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Chemistry work sheet

Total questions: 82

Worksheet time: 51mins

Name
Class
Date
1.

Which one of the following atomic models was developed with a preposition that electrons can be described only in terms of the probability of their location?

a)

Rutherford model

b)

Quantum mechanical model

c)

Dalton's model

d)

Bohr model

2.

Which of the following is correct decreasing order of atomic size for the elements Al, Ar, Na, Si( Z= 13, 18, 11, 14, respectively)?

a)

Si, Na, Al, Ar

b)

Na, Al, Si, Ar

c)

Ar, Si, Al, Na

d)

Al, Si, Ar, Na

3.

In the Lewis formula for PCl3, phosphorous is surrounded by ________ bonding and________non-bonding electron pairs respectively.

a)

9, 3

b)

1, 3

c)

3, 1

d)

3, 9

4.

Which of the following factors affects rates of a chemical reaction?

a)

Temperature

b)

Concentration

c)

Surface area

d)

All

5.

Which one of the following is a decomposition reaction?

a)

AgNO3 + NaCl -> AgCl + NaNO3

b)

Zn + 2HCl -> ZnCl2 + H2

c)

2H2 + O2 -> 2H2O

d)

2Hg O -> 2Hg + O2

6.

In the following chemical reaction, which substance is a reducing agent? HNO3 + SO2 + H2O -> H2SO4 + NO

a)

SO2

b)

NO

c)

HNO3

d)

H2O

7.

Gas X diffuses twice as fast as gas Y. Gas Y has a molecular weight of 60g/mol. What is the molar mass of gas X?

a)

12g/mol

b)

15g/mol

c)

30g/mol

d)

90g/mol

8.

Vaporization of solids without melting is known as ____________.

a)

Fusion

b)

Sublimation

c)

Condensation

d)

Boiling

9.

From the following identify the correct statement about hydrocarbons. They are: ___________

a)

Hydrated carbons

b)

Also called carbohydrates

c)

Compounds containing hydroxyl group

d)

Compounds containing hydrogen and carbon

10.

What is the IUPAC name of the following organic molecule?

4 lines
11.

What is the molecular formula of open chain alkane with 14 carbon atoms?

a)

C14H12

b)

C14H16

c)

C14H30

d)

C14H28

12.

From the following given structures which one represents aromatic hydrocarbon?

4 lines
13.

Which one of the following alkanes is the largest constituent of natural gases?

a)

Propane

b)

Ethane

c)

Butane

d)

Methane

14.

A substance that added to soil to increase the fertility of soil is:_________

a)

Fertilizers

b)

Pesticides

c)

Herbicides

d)

Weed killers

15.

The term that is used to describe chemicals that are mainly obtained from the Earth and are NOT associated with living things is known as _______

a)

Organic

b)

Inorganic

c)

Homologous

d)

Isomer

16.

Amphoteric oxides __________

a)

Have both acidic and basic properties

b)

Are all non-metallic oxides

c)

Have neither acidic nor basic properties

d)

Can be represented by CuO, FeO, Fe2O3

17.

Which of the following is NOT a macronutrient for plants?

a)

Magnesium

b)

Iron

c)

Potassium

d)

Phosphorous

18.

Which of the following substances will release hydrogen gas when it reacts with hydrochloric acid (HCl)?

a)

Zn

b)

NaOH

c)

H2SO4

d)

CaO

19.

Which one of the following substances conducts electricity du

4 lines
20.

Which one of the following substances conducts electricity due to the presence of free electrons?

a)

Molten sodium chloride

b)

Nitric acid solution

c)

Hydrochloric acid solution

d)

Copper metal

21.

Which one of the following statement is NOT true based on the given reaction?

a)

The anode of this cell is made of lead metal |Pb|.

b)

The cathode of this cell is made of lead (IV) oxide| PbO2|.

c)

About 35% of H2SO4 is used as electrolyte in this cell.

d)

SO42- ions are produced at both electrodes.

22.

