2019 JAMB Chemistry Past Questions

A secondary alkanol can ne oxidized to give an

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

The IUPAC name for CH₃CH₂COOCH₂CH₃ is

A certain hydrocarbon on complete combustion at s.t.p. produced 89.6dm³ of CO₂ and 54g of water. The hydrocarbon should be

2 – methyl prop – l – ene is an isomer of

Hydrocarbons which react with Tollen’s reagent conform to the general formula.

The IUPAC name of the compound CF₃CHBrCl is

Synthetic rubber is obtained from the polymerization of

Burning magnesium ribbon in air removes which of the following?

I. oxygen
II. nitrogen
III. argon
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?

SO₃ is not directly dissolved in water in the industrial preparation of H₂SO₄ by the contact process because

Which of the following statements does not show Rutherford’s account of nuclear theory? An atoms contains a region which

Consider the reaction:

\(\scriptsize A_{\left ( s \right )}+2B_{\left ( g \right )}\rightarrow 2C_{\left ( aq \right )}+D_{\left ( g \right )}\)

What will be the effect of a decrease in pressure on the reaction?

If acidified Potassium Dichromate (VI) {K₂Cr₂O₇} acts as oxidizing agent, colour changes from

At 37°C, 58.5 g of sodium chlorine is present in a 250 cm³ of a solution. The solubility of sodium chloride at this temperature is?

[molar mass of sodium chloride = 111.0 gmol^-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

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?

Consider the equation below:

\(\scriptsize Cr_{2}O^{2-}_{7}\: + \: 6F^{2+}_{e} \: + \: 14H^+\rightarrow 2C^{+3}_{r} \:+\: 6Fe^{3+}\: +\: 7H_{2}O\)

The oxidation number of chromium changes from

In the reaction between sodium hydroxide and tetraoxosulphate (VI) solutions, what volume of 0.5 molar sodium hydroxide would exactly neutralize 10 cm³ of 1.25 molar tetraoxosulphate (VI) acid?

What mass of magnesium would be obtained by passing a current of 2A for 2 hours 30mins through molten magnesium chloride? {1 Fard = 96, 500C, Mg = 24}

The electronic configuration of element Z is 1S²2S²2P⁶3S²3P¹. What is the formula of the compound formed between Z and tetraoxosulphate (VI) ion?

The following are isoelectronic ions except

Consider the reaction:

\(\scriptsize A+2B_{\left ( g \right )}\rightleftharpoons 2C+D_{\left ( g \right )}\:\:\;(\Delta H = +ve) \)

What will be the effect of decrease in temperature on the reaction?

Which quantum divides shells into orbits?

The oxidation state(s) of nitrogen in ammonium nitrate is/are

Hydrogen bond is a sort of

Methane is prepared in the laboratory by mixing sodium ethanoate with soda lime. The chemical constituent(s) of soda lime is/are

Which of the following sets of operation will completely separate a mixture of sodium chloride and Iodine?

X is a substance which liberates CO₂ on treatment with concentrated H₂SO₄. A warm solution of X can decolourize acidified KMO₄. X is

The emission of two successive particles of beta from the nucleus \(\scriptsize ^{32} _{15} P\) will produce

How many alkoxyalkanes can be obtained from the molecular formula C₄H₁₀O?

200 cm³ of 0.50 mol/dm³ solution of calcium hydrogen tetraoxocarbonate (IV) is heated. The maximum weight of solid precipitated is

Which of the following conditions will most enhance the spontaneity of a reaction?

Hydrogen diffuses through a porous plug