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.
Which of the following metals cannot replace hydrogen from water or steam?
Sodium
Magnesium
Iron
Calcium
Copper
Correct answer is E
No explanation has been provided for this answer.
When each of the nitrates of Potassium, Magnesium and iron is heated,
all the nitrates decompose to their oxides
the nitrate of magnesium gives the nitrite and oxygen
the nitrates of magnesium and iron give the oxides
the nitrate of iron gives the nitrite and oxygen
the nitrate of the magnesium is not decomposed
Correct answer is C
No explanation has been provided for this answer.
The pH of four solutions W, X, Y, Z are 4, 6, 8, 10 respectively, therefore
none of these solutions is acidic
the pH of Y is made more acidic by addition of distilled water
Z is the most acidic solution
W is the most acidic solution
X is neutral
Correct answer is D
W is the most acidic solution since 4 < 6 < 8 < 10. The lower the value on the pH scale, the more acidic a solution.
disintegration
polymerization
cracking
degradation
distillation
Correct answer is C
No explanation has been provided for this answer.
When heat is absorbed during a chemical reaction, the reaction is said to be
thermodynamic
exothermic
isothermal
endothermic
thermostatic
Correct answer is D
No explanation has been provided for this answer.