پرسیاری وزاری کیمیا 2020-2021 خولی دووەم ، خوێندنی ئینگلیزی

The pH of an aqueous solution composed 2×10^-4mol of ⁺H₃O
ions in 250 mL of its solution is equal to

3.1

Correct Incorrect Correct answer

3.7

Correct Incorrect Correct answer

10.9

Correct Incorrect Correct answer

10.3

Correct Incorrect Correct answer

Which of the following is the equilibrium constant for an anion hydrolysis reaction

[HB][OH-]/[B-]

Correct Incorrect Correct answer

[B-]/[HB][OH-]

Correct Incorrect Correct answer

[HB]/[B-][OH-]

Correct Incorrect Correct answer

[B-][OH-]/[HB]

Correct Incorrect Correct answer

The solution that contains the precisely known concentration of a solute is known as

saturated solution

Correct Incorrect Correct answer

dilute solution

Correct Incorrect Correct answer

standard solution

Correct Incorrect Correct answer

buffer solution

Correct Incorrect Correct answer

A solution made from ethanol ,C₂H₅OH,and water is 1.76m in ethanol

? How many moles of ethanol are contained per 250g of water

0.142mol

Correct Incorrect Correct answer

0.44mol

Correct Incorrect Correct answer

20.24mol

Correct Incorrect Correct answer

7.04mol

Correct Incorrect Correct answer

The rate of the slow reaction increases by

the addition of a catalyst

Correct Incorrect Correct answer

increasing activation energy

Correct Incorrect Correct answer

increasing concentration

Correct Incorrect Correct answer

Both (A+C) are correct

Correct Incorrect Correct answer

In the following reaction :( BFe_3(aq)+F^–_(aq)→BF₄^–_(aq) ) which of the following is Lewis base

-F

Correct Incorrect Correct answer

‌BF₃

Correct Incorrect Correct answer

‌BF₃^–

Correct Incorrect Correct answer

هیچیان

Correct Incorrect Correct answer

the spectator ion in the following reaction

Al_(S)+H₂SO_{4(aq) →}

‌SO₄^-2

Correct Incorrect Correct answer

‌Al⁺³

Correct Incorrect Correct answer

‌H₃O⁺

Correct Incorrect Correct answer

all of them are correct

Correct Incorrect Correct answer

Which one of the following statements is incorrect

Many solids dissolve more quickly in a cold solvent than in warm solvent

Correct Incorrect Correct answer

Gases are generally more soluble in water at low temperature

Correct Incorrect Correct answer

Aqueous solution is a mixture containing the solute soluble in water as a solvent

Correct Incorrect Correct answer

The effect of stirring is similar to that of crushing a solid – contact between the solvent and the solute surface is increased

Correct Incorrect Correct answer

All of the following statements are true about the collision theory except

all collisions between particles of reactant leads to the occurrence of the chemical reaction

Correct Incorrect Correct answer

the reaction rate is directly proportional with the number of effective collision

Correct Incorrect Correct answer

in order for chemical reaction to occur, the reacting particles must collide

Correct Incorrect Correct answer

the particles of reactants must have enough energy to initiate the reaction

Correct Incorrect Correct answer

The strength of an acid does not depend on

The polarity of the bond between hydrogen and the element it is bonded

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the bond energy

Correct Incorrect Correct answer

the number of hydrogen atoms in the chemical acid formula

Correct Incorrect Correct answer

both (A+B) are correct

Correct Incorrect Correct answer

A reaction has ∆H=-74.8kJ/mol , ∆S=-0.081kJ/mol.K at 27^oC which of the following is correct

ΔG=50.5KJ nonspontaneous

Correct Incorrect Correct answer

ΔG=-72.8KJ spontaneous

Correct Incorrect Correct answer

ΔG=72.8KJ nonspontaneous

Correct Incorrect Correct answer

ΔG=-50.5KJ spontaneous

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The boiling point of a solution is higher than that of a pure solvent because

Vapor-pressure lowering

Correct Incorrect Correct answer

Freezing- point heightening

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Vapor-pressure heightening

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none of them

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The rate law of the following reaction: A+2B→2AB₂,is R=K[B]² , what happens to the reaction rate when the
concentration of both reactants is doubled

the reaction rate remains the same.

