JAMB Chemistry 1993 past questions

An element, E, has the electronic configuration 1s22s22p63s23p3. The reaction of E with a halogen X can give.

Two atoms represented as 235 92Uand 238 92U are

As the difference in electronegativity between bonded atoms increase, polarity of the bond

Water has a rather high boiling point despite its low molecular mass because of the presence of

Argon is used in gas-filled electric lamps because it helps to

The air around a petroleum refinery is most likely to contain

Water can be identified by the use of

The phenomenon whereby sodium trioxocarbonate (1) decahydrate loses some of its water crystallization on exposure to the atmosphere is known as

For which salt in the graph above does the solubility increase most rapidly with rise in temperature

NH3 + H3O NH4 + H2O. it may be deduced from the reaction above that

4.0 g of sodium hydroxide in 250 cm3 of solution contains

Which of the following reactions occurs at the anode during the electrolysis of a very dilute aqueous solution of sodium chloride?

Half – cell reaction E0 Cu2+(aq) + 2e Cu(s) +0.34V Fe2+(aq) + 2e Fe -0.44V Ba2+(aq) + 2e Ba(s) -2.90V Zn2+(aq) + 2e Zn(s) -0.76V From the data above, it can be deduced that the most powerful reducing agent of the four metals is

The oxidation states of chlorine in HOCl, HClO3 and HClO4 are respectively

The standard enthalpies of formation of CO2(g), H2O(g) and CO(g) in kJ mol-1 are –394, -242 and –110 respectively. What is the standard enthalpy change for the reaction CO(g) + H2O CO2(g) + H2(g)?

10 g of a solid is in equilibrium with its own vapour. When 1 g of a small amount of solid is added, the vapour pressure

In the diagram above, curve X represents the energy profile for a homogeneous gaseous reaction. Which of the following conditions would produce curve Y for the same reaction?

NaCl(s) + H2SO4(1) HCl(g) + NaHSO4(s). In the reaction above. H2SO4 behaves as

Which of these salts will produce its metal, oxygen and nitrogen(1V) oxide on heating?

An experiment produces a gaseous mixture of carbon (1V) oxide and carbon(11) Oxide. In order to obtain pure carbon (11) oxide, the gas mixture should be

Which of the following is property of ionic chlorides?

When dilute aqueous solutions of (11) nitrate and potassium bromide are mixed, a precipitate is observed. The products of this reaction are.

Bronze is an alloy will react to

Copper metal will react with concentrated trioxonitrate (V) acid to give

The active reducing agent in the blast furnace for the extraction of iron is

Al2O3(s) + 3H2SO4(aq)=Al2(SO4)3(aq) + 3H2O(1) Al2O3(s) + 2NaOH(aq) + 3H2O (1) ’! 2NaAl(OH)4(aq). We can conclude from the equations above that Al2O3(s) is

The fraction of crude oil used as jet fule is

CH3CHCH2CHCH2CH3 CH3 CH3. The IUPAC nomenclature for the compound above is.

It is not desirable to use lead tetraethyl as an anti- knock agent because

The carbon atoms on ethane are

O O CH3 C-OCH2CH2 and CH3CH2CH2 C-OH are

Palm wine turns sour with time because.