O + CO\(_2\)

The indicator most suitable for this reaction should have a pH equal to

A radioactive nucleus has a half-life of 20 years, starting with 100,000 particles, how many particles will be left exactly at the end of 40 years

Which two gases can be used for the demonstration of the fountain experiment?

Which of the following pollutants will lead to the depletion of ozone layer?

Which of the following describes the chemical property of acids?

Which of the following pairs cannot be represented with a chemical formula?

Consider the equation below:

Cr\(_2\)O\(_7 ^{2-}\) + 6Fe\(^{2+}\) + 14H\(^{+}\) \(\to\) 2Cr\(^{3+}\) + 6Fe\(^{3+}\) + 7H\(_2\)O.

The oxidation number of chromium changes from

Which of the following is a physical change?

In the reaction between sodium hydroxide and tetraoxosulphate (VI) solutions, what volume of 0.5 molar sodium hydroxide would exactly neutralize 10cm\(^3\) of 1.25 molar tetraoxosulphate (vi) acid?

Sulphur exists in six forms in the solid state. This property is known as

In the reaction:
M + N → P
ΔH = +Q kJ

Which of the following would increase the concentration of the product?

A compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen. If the molar mass of the compound is 180. Find the molecular formula.
[H = 1, C = 12, O = 16]

The IUPAC nomenclature of the compound
H\(_3\)C - CH(CH\(_3\)) - CH(CH\(_3\)) - CH\(_2\) - CH\(_3\)

Which of the following gases contains the least number of atoms at s.t.p?

What mass of magnesium would be obtained by passing a current of 2 amperes for 2 hours 30 mins, through molten magnesium chloride?
[1 faraday = 96500C, Mg = 24]

Which important nitrogen-containing compound is produced in Haber's process?

Elements in the periodic table are arranged in the order of their