Ionic Equilibrium Test 10

Total Questions:50 Total Time: 75 Min

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Questions 1 of 50

Question:Review the equilibrium and choose the correct statement $$HCl{O_4} + {H_2}O$$ $$\leftrightarrow$$ $${H_3}{O^ + } + ClO_4^ -$$

$$HCl{O_4}$$ is the conjugate acid of $${H_2}O$$

$${H_3}{O^ + }$$ is the conjugate base of $${H_2}O$$

$${H_2}O$$ is the conjugate acid of $${H_3}{O^ + }$$

$$ClO_4^ -$$ is the conjugate base of $$HCl{O_4}$$

Questions 2 of 50

Question:A solution of $$FeC{l_3}$$ in water acts as acidic due to

Hydrolysis of $$F{e^{3 + }}$$

Acidic impurities

Dissociation

Ionisation

Questions 3 of 50

Question:Which is not a electrophile

$$AlC{l_3}$$

$$B{F_3}$$

$${(C{H_3})_3}{C^ + }$$

$$N{H_3}$$

Questions 4 of 50

Question:Ammonia gas dissolves in water to give $$N{H_4}OH.$$ In this reaction water acts as

An acid

A base

A salt

A conjugate base

Questions 5 of 50

Question:Which of the following is the weakest acid

HF

HCl

HBr

HI

Questions 6 of 50

Question:The degree of dissociation in a weak electrolyte increases

On increasing dilution

On increasing pressure

On decreasing dilution

None of these

Questions 7 of 50

Question:A white substance was alkaline in solution. Which of the following substances could it be

$$F{e_2}{O_3}$$

$$N{a_2}C{O_3}$$

$$N{H_4}Cl$$

$$NaN{O_3}$$

Questions 8 of 50

Question:An aqueous solution of ammonium carbonate is

Weakly acidic

Weakly basic

Strongly acidic

Neither acidic nor basic

Questions 9 of 50

Question:Conjugate base of $$HPO_4^{2 - }$$ is

$$PO_4^{3 - }$$

$${H_2}PO_4^ -$$

$${H_3}P{O_4}$$

$${H_4}P{O_3}$$

Questions 10 of 50

Question:Which of the following is not Lewis acid

$$FeC{l_3}$$

$$AlC{l_3}$$

$$BC{l_3}$$

$$N{H_3}$$

Questions 11 of 50

Question:In the reaction $$BC{l_3} + P{H_3}\, \to \,C{l_3}B - P{H_3},$$ Lewis base is

$$BC{l_3}$$

$$P{H_3}$$

$$C{l_3}B - P{H_3}$$

None of these

Questions 12 of 50

Question:Which of the following statement is true

The conjugate base of a strong acid is a strong base

The conjugate base of a weak acid is a strong base

The conjugate base of a weak acid is a weak base

The base and its conjugate acid react to form a neutral solution

Questions 13 of 50

Question:According to Lewis concept, an acid is a substance which

Accepts protons

Donates protons

Accepts a lone pair of electrons

Donates a lone pair of electrons

Questions 14 of 50

Question:Water is a

Amphoteric acid

Aprotic solvent

Protophobic solvent

None of these

Questions 15 of 50

Question:Aqueous solution of $$AlC{l_3}$$ is

Acidic

Basic

Amphoteric

None of these

Questions 16 of 50

Question:The species which acts as a Lewis acid but not a Bronsted acid is

$$NH_2^ -$$

$${O^{2 - }}$$

$$B{F_3}$$

$$O{H^ - }$$

Questions 17 of 50

Question:The conjugate base in the following reaction $${H_2}S{O_4} + {H_2}O$$ $$\leftrightarrow$$ $${H_3}{O^ + } + HSO_4^ -$$

