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.
MnO-4 + 8H+ + ne → Mn++ + 4H2O. Which is the value of n in the reaction above?
2
3
4
5
Correct answer is D
MnO-4 + 8H+ + ne- → Mn++ + 4H2O
Since Mn has 7 electrons on one side and 2 electrons on the other side. The value of ne- is 5.
FeCI 3 and NH 4CI
Na2CO3, CH3COONa and Na,Na2SO4
Na2CO3 and CH3COONa
FeCI3, CH3COONa and NH4CI
Correct answer is C
No explanation has been provided for this answer.
1
2
3
4
Correct answer is B
Q = It = 1.5 x 4 x 60 x 60
13.3 g = 216000 C
118.7 g = (216000 x118.7) / (13.3) = 1927759.4 C
06500 C - 1 mole
1927759.4 C = (1927759.4) / (96500) = 1.998 = 2
2.240 cm 3
22.40 cm 3
224.0 cm 3
2240 cm 3
Correct answer is B
Na2CO3 + 2HCC → 2NaII + H2O
1000 cm3 IM Na2CO3 contains 22400 cm3
10cm3 IM Na2CO3 will contain (10) / (100) x 224
=224 cm3
10 cm3 0.1 Na2CO3 will contain (o.1 x 224) / (1) = 22.4 cm3
How many structural isomers can be written for the alkyl bromide, C4H9Br?
3
4
6
8
Correct answer is B
No explanation has been provided for this answer.