JAMB Chemistry 2007 Past Questions

Trioxonitrate (V) acid is not used for preparing hydrogen gas from metals because it

An element used in the production of matches is

When calcium oxide is heated with carbon, the oxide will

A solution which on treatment with hydrochloric acid produces a colourless, odourless gas which turns lime water milky is most likely to be a

The soft solder used for welding and plumbing is alloy of

The reddish-brown rust on iron roofing sheets consists of

Na₂S₂O_3(aq) + 2HCl_(aq) → 2NaCl_(aq) + H₂O_(l)
Which of the following would introduce the greatest increase in the rate of the chemical reaction above?

The tincture of iodine means iodine dissolved in

Cu²⁺_(aq) + 4NH_3(g) ↔ [Cu(NH₃)₄]²⁺_(aq)
In the reaction above, what is the effect of precipitating Cu²⁺_(aq) as CuS_(s)?

Copper and silver metals are commonly use as coin because they are

Which of the following sets of metals dissolves in dilute HCl?

If chlorine is bubbled into water and the resulting yellowish-green solution is exposed to bright sunlight for a while, the solution will decompose giving out

H₃PO_4(aq) + H₂O_(l) ↔ H₂PO₄^-_(aq) + H₃O⁺_(aq)
ΔH = -13kJ at 298K
In the reaction above, an increase in temperature would

The reaction that takes place in Daniell cell is

What happens when zinc rod is immersed in copper (II) tetraoxosulphate (VI) solution/

C₂H_4(g) + H_2(g) → C₂H_6(g) ΔH = -137kJ mol_-1
The reaction represented above is

How long would it take to deposit 0.08g of copper from CuCl₂ solution by passing a current of 0.5A?
[Cu = 64, F = 96500 C mol_-1]

tartaric acid is used industrially to

The salt formed from strong acid and a strong base is

Dissolving some pellets of NaOH in water would result in

Calculate the number of moles of HCl present in 20cm³ of a 0.75M solution of the acid

The oxidation state of oxygen in tetraoxosulphate (VI) acid is

MnO_2(s) + xHCl_(aq) → MnCl_2(aq) + yH₂O_(l) + zCl_2(g)
In theequation above, what are the values of x, y and z respectively

Calculate the mass of chlorine gas which occupies a volume of 1.12dm³ at s.t.p
[Cl = 35.5, molar volume of gas at s.t.p = 22.4 dm³

Which experiment led to the measurement of the charge on an electron?

What is the volume of oxygen required to burn complete 45 cm³ of methane at s.t.p?

How many electrons are in the L shell of ³¹₁₅P?

If the electron configuration of a element is p1s² 2s² 2P⁵, how many unpaired electron are there?

Which of the following decrease when a given mass of gas is compressed to half its initial volume?

the elements that belong to the third period of the periodic table are

A metal X forms two bromides with the formulae XBr₂ and XBr₃. What type of bonding exists between X and bromine in the bromide?

A mixture of petrol and water can be separated through

Which of the following represents an aromatic compound?

CH₃CH₂Cl + KCN → CH₃CH₂CN + KCl

In the reaction above, the cyanide is

Which of the following compounds is the best possible anti-knock agent for petrol?

The hydrocarbon used in the production of styrene is

How many structural isomers of chlorobutane are possible?

The conversion of open chain alkanes into cycloalkanes and aromatic compounds is called

Which of the following alkanes has the highest boiling point?

Certain useful waxes are composed mainly of

The IUPAC nomenclature of compound CH₃CH₂COOCH₂CH₃ is

When temporary hard water is boiled for sometime in a kettle, the inner surface of the kettle becomes coated with a deposit of

A supersaturated solution is said to contain

The presence of nitrogen in air is to slow down

A good drying agent should be

Smog usually occurs over cities which

What weight of NaCl is needed to make 2.0 dm³ of a 1.5M solution?
[Na = 23, Cl = 35.5]