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.
AReaction of carboxylic acids with sodium hydroxide
BReaction of alkanoates with acid
CReaction of alkanoates with alcohols
DReaction of alkanoates with sodium hydroxide
View Explanation & Discuss
Question 882
jamb1993
Catalytic hydrogenation of benzene produces?
Aan aromatic hydrocarbon
Bmargarine
Ccyclohexane
DD.D.T
View Explanation & Discuss
Question 883
jamb1993
Palm wine turns sour with time because?
Athe sugar content is converted into alcohol
Bthe carbon (IV) oxide formed during the fermentation process has a sour taste
Cit is commonly adulterated by the tappers and sellers
Dmicrobial activity results in the production of orgain acids within it
View Explanation & Discuss
Question 884
jamb1993
The carbon atoms on ethane are?
Asp2 hybridized
Bsp3 hybridized
Csp2d hybridized
Dsp hybridized
View Explanation & Discuss
Question 885
jamb1993
Al2O3(s) + 3H2SO4(aq) → Al2(SO4(aq)) + 3H2(I)O
Al2O3(s) + 2NaOH(aq)) + 3H2(I)O → 2NaAl(OH)4(aq)).
We can conclude from the equations above that Al2O3(s) is?
Aan acidic oxide
Ban amphoteric oxide
Ca basic oxide
Da neutral oxide
View Explanation & Discuss
Question 886
jamb1993
It is not desirable to use lead tetraethyl as an anti-knock agent because?
Ait is expensive
Bof pollution effects from the exhaust fumes
Cit lowers the octane rating of petrol
Dit is explosive
View Explanation & Discuss
Question 887
jamb1993
The fraction of crude oil used as jet fuel is?
Arefinery gas
Bdiesel oil
Ckerosene
Dgasoline
View Explanation & Discuss
Question 888
jamb1993
The active reducing agent in the blast furnace for the extraction of iron is?
Acarbon
Blimestone
Ccarbon(II)oxide
Dcalcium oxide
View Explanation & Discuss
Question 889
jamb1993
Bronze is an alloy of?
Asilver and copper
Bsilver and gold
Ccopper and nickle
Dcopper and zinc
Ecopper and tin
View Explanation & Discuss
Question 890
jamb1993
When dilute aqueous solutions of lead (II) nitrate and potassium bromide are mixed, a precipitate is observed.
The products of this reaction are?
APbO(s) + Br- + KNO3
BBr2 + NO2(g) + PbBr2(s)
CPbO(s) + K+(aq) + Br(aq) + NO2(g)
DPbBr2(s) + K(aq) + K+(aq) + NO3(aq)
View Explanation & Discuss
Question 891
jamb1993
Which of the following is a property of ionic chlorides?
AThey can be decomposed by heat
BThey react with aqueous AgNO3 to give a white precipiate which is soluble in excess ammonia
CThey explode when in contact with dry ammonia
DThey react with concentrated tetraoxosulphate (IV) acid to give white fumes of chlorine gas
View Explanation & Discuss
Question 892
jamb1993
An experiment produces a gaseous mixtures of carbon (IV) oxide and carbon (II) oxide. In order to obtain pure carbon (II) oxide, the gas mixture should be?
Apassed over heated copper (II) oxide
Bbubbled through concentrated tetraoxosulphate (IV) acid
Cbubbled through sodium hydroxide solution
Dbubbled through water
View Explanation & Discuss
Question 893
jamb1993
Which of these salts will produce its metal, oxygen and nitrogen (IV) oxide on heating?
ASilver and trioxonitrate (V)
BSodium trioxonitrate (V)
CCalcium trioxonitrate (V)
DLithium trioxonitrate (V)
View Explanation & Discuss
Question 894
jamb1993
Which of these gases can be dried with concentrated H2SO4?
AHBr
BH2S
CNH3
DSO2
View Explanation & Discuss
Question 895
jamb1993
NaCI(s) + H2SO4(I) → HCI(g) + NaHSO4(s).
In the reaction above, H2SO4 behaves as?
Aa strong acid
Ban oxidizing agent
Ca good solvent
Da dehydrating agent
View Explanation & Discuss
Question 896
jamb1993
10g of a solid is in equilibrium with its own vapour.
When 1 g of a small amount of solid is added, the vapour pressure?
Aremains the same
Bdrops
Cincreases by 1%
Dincreases by 99%
View Explanation & Discuss
Question 897
jamb1993
The standard enthalpies of formation of CO2(g), H2O(g) and CO(g) in kJ mol- are -394, -242 and -110 respectively. What is the standard enthalpy change for the reaction CO(g) + H2(g)O → CO2(g) + H2(g)?
A-42 KJ mol-
B+42 KJ mol-
C-262 KJ mol-
D+262 KJ mol-
View Explanation & Discuss
Question 898
jamb1993
A reaction takes places spontaneously if?
A∆G = O
B∆S < O and ∆H > O
C∆H < T ∆S
D∆G > O
View Explanation & Discuss
Question 899
jamb1993
The oxidation states of chlorine in HOCL, HCLO3 and HCLO4 are respectively?
A-1, +5, and +7
B-1, -5 and 7
C+1, +3 and +4
D+1, +5 and +7
View Explanation & Discuss
Question 900
jamb1993
Which of the reactions occurs at the anode during the electrolysis of a very dilute aqueous solution of sodium chloride?
