پرسیاری وزاری کیمیا 2022-2023 خولی دووەم ، خوێندنی ئینگلیزی

Which of the following statements is correct about an aqueous solutions of KCl and sucrose, with
same concentration

both solutions have the same vapor pressure

Correct Incorrect Correct answer

sucrose solution would boil at a lower temperature

Correct Incorrect Correct answer

KCl solution would freeze at higher temperature

Correct Incorrect Correct answer

both solutions would boil at the same temperature

Correct Incorrect Correct answer

This reaction

2NO₂(g)→N₂O₄(g)+ energy , is spontaneous at

equilibrium

Correct Incorrect Correct answer

all temperatures

Correct Incorrect Correct answer

lower temperatures

Correct Incorrect Correct answer

higher temperatures

Correct Incorrect Correct answer

In one of the following reactions a substance acts as both an oxidizing agent and reducing
agent at the same time

‌HCl+HOCl→Cl₂+H₂O

Correct Incorrect Correct answer

‌Cr₂O₇^-2→CrO₄^-2+Cr₂O₃

Correct Incorrect Correct answer

‌3FeO→Fe₂O₃+Fe

Correct Incorrect Correct answer

All of them

Correct Incorrect Correct answer

By dissolving aluminum sulfate in water, 0.3 moles of aluminum ions are produced, how many
moles of sulfate ions are produced

0.6

Correct Incorrect Correct answer

0.15

Correct Incorrect Correct answer

0.75

Correct Incorrect Correct answer

0.45

Correct Incorrect Correct answer

A reaction has ∆H0=206.1kJ/mol and ∆S0=0.215kJ/(mol.K) at room temperature, which of the
following is correct

Correct Incorrect Correct answer

The ions in voltaic cells is transferred by

جەەسەری‏ ئانۆد

Correct Incorrect Correct answer

cathode electrode

Correct Incorrect Correct answer

connecting wire

Correct Incorrect Correct answer

salt bridge

Correct Incorrect Correct answer

Which of the following solutions would contain the lowest concentration of hydronium
ions(⁺H₃O)

HCl

Correct Incorrect Correct answer

‌CH₃COOH

Correct Incorrect Correct answer

‌KNO₃

Correct Incorrect Correct answer

‌NH₄Cl

Correct Incorrect Correct answer

Is a type of energy transferred spontaneously from a matter at higher temperature to a matter
at lower temperatur

specific heat

Correct Incorrect Correct answer

temperature

Correct Incorrect Correct answer

enthalpy of formation

Correct Incorrect Correct answer

heat

Correct Incorrect Correct answer

Which metal would best provide cathodic protection from corrosion for an iron bridge? IfE0reduce for ( Fe²⁺,Mg²⁺, Sn²⁺, Cu²+, Al³⁺) respectively is (-0.41, -2.37, -0.14, 0.34 ,-1,66) volt

Mg

Correct Incorrect Correct answer

Al

Correct Incorrect Correct answer

Sn

Correct Incorrect Correct answer

Cu

Correct Incorrect Correct answer

The chemical formula of chlorite is

‌Cl^–

Correct Incorrect Correct answer

‌ClO₂^–

Correct Incorrect Correct answer

‌ClO^–

Correct Incorrect Correct answer

‌ClO₃^–

Correct Incorrect Correct answer

. The slowest step in a reaction mechanism is called

the uncatalyzed reaction

Correct Incorrect Correct answer

the activation step

Correct Incorrect Correct answer

the rate-determining step

Correct Incorrect Correct answer

none of them

Correct Incorrect Correct answer

When silver is electroplated onto another metal, Ag is

. oxidized at the anode

Correct Incorrect Correct answer

reduced at the cathode

Correct Incorrect Correct answer

reduced at the anode

Correct Incorrect Correct answer

oxidized at the cathode

Correct Incorrect Correct answer

One of the following compounds is not Bronsted-Lowry acid

‌H₂O

Correct Incorrect Correct answer

‌NH₄⁺

Correct Incorrect Correct answer

HlO

Correct Incorrect Correct answer

‌BF₃

Correct Incorrect Correct answer

One of the following does not change by changing temperature

specific rate constant

Correct Incorrect Correct answer

number of effective collision

Correct Incorrect Correct answer

rate of reaction

Correct Incorrect Correct answer

activation energy

Correct Incorrect Correct answer

Ore bauxite is used to produce……………by electrolysis

Nickel

Correct Incorrect Correct answer

iron

Correct Incorrect Correct answer

copper

Correct Incorrect Correct answer

aluminum

Correct Incorrect Correct answer

Is an acid used in the manufacture of detergents and ceramics

‌H₃PO₄

Correct Incorrect Correct answer

HCl

Correct Incorrect Correct answer

‌CH₃COOH

Correct Incorrect Correct answer

‌HNO₃

Correct Incorrect Correct answer

This reaction: A+2B→ C , is second order, found when [B] was doubled, the reaction rate
doubled, which of the following is correct

