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Acids and Bases: The Ion Story

Section A: Acids, Bases and Ions

Question 1mcq
An acid furnishes which ion in aqueous solution?
A.Cl−Cl^-
B.Na+Na^+
C.OH−OH^-
D.H+H^+
Question 2mcq
A base furnishes which ion in aqueous solution?
A.Cl−Cl^-
B.OH−OH^-
C.H+H^+
D.CO32−CO_3^{2-}
Question 3mcq
Why does dry HClHCl gas not turn dry blue litmus red?
A.It contains OH−OH^- ions
B.It is not acidic in any form
C.It does not produce H+H^+ ions without water
D.Litmus works only in sunlight
Question 4mcq
Acids and bases conduct electricity in water mainly because they contain:
A.Only coloured particles
B.Mobile ions
C.Only undissolved solids
D.Only neutral molecules
Question 5mcq
Which aqueous solution is expected to contain OH−OH^- ions?
A.CO2(g)CO_2(g)
B.NaOH(aq)NaOH(aq)
C.HCl(aq)HCl(aq)
D.H2SO4(aq)H_2SO_4(aq)
Question 6mcq
Pure dry hydrogen chloride does not conduct electricity well because:
A.It has no mobile ions
B.It has too many electrons
C.It is always neutral
D.It contains sodium ions

Section B: Strength and Concentration

Question 7mcq
A strong acid is one that:
A.Has no ions
B.Ionises almost completely in water
C.Has a dark colour
D.Is always highly concentrated
Question 8mcq
A weak acid is one that:
A.Always has pH 7
B.Ionises partially in water
C.Cannot be concentrated
D.Contains no hydrogen
Question 9mcq
A concentrated acid means:
A.It has no water
B.More acid is dissolved in a given amount of solution
C.It is always safe
D.It is always strong
Question 10mcq
Which statement is correct?
A.Strong means physically thick
B.Every dilute acid is weak
C.Every concentrated acid is strong
D.A dilute acid can still be strong if it ionises almost completely
Question 11mcq
At the same concentration, a strong acid conducts better than a weak acid because it:
A.Is hotter
B.Has no water
C.Produces more ions
D.Has a stronger smell
Question 12mcq
Which pair is correctly matched?
A.Weak acid — no ionisation
B.Dilute acid — always pH 7
C.Concentrated acid — always weak
D.Strong acid — high degree of ionisation