ACIDS AND BASES QUIZ. Click to start. A. It is concentrated. B. It does dissociate in water. C. It almost completely dissociate in water. It absorbs water from the air. D. Question 1. Which one of the followig descriptions defines a strong acid?. Wrong Answer!.
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It is concentrated.
It does dissociate in water.
It almost completely dissociate in water.
It absorbs water from the air.
Which one of the followig descriptions defines a strong acid?
A strong acid is almost completely dissociated.
HA(aq) H+(aq) + A-(aq)
Zn + H2SO4 ZnSO4 + H2
4Zn + H2SO4 4ZnO + H2S
Zn + 2H2SO4 2ZnS + 2H2O + 3O2
Zn + H2SO4 ZnH2 + SO2 + O2
Which of the following represents the reaction between zinc powder and a dilute aqueuous solution of sulfuric acid?
Metals react with acids to form hydrogen and salt.
When the following 1.0 moldm-3 solutions are listed in increasing order of pH (lowest first), what is the correct order ?
strong acid < weak acid < weak base < strong base
The amino acid alanine has the structure:
Which of the following species represents its conjugate acid ?
The conjugate acid is formed by protonation of the amino group
In the equilibrium below, which species represents a conjugate acid-base pair?
CH2ClCOOH(aq) + H2O(l) CH2ClCOO-(aq) + H3O+(aq)
A conjugate acid-base pair differ by a proton (H+)
Hydrogen chloride does not form ions in water.
Ethanol accepts hydrogen ions (protons) and water does not.
Magnesium is very soluble in ethanol but insoluble in water.
Water is a hydrogen ion/proton acceptor
Hydrogen chloride dissolved in water reacts with magnesium. Hydrogen chloride dissolved in ethanol does not react with magnesium. Which statement accounts for this observation?
Acid behaviour is observed in water since the water molecule is a strong base (proton acceptor) and forms hydronium ions, H3O+.
Benzenecarboxylic acid solution has a high concentration of ions.
Benzenecarboxylic acid is only slightly dissociated in water.
Benzenecarboxylic acid is completely dissociated in water.
It is a strong acid.
A dilute aqueous solution of benzenecarboxylic acid (an organic acid) is a poor conductor of electricity. Which of the following statements accounts for this observation?
The low concentration of ions accounts for its low conductivity.
A decrease in the H+ concentration and an increase in the OH- concentration.
An increase in the OH- concentration and an increase in the H+ concentration.
A decrease in the H+ concentration with no change in the OH- concentration.
An increase in the H+ concentration and a decrease in the OH- concentration.
A decrease in the pH of an aqueous solution corresponds to:
A decrease in pH correlates to an increase in the hydrogen ion concentration.
An increase by a factor of 2.
An increase by a factor of 100.
A decrease by a factor of 2.
A decrease by a factor of 100.
Calcium oxide is added to a lake to neutralise the effects of acid rain. The pH value of the lake water rises from 4 to 6. What is the change in concentration of [H+(aq)] in the lake water?
pH and [H+] are inversely related. An increase in the pH by a value of 1 corresponds to x10 decrease in the H+
Such a species does not exist.
Which of the ions behave as a BrØnsted – Lowry base and as a BrØnsted – Lowry acid?
HSO4- SO4- + H+
HSO4- + H+ H2SO4
[H+] in X is half that in Y.
[H+] in X is twice that in Y.
[H+] in X is ten times that in Y.
[H+] in X is a hundred times that in Y.
The pH of solution X is 1 and that of Y is 2. Which statement is correct about the hydrogen ion concentrations in the two solutions?
A change in pH of 1 unit corresponds to a change of x10 in the concentration of hydrogen ions.
HNO3 H+ + NO3-
HNO3 + 2H2SO4 NO2+ + 2HSO4- + H3O+
HNO3 + CH3COOH CH3COOH2+ + NO3-
HNO3 + H2O H3O+ +NO3-
In which of the following reactions does the nitric acid molecule act as a base?
The sulfuric acid molecule is deprotonated.
0.2 mol Na2CO3
0.1 mol NH3
0.1 mol Ba(OH)2
0.1 mol KOH
Which of the following would exactly neutralise 100cm3 of 1 mol dm-3 sulfuric acid?
H2SO4 + Ba(OH)2 BaSO4 + 2H2O
0.1 mol of sulfuric acid reacts with 0.1 mol of barium hydroxide.
Which is not a strong acid?
Carbonic acid is a weak acid
Which equation correctly describes phosphoric(V) acid behaving as a monoprotic acid in aqueous solution?
A monoprotic acid releases 1 hydrogen ion per molecule in water.
A Lewis acid (only)
A Lewis base (only)
A BrØnsted – Lowry base (only)
Both a BrØnsted – Lowry base and a Lewis base
Ammonia molecules in aqueous solution can be considered as:
The ammonia molecule has an available lone pair of electrons and is able to accept a hydrogen ion and form the ammonium ion (via a dative bond form).
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