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.
90 and 234 respectively
91 and 238 respectively
92 and 236 respectively
93 and 238 respectively
Correct answer is A
23892 X 234 90Y + 4 2 He Atomic number is 90 while mass number is 234
How many orbitals are in the d-sub shell?
1
3
5
7
Correct answer is C
No explanation has been provided for this answer.
In which of the following processes is biotechnology not applied?
Manufacture of drugs
Treatment of domestic sewage
Production of alcoholic beverages
Electroplating of metals
Correct answer is D
No explanation has been provided for this answer.
Which of the following substance is an alloy of lead?
Brass
Duralumin
Stainless steel
Soft solder
Correct answer is D
No explanation has been provided for this answer.
Which of the following pairs of solutions will produce a precipitate when mixed?
Pb(NO3)2(aq) and NaCI(aq)
MgSO4(aq) and HCI(aq)
ZnCI2(aq) and NaSO4(aq)
NaOH(aq) and HNO3(aq)
Correct answer is A
\(Pb(NO_3)_{2(aq)} + 2NaCl → PbCl_2 + 2NaNO_3\) Option A will produce insoluble lead(II) chloride.( precipitate)
Hardness in water can be removed by adding
copper (ll) tetraoxosulphate (IV)
sodium trioxocarbonate (IV)
sodium chloride
alum
Correct answer is B
No explanation has been provided for this answer.
Ethyne undergoes the following reactions except
polymerisation
addition
substitution
esterification
Correct answer is D
No explanation has been provided for this answer.
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