2017 JAMB Chemistry Past Questions CBT

An organic compound commonly used as disinfectant is

Which of the following is the least soluble in water?

The factor that lowers the activation energy of a chemical reaction is

Tin is unaffected by air at ordinary temperature due to its

Incomplete oxidation of ethanol yields

The oxidation number of iodine in KIO₃ is

The acidic anhydride that will produce weak acid in water is

If Y = 1s²s²p⁴ and X = 1s²s²p⁶s², the chemical formula for the likely compound formed between X and Y is

The constituent of air necessary in the rusting process is

The pollutant that may induce the condensation of water vapour in the atmosphere is

10 cm³ of hydrogen was sparked with 10 cm³ of oxygen at s.t.p. Calculate the volume of the unreacted gas.

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

2.5 g of potassium trioxonitrate(IV) saturates 20 g of water at 20º C. Calculate the solubility in gramme per 100 g

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 = 96500 C mol^-1]

Ca(OH)_2(s) +  2NH₄Cl_(g) → CaCl_2(s) + 2H₂O_(l)  +  X

In the above reaction, X is

Temporary hard water is formed when rainwater containing dissolved carbon(IV) oxide flows over a deposit of

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

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

Calculate the amount of moles of a gas which occupies 10.5 dm³ at 6 atm and 30ºC.

[R = 0.082 atm dm^-3 K^-1 mol^-1]

\( \scriptsize _9^{19}F \: + \: X \: \to  \: _{11}^{22}Na \: + \: _0^1 n \)

In the equation above, X is

In the diagram above, Y is

In the diagram above X is

Mild oxidation of propan -1- ol will yield

Ethene is prepared industrially by

Butter is an example of emulsion in which

In the laboratory preparation of trioxonitrate(V) acid, the nitrogen(IV) oxide formed as a by-product by

Sodium hydroxide can be used

The constituent common to duralumin and alnico is

A mixture of sugar and sulphur can best be separated by dissolution in water followed by

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

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

The IUPAC nomenclature of the structure above is

Calculate the amount of moles of silver deposited when 9650 C of electricity is passed through a solution of silver salt. [F = 96 500 C]

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

In which of the following reactions will an increase in pressure shift the equilibrium position to the left?

The product of the decay of phosphorus -32 as a β -emitter is

In the laboratory preparation of ethyl ethanoate, the water present in the mixture is removed by

The reaction of halogens with alkanes in the presence of sunlight is known as

\(\scriptsize X_{(g)} \: + \: 3Y_{(g)} \leftrightharpoons 2Z_{(g)} \; \Delta H = +ve \)

If the reaction above takes place at room temperature, the ΔG will be

The ability of an atom in a molecule to attract shared electrons to itself is