Correct Incorrect Correct answer

the reaction rate increases by a factor of two

Correct Incorrect Correct answer

the reaction rate increases by a factor of fou

Correct Incorrect Correct answer

the reaction rate increases by a factor eight

Correct Incorrect Correct answer

The concentration of H3O+ ions in aqueous solution of Ba(OH)₂ is1x10^-11M,

? what is the molar concentration of solution

‌1×10^-3M

Correct Incorrect Correct answer

‌2×10^-4M

Correct Incorrect Correct answer

‌2×10^-3M

Correct Incorrect Correct answer

‌5×10^-4M

Correct Incorrect Correct answer

A substance that can react as an acid or a base

‌SO₄^-2

Correct Incorrect Correct answer

‌HSO₃^–

Correct Incorrect Correct answer

‌CH₃COO^–

Correct Incorrect Correct answer

‌NH₄⁺

Correct Incorrect Correct answer

A proposed mechanism for the reaction is

2NO+H₂→N₂O+H₂O :slow

N2O+H₂→N₂+H₂O : fast

? which of the following is correct

R=K[NO][H₂]

Correct Incorrect Correct answer

2NO+H₂→N₂O+2H₂O :

overall balanced equation for the reaction is

Correct Incorrect Correct answer

the reaction order is second

Correct Incorrect Correct answer

Both (A+C) are correct

Correct Incorrect Correct answer

How much energy would be absorbed as heat by 75g of iron when heated from 295K to 301K if its specific heat
is 0.449J/g.K

202KJ

Correct Incorrect Correct answer

27.83J

Correct Incorrect Correct answer

1002J

Correct Incorrect Correct answer

202J

Correct Incorrect Correct answer

? Which of the following solutions with the same concentrations has lower [⁺H₃O]

HCl

Correct Incorrect Correct answer

‌H₂O

Correct Incorrect Correct answer

‌NH₃

Correct Incorrect Correct answer

HF

Correct Incorrect Correct answer

The energy required to raise the reactant to the level of the activated complex is

Activation energy

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Free energy

Correct Incorrect Correct answer

Kinetic energy

Correct Incorrect Correct answer

. Energy of reaction

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The enthalpy change that occurs during the complete combustion of one mole of an element or compound is
called

Enthalpy of formation

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Enthalpy of solution

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Enthalpy of combustion

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Specific Heat

Correct Incorrect Correct answer

In the following an exothermic gaseous reaction :( 2CO+O₂→2CO₂ ) , which of the following statements is true
about the reaction

The reaction is always spontaneous

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The reaction is never spontaneous.

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The reaction is spontaneous at low temperature

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The reaction is spontaneous at high temperature

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A substance that formed when a strong acid has lost a proton

strong conjugate base

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weak conjugate acid

Correct Incorrect Correct answer

weak conjugate base

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cations

Correct Incorrect Correct answer

Which of the following represents the formation equation

N₂+O₂→2NO

Correct Incorrect Correct answer

C_{(گرافیت)}+O₂→CO₂

Correct Incorrect Correct answer

CO+¹/₂O₂→CO₂

Correct Incorrect Correct answer

CO₂→C_{(گرافیت)}+O₂

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In the following hypothetical reaction :(A₂+B₂→2AB+30KJ), the activation energy for the forward reaction equal
50kJ/mol ,the activation energy for reverse reaction is equal to

20KJ/mol

Correct Incorrect Correct answer

80KJ/mol

Correct Incorrect Correct answer

80KJ/mol-

Correct Incorrect Correct answer

10KJ/mol

Correct Incorrect Correct answer

Calculate the moles of NaOH if 100 mL of its solution neutralized with 200 mL of 0.01M HB

