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.
The following salts will produce a gas on reacting with hydrochloric acid except
ACuSO4
BCaCO3
CFeS
DNa2SO3
EK2CO3
View Explanation & Discuss
Question 2
waec1996
The following are properties of transition metals except
Avariable oxidation states
Btendency to form complext ions
Cformation of coloured ions
Dability to act as catalyst
Elow melting points
View Explanation & Discuss
Question 3
waec1996
The products formed when sodium hydrogen trioxocarbonate (IV) is heated strongly are
Acarbon (IV) oxide and sodium hydride
Bcarbon (IV) oxide and soudium trioxocarbonate (IV)
Csodium trioxocarbonate (IV) and steam
Dcarbon (IV) oxide and steam
Esodium trioxocarbonate (IV) carbon (IV) oxide and steam
View Explanation & Discuss
Question 4
waec1996
What amount of copper is deposited when 13.0g of zinc reacts with excess copper (ll) tetraoxosulphate (IV) solution according to the following equation? Zn (s) + CuSO4(aq) → ZnSO4(aq) + Cu (s) [Cu =63,5, Zn = 65]
A0.1 mole
B0.2mole
C0.3 mole
D0.4 mole
E0.5 mole
View Explanation & Discuss
Question 5
waec1996
Which of the following metals will be the most suitable for use where lightness and resistance to corrosion are of importance?
ALead
BCopper
CIron
DCalcium
EAluminium
View Explanation & Discuss
Question 6
waec1996
Ammonia gas is suitable for performing the 'Fountain' experiment because the gas is
Acolourless
Ba cooling agent
Calkaline to litmus
Da reducing agent
Every soluble in water
View Explanation & Discuss
Question 7
waec1996
Nitrogen is prepared on a large scale by the
Afractional distillation of liquefied air
Bdecomposition of ammonium dioxonitrate (lll)
Celectrolysis of brine
DHaber process
EContact process
View Explanation & Discuss
Question 8
waec1996
What is the role of MnO2 in the reaction represented by the following equation?MnO2 + 4HCI2 + CI2 + 2H2O
ABleaching agent
BOxidizing agent
CAmphoteric oxide
DBasic oxide
ECatalyst
View Explanation & Discuss
Question 9
waec1996
The cleansing action of soap in hard water is not satisfactory because soap
Aforms insoluble calcium and magnesium salts
Bis made from fats and oils
Chas an organic component
Dalters the surface tension of water
Eis a sodium salt of higher carboxylic acids
View Explanation & Discuss
Question 10
waec1996
During water treatment for town supply, water is passed through layers of send beds in order to
Asoften the water
Bfilter the water
Cdecolorize the water
Ddestroy the germs in the water
Ecoagulate colloidal particles in the water
View Explanation & Discuss
Question 11
waec1996
The component of air that can be removed by alkaline pyrogallol solution is
Aoxygen
Bnitrogen
Cwater vapour
Dcarbon (IV) oxide
Enoble gases
View Explanation & Discuss
Question 12
waec1996
Use this following information to answer this question. Compound X was boiled with concentrated hydrochloric acid for a long time. One of the products was found to be a sugar. What type of reaction was involved between compound X and concentrated hydrochloric acid?
APolymerization
BFermentation
CHydrolysis
DNeutralization
EEsterification
View Explanation & Discuss
Question 13
waec1996
Use this following information to answer this question. Compound X was boiled with concentrated hydrochloric acid for a long time. One of the products was found to be a sugar. Compound X was probably
Arubber
Bpolyethene
Cnylon
Dcellulose
Eethanol
View Explanation & Discuss
Question 14
waec1996
Which of the following is a disaccharide?
Afructose
Bstarch
Ccellulose
Dsucrose
Eglycogen
View Explanation & Discuss
Question 15
waec1996
When excess carbon (lV) oxide is passed into lime water, the turbidity produced initially disappears due to the formation of
Acalcium oxide
Bcalcium carbide
Ccalcium hydrogentrioxocarbonate (IV)
Dtrioxocarbonate (IV) acid
Ecalcium trioxocarbonate (IV)
View Explanation & Discuss
Question 16
waec1996
What amount of hydrogen will be required for complete hydrogenation of one mole of pent-3-yne?
A1 mole
B2 moles
C3 moles
D5 moles
E6 moles
View Explanation & Discuss
Question 17
waec1996
When acidified KMnO4 solution is decolorised by ethene, the gas acts as
Aa straight-chain hydrocarbon
Ba saturated hydrocarbon
Ca reducing agent
Da dehydrating agent
Ean oxidizing agent
View Explanation & Discuss
Question 18
waec1996
On exposing palm wine to air for some days, it becomes sour owing to the conversion of
Aglucose to ethanol
Bglucose to gluconic acid
Cethanol to ethanoic acid
Dethanol to ethanal
Epalm wine to palmitic acid
View Explanation & Discuss
Question 19
waec1996
Which of the following exhibits resonance?
ABenzene
BButane
CPentene
DOctana
EHexene
View Explanation & Discuss
Question 20
waec1996
If the third member of a homologous series is C3H8, the fifth member will be
