JAMB Chemistry 2017 Past Questions

The general formula of alkanones is

The constituent common to duralumin and alnico is

The shape of the S-orbital is

Aluminium hydroxide is used in the dyeing industry as a

The tincture of iodine means iodine dissolved in

Temporary hard water is formed when rain water containing dissolved carbon(IV) oxide flows over deposits of

The acid anhydride that will produce weak acid in water is

The process that occurs when two equivalent forms of a compound are in equilibrium is

In the laboratory preparation of ethyl ethanoate, the water present in the mixture is removed using a solution of

The constituent of air necessary in the rusting process are

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

A given mass of gas occupies 2dm³ at 300k. At what temperature will its volume be doubled, keeping the pressure constant?

The oxidation number of iodine in KIO₃ is

An isomer of C₅H₁₂ is

When few drops of concentrated trioxonitrate(V) acid is added to an unknown sample and wanned an intense yellow colouration is observed. The likely functional group present in the sample is

A sample of orange juice is found to have a PH of 3.80. What is the concentration of the hydroxide ion in the juice?

The salt formed from a weak acid and a strong base hydrolyzes in water to form

The ideal gas laws and equations are true for all gases at

When ΔH is negative, a reaction is said to be

\(^{226}_{88}Ra\) → \(^x_{86}Rn\) + alpha particle

The shape of ammonia molecules is

The mass of silver deposited when a current of 10A is passed through a solution of silver salt for 4830s is – (Ag = 108 F = 96500(mol^-1)

Tin is unaffected by air at ordinary temperature due to its

Calculate the amount in moles of silver deposited when 9650C of electricty is passed through a solution of silver salt [= 96500 Cmol^-1]

The reaction of halogens in the presence of sunlight is an example of

The enzyme used in the hydrolysis of starch to dextrin and maltose is

The alkyl group is represented by the general formula

CH₂S_(g) + O_2(g) → 2Cn + SO_2(g)
What is the change in the oxidation number of copper in the reaction?

In the diagram above. X is

The diagram above. Y is

Calculate the mass of copper deposited when a current of 0.5 ampere was passed through a solution of copper(II) chloride for 45 minutes in an electrolytic cell. [Cu = 64, F = 96500Cmol^-1]

C₃H₅ - COH₃ =CH₂
The IUPAC nomenclature of the structure above is

The reddish–brown rust on ion roofing sheets consists of

The densities of two gases, X and Y are 0.5gdm^-3 and 2.0gdm^-3 respectively. What is the rate of diffusion of X relative to Y?

The carbon atoms on ethane are

According to Charle's law, the volume of a gas becomes zero at

An oxide XO₂ has a vapour density of 32. What is the atomic mass of X?

The gas that can be collected by downward displacement of air is

In the laboratory preparation of trioxonitrate (V) acid the nitrogen(iv) oxide formed as a by-product is removed by

A particle that contains a protons, 10 neutrons and 10 electrons is

Ethene is prepared industrially by

Calculate the amount in moles of a gas which occupies 10.5 dm³ at 6 atm and 30^oC [R = 082 atm dm³ K^-1 mol^-1]

If 100cm³ of oxygen pass through a porous plug is 50 seconds, the time taken for the same volume of hydrogen to pass through the same porous plug is? [O = 16, H = 1]

Due to the high reactivity of sodium, it is usually stored under

The furring of kettles is caused by the presence in water of

Water for town supply is chlorinate to make it free from

Ca(OH)_2(s) + 2NH₄Cl_(g) → CaCl_2(s) + 2H₂O_2(l) + X. In the reaction above X is

X_(g) + 3Y_(g) ---- 2z_(g) H = +ve. if the reaction above takes place at room temperature, the G will be