0.01M

Correct Incorrect Correct answer

0.002M

Correct Incorrect Correct answer

0.001M

Correct Incorrect Correct answer

0.02M

Correct Incorrect Correct answer

The entropy increases at

evaporating of liquid

Correct Incorrect Correct answer

temperature raising

Correct Incorrect Correct answer

increase pressure

Correct Incorrect Correct answer

. both(A+B) are correct

Correct Incorrect Correct answer

In the following reaction :( 2HCl_(g)+184.6KJ→H_2(g)+Cl_2(g) ), the standard formation enthalpy of HCl equals

184.6KJ/mol

Correct Incorrect Correct answer

184.6KJ/mol-

Correct Incorrect Correct answer

92.3KJ/mol-

Correct Incorrect Correct answer

92.3KJ/mol

Correct Incorrect Correct answer

For an exothermic dissolution process, the increasing of the temperature causes

. increasing dissolution

Correct Incorrect Correct answer

decreasing dissolution

Correct Incorrect Correct answer

decreasing crystallization

Correct Incorrect Correct answer

Both (A+C) are correct

Correct Incorrect Correct answer

The value of equilibrium constant for this gaseous reaction :(N₂O₄ ⇒2NO₂) is 0.1 at a specified temperature,
what would be the value of that constant for the reverse reaction at the same condition

0.05

Correct Incorrect Correct answer

0.1

Correct Incorrect Correct answer

10

Correct Incorrect Correct answer

5

Correct Incorrect Correct answer

Adding NH₄Cl to NH₃ solution leads to

[ NH₃]

decrease

Correct Incorrect Correct answer

[ OH^–]

increase

Correct Incorrect Correct answer

[

NH₃

] increase ionization of

Correct Incorrect Correct answer

H₃O⁺

increase

Correct Incorrect Correct answer

In equilibrium gaseous reaction: 2NO+Cl₂ 2NOCl +energy, which of the following shift the reaction to the
right

adding catalyst

Correct Incorrect Correct answer

decreasing system volume

Correct Incorrect Correct answer

increasing temperature

Correct Incorrect Correct answer

decreasing pressure

Correct Incorrect Correct answer

In the following gaseous reaction:( N₂+3H₂↔2NH₃) it was found the [NH3]=0.62 M ,[H2]=0.14 M, [N2]=0.45 M
the value of the equilibrium constant equals:

3.2×10^-3M

Correct Incorrect Correct answer

3.11×10²M

Correct Incorrect Correct answer

3.11×10^-2M

Correct Incorrect Correct answer

9.84

Correct Incorrect Correct answer

How many moles of ammonium sulfate must be dissociate to produce 0.4 mol of sulfate ion

0.2mol

Correct Incorrect Correct answer

0.4mol

Correct Incorrect Correct answer

0.6mol

Correct Incorrect Correct answer

0.8mol

Correct Incorrect Correct answer

Unknown liquid miscible with toluene and immiscible with water which of the following statements is correct

an aqueous solution for the liquid conducts electric current

Correct Incorrect Correct answer

a liquid is nonpolar molecular compound.

Correct Incorrect Correct answer

a liquid is polar molecular compound

Correct Incorrect Correct answer

none of them

Correct Incorrect Correct answer

The solubility product of cadmium carbonate, CdCO₃ , is 1.0×10^-12 .In a saturated solution of this salt, the
concentration of carbonate ions is

5×10^-13M

Correct Incorrect Correct answer

3×10^-6M

Correct Incorrect Correct answer

1×10^-6M

Correct Incorrect Correct answer

5×10^-7M

Correct Incorrect Correct answer

The net ionic equation for the precipitation Nickel ( II )sulfide is

NiS_(S)→Ni⁺²_(aq)+S^-2_(aq)

Correct Incorrect Correct answer

2Ni⁺²_(aq)+2S^-2_(aq)→Ni₂S_2(S)

Correct Incorrect Correct answer

Ni⁺²_(aq)+S^-2_(aq)→NiS_(S)

Correct Incorrect Correct answer

it does not have precipitate equation because it is soluble in water

Correct Incorrect Correct answer

All of them are correct except

An ionic compound at solid state does not conduct electric current

Correct Incorrect Correct answer

Alloy is a mixture the atoms of two or more metals are uniformly mixed

Correct Incorrect Correct answer

The Brownian motion is a motion due to collision rapidly moving molecules

Correct Incorrect Correct answer

HCl does not soluble in water

Correct Incorrect Correct answer

In aqueous solution contains, Ca⁺²,SO₄^-2 ions, CaSO₄ precipitates if

Ksp=[Ca⁺²][SO₄^-2]

