JAMB Chemistry 2013 Past Questions

The presence of an impurity in substance will cause the melting point to

What volume of carbon (ll) oxide is produced by reacting excess carbon with 10 dm³ of oxygen?

The rate of diffusion of a gas Y is twice that of Z If the relative molecular mass of Y is 64 and the two gases diffuse under the same conditions, find the relative molecular mass of Z

The radioisotope used in industrial radiography for the rapid checking of faults in welds and casting is

The shape of the carbon (lV) oxide molecule is

Which of the following molecules is held together by hydrogen bond?

The bond formed between two elements with electron configurations 1s² 2s² 2p⁶ 3s² and 1s² 2s² 2p⁴ is

The constituent of air that acts as a diluent is

Steam changes the colour of anhydrous cobalt (ll) chloride from

An example of a hygroscopic substance is

If 24.4 g of lead (ll) trioxonitrate (V) were dissolved in 42 g of distilled water at 20^oC; calculate the solubility of the solute in gdm^-3.

The solvent used for removing grease stain is

In a water body, too much sewage leads to

10.0 dm³ of water was added to 2.0 mol dm^-3 of 2.5dm³ solution of HCl. What is the concentration of the final solution in mol dm^-3?

Three drops of a 1.0 mol dm^-3 solution of HCl was added to 20 cm³ of a solution of pH6.4. The pH of the resulting solution will be

Which of the following substances is not a salt?

An insoluble salt can be prepared by

2H₂O _(l) + 2F_2(g) → 4HF_(aq) + O_2(g).
In the reaction above, the substance that is being reduced is

In an electrochemical cell, polarization is caused by

Calculate the volume in cm³ of oxygen evolved as s.t.p. when a current of 5 A is passed through acidified water for 193s
{F = 96500 Cmol^-1, Molar volume of a gas at s.t.p. = 22.4 dm³}

In an endothermic reaction, if there is a loss in entropy the reaction will

the minimum amount of energy required for a reaction to take place is

Which of the following compounds is a neutral oxide?

In the laboratory preparation of ammonia, the flask is placed in a slanting position so as to

Which of the gases is employed as an anaesthesia?

Sulphur (IV)oxide is a strong reducing agent in the presence of water due to the formation of

A metal that forms soluble trioxosulphate (IV) ion is

Copper is displaced from the solution of its salts by most metals because it

The coloured nature of transition metal ions are associated with their partially filled

Aluminium containers are frequently used to transport trioxonitrate (V) acid because aluminium

2- methylbutan- 2ol is an example of a

The reaction between ammonia and ethyl ethanoate produces

The decarboxylation of ethanoic acid will produce carbon (IV)oxide and

A primary amide is generally represented by the formula

Which of the following fraction is used as raw material for the cracking process?

An organic compound contains 60% carbon, 13.3% hydrogen and 26.7% oxygen. Calculate the empirical formula
rn(C=12,H =1, O=16)

From the diagram above, an ideal gas is represented by

In the graph above, the activation energy of the catalyzed reaction is

Choose the correct option from the graph above . 3Fe_(S) + 4H₂O_(g) ⇌ Fe₃O_4(s) + 4H_2(g). The equilibrium constant, K, of the reaction above is represented as

The IUPAC nomenclature for the compound above is

Use the above option to answer this question. The dehydration of ammonium salt of alkanoic acids produces a compound with the general formula

Use the following option above to answer this question. Which of the following compounds in solution will turn red litmus paper blue?

The compound above is an

How many unpaired electron are in the p-orbitals of a fluorine atom?

The radioactive emission with the least ionization power is

Zn_(s) + CuSO_4(aq) \( \to \) ZnSO_4(aq) + Cu_(s)

In the reaction above, the oxidizing agent is

2SO_2(g) + O_2(g) \( \iff \)2SO_3(g)

\( \bigtriangleup H = -395.7kJmol^{-1} \)

In the reaction above, the concentration of 2SO_3(g) can be in creased by