R=K[A][B]

Correct Incorrect Correct answer

the reaction occur in the one-step mechanism

Correct Incorrect Correct answer

‌R=K[B]²

Correct Incorrect Correct answer

both (A and B) are correct

Correct Incorrect Correct answer

Which of the following types of molecular representations can be used to show differences
between isomers

molecular formula

Correct Incorrect Correct answer

empirical formula

Correct Incorrect Correct answer

structural formula

Correct Incorrect Correct answer

both (A and C)

Correct Incorrect Correct answer

If [Mg²⁺]³[PO4^3-]²<Ksp

the net ionic equation for neutralization reaction of H₃PO₄ and Mg(OH)₂is

Correct Incorrect Correct answer

In the following reaction: 2NO₂→2NO+O₂ , the first step reaction is: (NO₂→NO+O), which
of the following is a second step reaction

‌NO₂+O→NO₃

Correct Incorrect Correct answer

‌NO₂+O→NO+O₂

Correct Incorrect Correct answer

‌2NO+O→N₂O₃

Correct Incorrect Correct answer

‌NO₂+O₂→N+2O2

Correct Incorrect Correct answer

For this reaction :
2Li⁺+Zn→2Li+Zn⁺²

which of the following is correct

E^o_reduce Li⁺=-3.04V , E^o_reduce Zn⁺²=-0.76V

Ecell =+2.28V , spontaneous

Correct Incorrect Correct answer

Ecell=-2.28V ,spontaneous

Correct Incorrect Correct answer

Ecell=+3.80V , spontaneous

Correct Incorrect Correct answer

Ecell=-3.80V ,nonspontaneous

Correct Incorrect Correct answer

:An aqueous solution of sulfuric acid contains all of them except

‌H₃O⁺

Correct Incorrect Correct answer

‌H₂SO₄

Correct Incorrect Correct answer

‌SO₄^-2

Correct Incorrect Correct answer

‌HSO₄^–

Correct Incorrect Correct answer

?In which of the following equilibrium systems the concentration of products is highest

Correct Incorrect Correct answer

cannot determined

Correct Incorrect Correct answer

The correct name for the following compound

‏

according IUPAC system is

2-fluoro-3-bromo butane

Correct Incorrect Correct answer

3-fluoro-2-bromo butane

Correct Incorrect Correct answer

2,3-bromofluoro butane

Correct Incorrect Correct answer

2-bromo-3-fluoro butane

Correct Incorrect Correct answer

The required mass of Ca(OH)₂ in 500mL of its solution to make pH equal to 13 is (molar mass=74g/mol)

1.85g

Correct Incorrect Correct answer

3.7g

Correct Incorrect Correct answer

7.4g

Correct Incorrect Correct answer

0.925g

Correct Incorrect Correct answer

Is a salt when dissolved in water increases hydroxide ion concentration

KCN

Correct Incorrect Correct answer

‌NaNO₃

Correct Incorrect Correct answer

‌NH₄Cl

Correct Incorrect Correct answer

None

Correct Incorrect Correct answer

A compound C₇H₁₂is called

octene

Correct Incorrect Correct answer

octyne

Correct Incorrect Correct answer

heptene

Correct Incorrect Correct answer

heptyne

Correct Incorrect Correct answer

?Which of the following solutions is an acid at 25oC

PH=12

Correct Incorrect Correct answer

PoH=3.5

Correct Incorrect Correct answer

‌1.0×10^-7M=[H3O⁺]

Correct Incorrect Correct answer

‌[OH^–]=1.0×10^-12M

Correct Incorrect Correct answer

The concentration of fluoride ions in a saturated solution of CaF₂ is 2.2×10^-3mol/L , the K_SP value equal:

‌1.1×10^-3

Correct Incorrect Correct answer

‌1.3×10^-9

Correct Incorrect Correct answer

‌5.3×10^-9

Correct Incorrect Correct answer

‌4.2×10^-8

Correct Incorrect Correct answer

Which of the following properties for diamond is incorrect

good heat conductor

Correct Incorrect Correct answer

good electrical conductor

Correct Incorrect Correct answer

it has high density

Correct Incorrect Correct answer

it has extremely high melting point

Correct Incorrect Correct answer

?By heating 500mL of pure water to 50oC which of the following relationships is correct

Correct Incorrect Correct answer

The following gaseous reaction: ( 2SO₂+O₂⇔2SO₃+198kj ), reached equilibrium at 600^oC ,at which of the following temperature the value of equilibrium constant (K) is highest

