Free Printable Acid-base (1)

1.

$NH_4\ +\ H_2O\ \leftrightarrow\ ...........\ +\ ............\ ?$

a)

$NH_3^-\ \ +\ OH^-$

b)

$NH_{3\ }^-+\ OH^+$

c)

$NH_3^-+H_3O^-$

d)

$NH_3^-+H_3O^+$

2.

Which of the following substances is both a Brønsted-Lowry base and an Arrhenius base?

a)

NH₃(s)

b)

NH₃(aq)

c)

HCl(g)

d)

HCl(aq)

3.

A substance that increases the concentration of OH^- ions in an aqueous solution is known as a(n)

a)

Arrhenius acid.

b)

Arrhenius base.

c)

Lewis acid.

d)

Lewis base.

4.

The conjugate base of

H_2PO_4^-

is

a)

$H_3PO_4$

b)

$H_2PO_4^-$

c)

$HPO_4^{-2}$

d)

$PO_4^{-3}$

5.

Which are the set of amphiprotic species?

a)

$H_2O,H_2PO_4^-,HPO_4^{-2}$

b)

$HPO_4^{-2},HCO_3^-$

c)

$H_2PO_2^-,H_2PO_3^-,HC_2O_4^-$

d)

$HPO_3^{-2},H_2O,CO_3^{-2}$

6.

Classify this acid.

a)

Arrhenius Acid

b)

Bronsted Lowry Acid

c)

Lewis Acid

7.

According to the Brønsted-Lowry theory, a base is a substance that exhibits a tendency to ...

a)

donate an electron

b)

accept a proton

c)

donate a proton

d)

accept an electron

8.

Classify this acid.

a)

Arrhenius Acid

b)

Bronsted Lowry Acid

c)

Lewis Acid

9.

Classify the following molecule

a)

Lewis Acid

b)

Lewis Base

10.

phosphorous acid

a)

H₃PO₄

b)

H₂PO₄

c)

H₃P

d)

H₃PO₃

11.

Mg(OH)₂

a)

magnesium hydroxide acid

b)

hydromagnesium acid

c)

magnesium oxygen hydride

d)

magnesium hydroxide

12.

chloric acid

a)

HClO₃

b)

HClO₂

c)

HClO

d)

HCl

13.

nitrous acid

a)

H₂NO₃

b)

HNO₃

c)

HNO₂

d)

H₂NO₂

14.

Which of the following is the correct definition for a strong acid?

a)

Partially dissociates into ions when dissolved in water and the change is not reversible

b)

Fully dissociates into ions when dissolved in water and the change is not reversible

c)

Fully dissociates into ions when dissolved in water and the change is reversible

d)

Partially dissociates into ions when dissolved in water and the change is reversible

15.

Which of the following is the correct balanced equation showing the dissociation of sulfuric acid into ions?

a)

H₂SO₄ (aq) → H⁺ (aq) + SO₄^–(aq)

b)

H₂SO₄ (aq) ⇌ 2H⁺ (aq) + SO₄^2-(aq)

c)

HSO₄(aq) → H⁺(aq) + SO₄^–(aq)

d)

H₂SO₄ (aq) → H⁺ (aq) + HSO₄^-(aq)

16.

Methanoic (HCOOH) is a

a)

Weak Acid

b)

Weak Base

c)

Strong Acid

d)

Strong base

17.

Ammonia (NH₃) is a

a)

Weak Acid

b)

Weak Base

c)

Strong Acid

d)

Strong base

18.

What is the chemical name for Sr(OH)₂?

a)

strontium hydroxide

b)

strontium hydride

c)

strontium (II) hydroxide

d)

strontium oxide

19.

What is the correct chemical name for NH₄OH?

a)

ammonium hydride

b)

ammonia hydroxide

c)

ammonium hydroxide

d)

ammonia hydride

20.

What is the formula for perchloric acid?

a)

H₃ClO₃

b)

H₃ClO₄

c)

HClO₃

d)

HClO₄

21.

For this reaction :

B(aq) + H₂O(l) ⇌ BH⁺(aq) + OH^-(aq)

Which one is base-conjugated acid pair ?

a)

B(aq) and BH⁺(aq)

b)

B(aq) and OH^-(aq)

c)

H₂O(l) and BH⁺(aq)

d)

H₂O(l) and OH^-(aq)

22.

dissociation of weak acid, HA, is represented by following equation :

HA(aq) + H₂O(l) ⇌ H₃O⁺(aq) + A^-(aq)

The equilibrium constant for this reaction is represented by K_a . Which of the following equation represents expression of equilibrium constant, K_a?

a)

b)

c)

d)

23.

For this reaction :

HA(aq) + H₂O(l) ⇌ H₃O⁺(aq) + A^-(aq)

Which one can act as an acid ?

a)

HA(aq) and A^-(aq)

b)

H₂O(l) and H₃O⁺(aq)

c)

HA(aq) and H₃O⁺(aq)

d)

H₂O(l) and A^-(aq)

24.

Which one IS TRUE about dissociation of weak base in water ?

1.[H⁺] ions = [OH^-] ions in weak base-containing solution

2.The numerical value of Equilibrium constant of dissociation of weak base, K_b, decrease as the temperature decrease

3.Weak base are less dissociated in solution as the amount of concentration of common-ion OH^- in solution increase

4.pH > 7 in weak base-containing solution

a)

1, 2, 3, and 4

b)

1, 2, and 3

c)

2, 3, and 4

d)

2 and 4

e)

2 and 3

25.

Which one IS TRUE about dissociation of weak acid in water ?

1.[H⁺] ions > [OH^-] ions in weak acid-containing solution

2.The numerical value of Equilibrium constant of dissociation of weak acid, K_a, increase as the temperature decrease

3.It makes light bulb glow very bright

4.pOH > 7 in weak acid-containing solution

a)

1, 2, 3 and 4

b)

1,2, and 3

c)

1,2, and 4

d)

2,3 and 4

e)

1,3 and 4

Acid-base (1)

Total questions: 25

Worksheet time: 47mins

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