Chemistry is the study of the substances that make up matter. It looks at their properties, how they react with each other, and how these reactions can create new substances.
-
Question 21: The isomers of C3H8O ARE
Options:
A) 1 - propanol and 2 - propanol
B) 1 - propanol and 1 - propanol
C) 2 - propanol and 2 - propanone
D) 2 - propanol and 1 - propanol
Show Answer
The correct answer is A .
-
Question 22:
To what volume must 300cm of 0.60M sodium hydroxide solution be diluted to give a 0.40M solution?
Options:
A) 450cm
B) 300cm
C) 200cm
D) 150cm
Show Answer
The correct answer is A .
-
Question 23:
Which halogen is a gas at room temperature and is pale yellow in color?
Options:
A) Chlorine (Cl)
B) Fluorine (F)
C) Iodine (I)
D) Bromine (Br)
Show Answer
The correct answer is B .
-
Question 24:
At what temperature is the solubility of potassium trioxonitrate(V ) equal to that of sodium trioxonitrate (V)?
Options:
A) 0c
B) 30c
C) 40c
D) 45c
Show Answer
The correct answer is D .
-
Question 25:
Addition of sodium chloride to water to form a solution would lead to?
Options:
A) increase in freezing point and increase the boiling point
B) increase in freezing point and decrease the boiling point
C) decrease in freezing point and decrease the boiling point
D) decrease in freezing point and increase the boiling point
Show Answer
The correct answer is D .
-
Question 26: Which of the following statements is true? When the potassium atom forms its ion
Options:
A) it gains one electron and becomes neutral
B) its atomic number decreases
C) it achieves electronic configuration of orgon
D) it loses one proton
E) it loses one neutron
Show Answer
The correct answer is C .
-
Question 27: A suitable reagent for distinguishing between ethanoic acid ethanol is
Options:
A) bromine water
B) Fehling's solution
C) sodium hydrogentrioxocarbonate (IV)
D) ammoniacal silver trioxonitrate (V)
Show Answer
The correct answer is C .
-
Question 28: In which of the following is the entropy change positive?
Options:
A) H2O(I) → H2O(g)
B) Cu2+(aq) + Fe(s) → Fe(2+) + Cu(s)
C) N2(g) + 3H2(g) → 2NH3(g)
D) 2HCI(s) → H2(g) + CI2(g)
Show Answer
The correct answer is A .
-
Question 29:
The IUPAC nomenclature of the compound above is
Options:
A) 2-ethylpentane
B) 3,4-dimethylhexane
C) 2,3-dimethylhexane
D) 2-ethylhexane
Show Answer
The correct answer is B .
-
Question 30:
4g each of aluminium foil and aluminium powder were introduced respectively into flasks P and Q.
Flask P was treated with warm bench sodium hydroxide and all the aluminium dissolved in one hour. Flask Q was treated with cold sodium hydroxide and all the aluminium dissolved in 10 minutes. What was responsible for Q reacting faster than P?
Options:
A) There were more aluminium atoms in Q than P
B) The heat given off in retarded the reaction
C) Q generated more pressure than P during the reaction
D) P generated more pressure than Q
E) Q has a greater surface area for the reaction than P
Show Answer
The correct answer is E .