‌700^oC

Correct Incorrect Correct answer

‌500^oC

Correct Incorrect Correct answer

‌300^oC

Correct Incorrect Correct answer

‌400^oC

Correct Incorrect Correct answer

The name of this compound

according IUPAC system is

2-methyl-2,3-pentadien

Correct Incorrect Correct answer

2-methyl-2,4-pentadien

Correct Incorrect Correct answer

4-methyl -1,3-pentadien

Correct Incorrect Correct answer

4-methyl-1,3-butadien

Correct Incorrect Correct answer

. In the reaction between dilute sulfuric acid and barium metal produce……….and hydrogen gas

barium sulfide

Correct Incorrect Correct answer

barium sulfite

Correct Incorrect Correct answer

barium sulfate

Correct Incorrect Correct answer

‌Ba₂SO₄

Correct Incorrect Correct answer

Which of the following reactions the equilibrium shifts to left direct by decreasing
system volume

Correct Incorrect Correct answer

Which of the following hydrocarbons is less chemically reactive

benzene

Correct Incorrect Correct answer

alkene

Correct Incorrect Correct answer

alkyne

Correct Incorrect Correct answer

cannot determined

Correct Incorrect Correct answer

By titration 17.6mL of diprotic acid solution neutralized 27.4mL of 0.0165 M KOH solution, the
molarity of acid is

0.0257M

Correct Incorrect Correct answer

0.0128M

Correct Incorrect Correct answer

3.8M

Correct Incorrect Correct answer

0.128M

Correct Incorrect Correct answer

All of the following solutions can resist changes in pH by addition a small amount of an acid or
base except:

RbClO⁴,HClO⁴

Correct Incorrect Correct answer

NH⁴,NO³

Correct Incorrect Correct answer

NaNO²,HNO²

Correct Incorrect Correct answer

KCN,HCN

Correct Incorrect Correct answer

The type of this organic reaction

‏

addition

Correct Incorrect Correct answer

condensation

Correct Incorrect Correct answer

elimination

Correct Incorrect Correct answer

substitution

Correct Incorrect Correct answer

In the following reaction: A₂B+80kJ →2A+B , Eaʻ= 20kJ/mol and the reactants’
energy is -20kJ/mol , the activated complex energy is equal

100kj/mol

Correct Incorrect Correct answer

60kj/mol

Correct Incorrect Correct answer

80kj/mol

Correct Incorrect Correct answer

120kj/mol

Correct Incorrect Correct answer

In this reaction

one of the following is oxidized

H

Correct Incorrect Correct answer

O

Correct Incorrect Correct answer

Ca

Correct Incorrect Correct answer

None

Correct Incorrect Correct answer

Are organic compounds in which the carbonyl group is attached to carbon atoms within the
chain

ketones

Correct Incorrect Correct answer

aldehydes

Correct Incorrect Correct answer

carboxylic acids

Correct Incorrect Correct answer

esters

Correct Incorrect Correct answer

One of the following salts is insoluble in water

SrS

Correct Incorrect Correct answer

‌Mg(ClO₃)₂

Correct Incorrect Correct answer

CdS

Correct Incorrect Correct answer

‌CaCl₂

Correct Incorrect Correct answer

If 3.5kJ of energy are added to a 28.15g sample of iron at 20oC, the final temperature of the
iron in kelvins is: (c_p=0.449J/(g.K))

227

Correct Incorrect Correct answer

570

Correct Incorrect Correct answer

297

Correct Incorrect Correct answer

470

Correct Incorrect Correct answer

After balancing the following half-reaction

: (MnO₂→Mn₂O₃) in basic solution, Mn

two electrons are gained

Correct Incorrect Correct answer

one electron is gained

Correct Incorrect Correct answer

two electrons are lost

Correct Incorrect Correct answer

one electron is lost

Correct Incorrect Correct answer

Is a poisonous alcohol is used as octane enhancers in fuel and as alternative fuels

methanol

Correct Incorrect Correct answer

glycerol

Correct Incorrect Correct answer

ethanol

Correct Incorrect Correct answer

propanol

Correct Incorrect Correct answer

? The molal concentration of an aqueous CaCl2 solution that freezes at -2.43^oC is

(K_f = -1.86^oC/m)

0.435m

Correct Incorrect Correct answer

0.653m

Correct Incorrect Correct answer

1.306m

Correct Incorrect Correct answer

2.29m

Correct Incorrect Correct answer

The standard enthalpy of formation for each of CO₂(g),H₂O(l) and C₅H₁₂ respectively is
(-394,-286,-147)kJ/mol, the enthalpy of combustion of pentane is

107kj/mol-

Correct Incorrect Correct answer

3539kj/mol-

Correct Incorrect Correct answer

3539kj/mol

Correct Incorrect Correct answer

107kj/mol

Correct Incorrect Correct answer

? In which of the following compounds the oxidation number of xenon is highest

‌XeO₃

Correct Incorrect Correct answer

‌XeF₂

Correct Incorrect Correct answer

‌XeOF₂

Correct Incorrect Correct answer

‌CsXeF₈

Correct Incorrect Correct answer

In many organic reactions ,an ether is used as a solvent instead of

alcohol

Correct Incorrect Correct answer

water

Correct Incorrect Correct answer

benzene

Correct Incorrect Correct answer

alkane

Correct Incorrect Correct answer

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