$${H_2}O$$

$$HSO_4^ -$$

$${H_3}{O^ + }$$

$$S{O_2}$$

Questions 18 of 50

Question:An aqueous solution of aluminium sulphate shows

A basic nature

An acidic nature

A neutral nature

Both acidic and basic nature

Questions 19 of 50

Question:The aqueous solution of $$CuS{O_4}$$ is

Acidic

Basic

Neutral

Amphoteric

Questions 20 of 50

Question:The acid having the highest $$p{K_a}$$ value among the following is

$$HCOOH$$

$$C{H_3}COOH$$

$$ClC{H_2}COOH$$

$$FC{H_2}COOH$$

Questions 21 of 50

Question:Which one of the following is called amphoteric solvent

Ammonium hydroxide

Chloroform

Benzene

Water

Questions 22 of 50

Question:Strongest conjugate base is

$$C{l^ - }$$

$$B{r^ - }$$

$${F^ - }$$

$${I^ - }$$

Questions 23 of 50

Question:Which is the correct representation of the solubility product constant of $$A{g_2}Cr{O_4}$$

$${[A{g^ + }]^2}\,[CrO_4^{ - 2}]$$

$$[A{g^ + }]\,\,[CrO_4^{ - 2}]$$

$$[2A{g^ + }]\,\,[CrO_4^{ - 2}]$$

$${[2A{g^ + }]^2}\,\,[CrO_4^{ - 2}]$$

Questions 24 of 50

Question:Baking soda is

Basic salt

Acidic salt

Complex salt

Double salt

Questions 25 of 50

Question:The solubility of $$BaS{O_4}$$ in water is $$2.33 \times {10^{ - 3}}\,gm/litre.$$ Its solubility product will be (molecular weight of $$BaS{O_4} = 233)$$

$$1 \times {10^{ - 5}}$$

$$1 \times {10^{ - 10}}$$

$$1 \times {10^{ - 15}}$$

$$1 \times {10^{ - 20}}$$

Questions 26 of 50

Question:Hydrolysis of sodium acetate will give

Acidic solution

Basic solution

Neutral solution

Normal solution

Questions 27 of 50

Question:Sodium chloride is purified by passing hydrogen chloride gas in an impure solution of sodium chloride. It is based on

Buffer action

Common ion effect

Association of salt

Hydrolysis of salt

Questions 28 of 50

Question:Why pure $$NaCl$$ is precipitated when $$HCl$$ gas is passed in a saturated solution of $$NaCl$$

Impurities dissolves in $$HCl$$

The value of $$[N{a^ + }]$$and $$[C{l^ - }]$$ becomes smaller than $${K_{sp}}$$ of $$NaCl$$

The value of $$[N{a^ + }]$$and $$[C{l^ - }]$$ becomes greater than $${K_{sp}}$$ of $$NaCl$$

$$HCl$$dissolves in the water

Questions 29 of 50

Question:Solubility product of $$AgCl$$ is $$1 \times {10^{ - 6}}$$ at 298 K. Its solubility in mole $$litr{e^{ - 1}}$$ would be

$$1 \times {10^{ - 6}}mol/litre$$

$$1 \times {10^{ - 3}}mol/litre$$

$$1 \times {10^{ - 12}}mol/litre$$

None of these

Questions 30 of 50

Question:The equivalent conductance at infinite dilution of a weak acid such as $$HF$$

Can be determined by measurement of very dilute $$HF$$ solution

Can be determined by extrapolation of measurements on dilute solutions of $$HCl,\,\,HBr$$ and $$HI$$

Can best be determined from measurements on dilute solutions of $$NaF,\,\,NaCl$$ and $$HCl$$

Is an undefined quantity

Questions 31 of 50

Question:The degree of dissociation of $$0.1\,M\,HCN$$ solution is 0.01%. Its ionisation constant would be

$${10^{ - 3}}$$

$${10^{ - 5}}$$

$${10^{ - 7}}$$

$${10^{ - 9}}$$

Questions 32 of 50

Question:Hydrogen ion concentration in mol/L in a solution of $$pH = 5.4$$ will be

$$3.98 \times {10^8}$$

$$3.88 \times {10^6}$$

$$3.68 \times {10^{ - 6}}$$

$$3.98 \times {10^{ - 6}}$$

Questions 33 of 50

Question:Which of the following 0.1M solution will contain the largest concentration of hydronium ions

$$NaHC{O_3}$$

$$N{H_4}Cl$$

$$HCl$$

$$N{H_3}$$

Questions 34 of 50

Question:1 M $$NaCl$$ and 1 M $$HCl$$are present in an aqueous solution. The solution is

