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.
1.0 mol dm-3
1.5 mol dm-3
2.0 mol dm-3
2.5mol dm-3
5.0mol dm-3
Correct answer is A
No explanation has been provided for this answer.
Which of the following is a condition for a spontaneous reaction?
∆H -T is zero
∆H-T∆ S is positive
∆H-T∆ S is negative
∆S is zero
∆S is positive
Correct answer is C
No explanation has been provided for this answer.
x belongs to group 1, Y belongs to period 2,
x belongs to group 1, Y belongs to period 4
x belongs to group 2, Y belongs to period 1
x belongs to group 3, Y belongs to period 2
x belongs to group 3, Y belongs to period 4
Correct answer is B
No explanation has been provided for this answer.
64g
32g
7.1g
6.4g
3.2g
Correct answer is B
Al has valency of 3+:
3F will deposit 27g
xF will deposit 9g
cross multiply → \(\frac{9g * 3F}{27g}\)
: 1F = 9g
Cu has valency of 2+:
2F will deposit 64g
1F will deposit xg
cross multiply → \(\frac{64g * 1F}{2F}\)
: 1F = 32g
Which of the following statements is not true of tin? it
is a p-block element
is extracted from cassiterite SnO 2
is used for protecting iron containers from corrosion
combines with copper to form the alloy brass
shows two oxidation states, + 2 and + 4 in most of its compounds
Correct answer is D
No explanation has been provided for this answer.