Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
Reduction of nitroalkanes, nitrites and amides is a route for the preparation of
amines
alkenes
polymers
detergents
Correct answer is A
Reduction of nitroalkanes, nitrites and amides is a route for the preparation of amines
A hydrocarbon X with a molar mass of 26 consists of 92.3% carbon. What is its molecular formular?
C2H2
C3H3
C4H4
C5H5
Correct answer is A
% of H2 = 100 - 92.3 = 7.7%
mole = Carbon [92.3 / 12] = 7.7
Hydrogen [7.7 / 1] = 7.7
divide with the lowest:
Carbon - 7.1 / 7.1 = 1
Hydrogen - 7.1 / 7.1 = 1
empirical formula = CH
(CH)n = 26
(12 + 1)n = 26
(13)n = 26
n = 26/13 = 2
molecular formula = C\(_2\)H\(_2\)
The IUPAC nomenclature for the structure above is
2, 3 - dichloro - 4, 4, 5 - trimethyl pent - 2 - ene
4, 5 - dichloro - 2, 3 - dimethyl hex - 2 - ene
2, 3 - dichloro - 4, 4 - dimethyl hex - 2- ene
2, 3 dichloro - 2, 2 - dimethyl hex - 2 - ene
Correct answer is C
The longest carbon chain in the compound is the hex-2-ene.
Counting all the attachments, the IUPAC nomenclature of the compound is 2,3 - dichloro-4,4- dimethyl hex-2-ene.
If glucose is heated with concentration tetraoxosulphate (VI) acid, it will be dehydrated to
carbon
carbon (IV) oxide
ethene
ethanol
Correct answer is A
If glucose is heated with concentrated tetraoxosulphate(VI)acid, it will be dehydrated to carbon.
If the silver mirror test is positive, it indicates the presence of an
alkyne
alkanol
alkanone
alkanal
Correct answer is D
Alkanals give a positive result for the silver mirror test(Tollen's reagent).
The type of isomerism shown by cis- and trans- isomers is
optical isomerism
positional isomerism
functional isomerism
geometrical isomerism
Correct answer is D
The type of isomerism shown by the cis- and trans- isomers is geometrical isomerism
The most common ores of iron include
haematite, malachite and limonite
chalcocite, calamine and bornite
magnetite, haematite and limonite
magnetite, chalcocite and bornite
Correct answer is C
The most common ores of iron are magnetic, haematite and limonite
which of the following gives a precipitate when treated with NaOH solution?
AlCl3
NH4Cl
Na2CO3
CH3COONa
Correct answer is A
Sodium hydroxide reacts with aluminium chloride to form a precipitate; aluminium hydroxide ; AlCl3 (Alumunium chloride).
Leads is used for making bullets and lead shots because of its
resistance to corrosion
low melting point
high density
flexibility
Correct answer is C
Lead is used for making bullets and lead shots because of its high density.
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