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.
a decrease in pressure
an increase in pressure
a decrease in temperature
an introduction of a positive catalyst
Correct answer is A
The equilibrium position is shifted to the left with a decrease in pressure in this system because the number of gaseous molecules on the right is less. (Le-Chatelier's principle).
Ethene is produced from ethanol by
decomposition
hydrolysis
ozonolysis
dehydration
Correct answer is D
Ethene can be gotten from the dehydration of ethanol in the presence of excess \(H_{2}SO_{4}\) or \(H_{3}PO_{4}\).
Consider the following reaction equation: \(Br_{2} + 2KI \to 2KBr + I_{2}\). Bromine is acting as
an oxidizing agent
a reducing agent
an acid
a base
Correct answer is A
No explanation has been provided for this answer.
\(C_{2}H_{4}\)
\(C_{3}H_{4}\)
\(C_{3}H_{6}\)
\(C_{4}H_{8}\)
Correct answer is C
Given the molecular formula, \(CH_{2}\).
The empirical formula will be \((CH_{2})n\)= 42
\((12+(2\times1))n =42\)
⇒ \(14n =42\)
n = 3, hence the empirical formula is \(C_{3}H_{6}\)
In which of the following compounds does hydrogen form ionic compounds?
CH\(_{4}\)
HCl
NH\(_{3}\)
NaH
Correct answer is D
The bonding between a non-metal and a metal is an ionic bonding. In metal hydrides, Hydrogen takes on the ionic charge of -1, hence forming an ionic bond with the metals.