Study and practice Chemistry past questions with answers and detailed explanations. Then test your knowledge using our interactive CBT practice platform and prepare confidently for your upcoming examinations.
When excess chlorine is mixed with ethene at room temperature, the product is
A1,2 - dichloroethane
B1,2 - dichloroethene
C1,1 - dichloroethane
D1, 1 - dichloroethene
View Explanation & Discuss
Question 983
jamb1989
Which of the following is NOT involved in the extraction of metals from their ores?
Areduction with carbon
Breduction with other metals
Creduction by electrolysis
Doxidation with oxidizing agents
View Explanation & Discuss
Question 984
jamb1989
Mortar is NOT used for under-water construction because
Ait hardens by lose of water
Bits hardening doe not depend upon evaporation
Cit requires concrete to harden
Dit will be washed away by the flow of water
View Explanation & Discuss
Question 985
jamb1989
A metal is extracted from its ore by the electrolysis of its molten chloride and it displaces lead from lead (ll) trioxonitrate (V) solution. The metal is
Acopper
Baluminium
Czinc
Dsodium
View Explanation & Discuss
Question 986
jamb1989
The scale of a chemical balance is made of iron plate and coated with copper electrolytically because
Airon is less susceptible to corrosion than copper
Bcopper is twice as less susceptitible to corrosion as iron
Ccopper is less susceptible to corrosion than iron
Dcopper and iron are equally susceptible to corrosion
View Explanation & Discuss
Question 987
jamb1989
The products of the thermal decomposition of ammonium trioxonitrate (V) are
ANO 2 and oxygen
BNH3 and oxygen
Cnitrogen and water
DN2O and water
View Explanation & Discuss
Question 988
jamb1989
Bleaching powder, CaOCI2, H2O, deteriorates on exposure to air because
Ait loses its water of crystallization
Batmospheric nitrogen displaces chlorine from it
Ccarbon (IV) oxide of the atmosphere displaceschlorine from it
Dbleaching agents should be stored in solution
View Explanation & Discuss
Question 989
jamb1989
Which of the following reactions is (are) feasible?
I Br (l) + 2CI\(_2\)(aq) → 2Br(aq) + CI\(_2\)(g)
ll 2 I (aq) + Br\(_2\)(L) → 2Br (aq) + I\(_2\)(s)
lll 2F (aq) + CI\(_2\)(g) → 2CI (aq) + F\(_2\)(g)
IV 2F(aq) + Br\(_2\)(l) → 2Br (aq) + F\(_2\)(g)
Al
Bll
Cl and lll
Dlll and lV
View Explanation & Discuss
Question 990
jamb1989
Gunpower is made from charcoal, sulphur and potassium trioxonitrate (V) The salt in the mixture performs the function of
Aan oxidant
Ba reductant
Ca solvent
Da catalyst
View Explanation & Discuss
Question 991
jamb1989
Some products of destructive distillation of coal are?
Acarbon (IV) oxide and ethanoic acid
Btrioxocarbonate (IV) acid and methanoic acid
Cproducer gas and water gas
Dcoke and ammoniacal liquor
View Explanation & Discuss
Question 992
jamb1989
The catalyst used in the contact process for the manufacture of tetraoxosulphate (VI) acid is
Amanganes (IV) oxide
Bmanganese (ll) tetraoxosulphate (VI)
Cvanadium (V) oxide
Diron metal
View Explanation & Discuss
Question 993
jamb1989
Which of the following represents the balanced equation for the reaction of copper with concentrated trioxonitrate (V) acid?
ACu (s) + 2HNO 3(aq) → Cu (NO 3) 2(aq) + H 2(g)
BCu (s) + 4HNO 3(aq) → Cu (NO 3) 2(aq) + 2H 2O (1) + 2NO 2(g)
The combustion of ethene, C 2H 4, is given by the equation C 2H 4 + 30 2 → 2CO2 + 2H2 O; ∆H = - 1428 KJ. If the molar heats of formation of water and carbon (IV) oxide are - 286 kJ and - 396 kJ respectively, calculate the molar heat of formation of ethene in KJ
A- 2792
B+ 2792
C- 64
D+ 64
View Explanation & Discuss
Question 995
jamb1989
An element, Z froms an anion whose formula is [Z(CN)6]y. If Z has an oxidation number of +2, what is the value of y?
A- 2
B- 3
C- 4
D- 5
View Explanation & Discuss
Question 996
jamb1989
What is discharged at the cathode during the electrolysis of copper (ll) tetraoxosulphate (VI) solution?
ACu 2+ only
BH + only
CCu 2+ and H
DCu 2+ and SO 2-
View Explanation & Discuss
Question 997
jamb1989
The same current is passed for the same time through solutions of AgNO3 and CuSO4 connected in series. How much silver will be deposited if 1.0 g of copper is produced?
[Cu = 63.5, S = 32, O = 16, Ag = 108, N = 14]
A1.7 g
B3.4 g
C6. 8 g
D13. 6 g
View Explanation & Discuss
Question 998
jamb1989
An acid and its conjugate base
Acan neutralise each other to form a salt
Bdiffer only by a proton
Cdiffer only by the opposite charges they carry
Dare always neutral substances
View Explanation & Discuss
Question 999
jamb1989
The substance ZnO dissolves in sodium hydroxide solution and mineral acid solution to give soluble products in each case. ZnO is therefore referred to as
Aan allotropic oxide
Ban amphoteric oxide
Ca peroxide
Da dioxide
View Explanation & Discuss
Question 1000
jamb1989
A solution of calcium bromide contains 20 g dm\(^3\). What is the molarity of the solution with respect to calcium bromide and bromide ions? [Ca = 40, Br = 80]