Not a buffer solution with pH < 7

Not a buffer solution with pH > 7

A buffer solution with pH < 7

A buffer solution with pH > 7

Questions 35 of 50

Question:When 10 ml of 0.1 M acetic acid $$(p{K_a} = 5.0)$$ is titrated against 10 ml of 0.1M ammonia solution $$(p{K_b} = 5.0)$$, the equivalence point occurs at pH

5

6

7

9

Questions 36 of 50

Question:The $$pH$$ of $$0.0001\,\,N$$solution of $$KOH$$will be

4

6

10

12

Questions 37 of 50

Question:In a solution of $$pH = 5,$$ more acid is added in order to reduce the $$pH = 2.$$ The increase in hydrogen ion concentration is

100 times

1000 times

3 times

5 times

Questions 38 of 50

Question:A physician wishes to prepare a buffer solution at $$pH = 3.58$$ that efficiently resists changes in $$pH$$ yet contains only small concentration of the buffering agents. Which of the following weak acids together with its sodium salt would be best to use

$$m -$$chlorobenzoic acid $$(p{K_a} = 3.98)$$

$$p -$$chlorocinnamic acid $$(p{K_a} = 4.41)$$

$$2,\,\,5 -$$dihydroxy benzoic acid $$(p{K_a} = 2.97)$$

Acetoacetic acid $$(p{K_a} = 3.58)$$

Questions 39 of 50

Question:Which of the following is not a Bronsted acid

$$C{H_3}NH_4^ +$$

$$C{H_3}CO{O^ - }$$

$${H_2}O$$

$$HSO_4^ -$$

Questions 40 of 50

Question:$$pH$$of 0.005 $$M\,\,{H_2}S{O_4}$$ solution will be

0.005

2

1

0.01

Questions 41 of 50

Question:The $$pH$$of blood is

5.2

6.3

7.4

8.5

Questions 42 of 50

Question:The pH of $${10^{ - 8}}$$molar aqueous solution of $$HCl$$is

$$- 8$$

8

$$6 > 7$$ (Between 6 and 7)

$$7 > 8$$ (Between 7 and 8)

Questions 43 of 50

Question:If the dissociation constant of an acid HA is $$1 \times {10^{ - 5}},$$ the $$pH$$ of a 0.1 molar solution of the acid will be approximately

Three

Five

One

Six

Questions 44 of 50

Question:$$pH$$ value of $$N/10\,\,NaOH$$ solution is

11

12

13

none of these

Questions 45 of 50

Question:One weak acid (like$$C{H_3}COOH$$) and its strong base together with salt (like $$C{H_3}COONa$$) is a buffer solution. In which pair this type of characteristic is found

$$pH$$ and $$NaCl$$

$$NaOH$$ and $$NaN{O_3}$$

$$KOH$$ and $$KCl$$

$$N{H_4}OH$$ and $$N{H_4}Cl$$

Questions 46 of 50

Question:If the pH of a solution of an alkali metal hydroxide is 13.6, the concentration of hydroxide is

Between 0.1 M and 1 M

More than 1 M

Less than 0.001 M

Between 0.01 M and 1 M

Questions 47 of 50

Question:A weak monoprotic acid of 0.1 M, ionizes to 1% in solution. What will be the pH of solution

1

2

3

11

Questions 48 of 50

Question:$${H_4}{O^ + }$$of a solution is 4. The hydroxide ion concentration of the solution would be

$${10^{ - 4}}$$

$${10^{ - 10}}$$

$${10^{ - 2}}$$

$${10^{ - 12}}$$

Questions 49 of 50

Question:Which of the following statement(s) is(are) correct

The $$pH$$ of $$1.0 \times {10^{ - 8}}\,M$$solution of $$HCl$$ is 8

The conjugate base of $${H_2}PO_4^ -$$ is $$HPO_4^{2 - }$$

Autoprotolysis constant of water increases with temperature

When a solution of a weak monoprotic acid is titrated against a strong base, at half neutralization point $$pH = {\textstyle{1 \over 2}}p{K_a}$$

Questions 50 of 50

Question:An aqueous solution of sodium carbnate has a pH greater than 7 becaue

It contains more carbonate ions than $${H_2}O$$ molecules
$$N{a^ + }$$ions react with water
Carbonate ions react with $${H_2}O$$