Correct Incorrect Correct answer

Ksp<[Ca⁺²][SO₄^-2]

Correct Incorrect Correct answer

Ksp>[Ca⁺²][SO₄^-2]

Correct Incorrect Correct answer

can not be determined

Correct Incorrect Correct answer

When barium chloride solution is mixed with sodium nitrate

sodium chloride precipitates

Correct Incorrect Correct answer

barium nitrate precipitates

Correct Incorrect Correct answer

precipitation does not occur

Correct Incorrect Correct answer

Both ( A + B ) are correct

Correct Incorrect Correct answer

The boiling-point elevation of a solvent is 2.4oC, when the concentration of the solution containing a
nonelectrolyte solute is 3.1m, what is the value of molal boiling-point constant

1.29C/m

Correct Incorrect Correct answer

0.77C/m-

Correct Incorrect Correct answer

7.44C/m

Correct Incorrect Correct answer

0.77C/m

Correct Incorrect Correct answer

Which of the following ions hydrolyze in aqueous solution

‌NO₃^–

Correct Incorrect Correct answer

‌CO₃^-2

Correct Incorrect Correct answer

‌SO₄^-2

Correct Incorrect Correct answer

none of them is correct

Correct Incorrect Correct answer

Aqueous solution of NH3 is an Arrhenius base because

it is proton accepter

Correct Incorrect Correct answer

it increases the concentration of hydronium ion

Correct Incorrect Correct answer

it is an electron pair donor

Correct Incorrect Correct answer

.it increases the concentration of hydroxide ion

Correct Incorrect Correct answer

The following reaction :(2A+B→A₂B ) is occur by one step mechanism the rate law for the reaction is

R=K[A][B]

Correct Incorrect Correct answer

R=K[A₂B]

Correct Incorrect Correct answer

R=K[A]²[B]

Correct Incorrect Correct answer

R=K[A][B]²

Correct Incorrect Correct answer

The common-ion causes

increasing precipitation.

Correct Incorrect Correct answer

decreasing ionization

Correct Incorrect Correct answer

shifting equilibrium to left

Correct Incorrect Correct answer

all of them are correct

Correct Incorrect Correct answer

While mixing a small quantity of water with a large quantity of ethanol, water considered as

solvent

Correct Incorrect Correct answer

solute

Correct Incorrect Correct answer

solution

Correct Incorrect Correct answer

none of them

Correct Incorrect Correct answer

When polar compound ionizes completely in water the compound is

ionic electrolyte

Correct Incorrect Correct answer

weak electrolyte

Correct Incorrect Correct answer

non-electrolyte molecular

Correct Incorrect Correct answer

strong molecular electrolyte

Correct Incorrect Correct answer

? Which of the following is homogenous mixture

milk

Correct Incorrect Correct answer

24-karat gold

Correct Incorrect Correct answer

tap water

Correct Incorrect Correct answer

oil and water

Correct Incorrect Correct answer

:The methyl orange is used to determine the equivalence point in one of the following titration

If the pH range for transition interval is (3.1- 4.4)

‌NH₃ , HCl

Correct Incorrect Correct answer

‌CH₃COOH ,NaOH

Correct Incorrect Correct answer

‌HNO₃ ,NaOH

Correct Incorrect Correct answer

‌NH₃ , CH₃COOH

Correct Incorrect Correct answer

The dilute aqueous solution of a weak acid contains

hydronium ions

Correct Incorrect Correct answer

acid molecules

Correct Incorrect Correct answer

anions

Correct Incorrect Correct answer

all of them are correct

Correct Incorrect Correct answer

?Which of the following is a binary acid

‌H₂S

Correct Incorrect Correct answer

‌H₂CO₃

Correct Incorrect Correct answer

‌H₂O₂

Correct Incorrect Correct answer

all of them are correct

Correct Incorrect Correct answer

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