Which of the following natural resources is non-renewable?

a)

Plants

b)

Animals

c)

Petroleum

d)

Water

23.

Which property of aluminium makes it preferably best for the construction of airplanes framework?

a)

Its good electrical conductivity

b)

Its high ductility

c)

Its resistance to corrosion

d)

Its lightness and strength

24.

The following are characteristic of chemical industries except one. Which one is it?

a)

They consume relatively small amount of energy

b)

They use naturally available raw materials

c)

They do not have any negative impact on environment

d)

They involve chemical reactions in their production of materials.

25.

Which one of the following does not increase carbon dioxide in the atmosphere?

a)

Photosynthesis

b)

Respiration

c)

Burning of fuels

d)

Burning of carbon

26.

Which of the following branch of chemistry is usually concerned with quality control in such fields as foods, pharmaceuticals and safe water?

a)

Physical chemistry

b)

Analytical chemistry

c)

Biochemistry

d)

In organic chemistry

27.

From the given Scientific methods, which one comes first?

a)

Theory

b)

Observation

c)

Law

d)

Testing

28.

All cathode rays are the same regardless of the nature of electrode material, residual gas and conductive wire used in cathode ray tube. This observation shows that:

a)

Cathode rays travel in straight line.

b)

Cathode rays are material particles.

c)

Electrons are fundamental particles.

d)

Cathode rays are negatively charged particles.

29.

Which of the following atomic number can be represented by the electronic configuration 1s22s22p63s23p64s1?

a)

12

b)

26

c)

19

d)

17

30.

The maximum number of electrons in an orbital of an atom possessing a quantum number n= 4, l = 3, and ml = 0 is: ___________

a)

14

b)

2

c)

32

d)

8

31.

The correct electronic configuration for Copper (Cu, Z= 29) is ________

a)

1s22s22p63s23p63d44d7

b)

1s22s22p63s23p64s13d10

c)

1s22s22p63s23p64s03d10

d)

1s22s22p63s23p64s23d9

32.

Which of the following substances has the largest lattice energy?

a)

LiF

b)

KF

c)

NaF

d)

CsF

33.

The central atom of one of the following compound does not obey the octet rule. Which one is it?

a)

NH4+

b)

SO3

c)

AlCl3

d)

H2O

34.

What is the hybridization of carbon in Cl2CO having the following structure?

4 lines
35.

How many sigma (σ) and pi (π) bonds are there in acetone, CH3COCH3?

a)

6 σ and 2 π

b)

9 σ and 1 π

c)

6 σ and 3 π

d)

7 σ and 2 π

36.

The reaction in A and B is third order in A and zero order in B. What change occurs in the rate of the reaction if the concentration of each reactant is doubled?

a)

Remain unchanged

b)

4-fold increases

c)

6-fold increases

d)

8- fold increases

37.

For the reaction N2(g) + O2(g) ⇌ 2NO(g); Kc = 1.0 × 10-4 at 1200℃ . What is the equilibrium concentration of NO in a vessel that contains 0.8molLN2 and 0.2molL O2?

a)

1.6 × 10-2 M

b)

2.5 × 10-4 M

38.

What is the equilibrium concentration of NO in a vessel that contains 0.8molLN2 and 0.2molL O2?

a)

1.6 × 10-2 M

b)

2.5 × 10-4 M

c)

4.0 × 10-3 M

d)

0.40 M

39.

The statement "If a system at equilibrium is subjected to a stress, the system will readjust itself to reduce the effects of the stress is known as _______

a)

Faradays law

b)

Avogadro's principle

c)

Boyle's law

d)

Le-chatelier's principle

40.

Given a general reaction at equilibrium: aA+bB⇌mM+nN; the equilibrium constant Kc is ___

a)

Kc=MmNn-AaBb

b)

Kc=AaBbMmNn

c)

Kc= MmNnAaBb

d)

Kc= AaBb-[M]m[N]n

41.

The acid which found in ants (i.e. responsible the painful feeling from the "sting of ants" is: ________

a)

Lactic acid

b)

Acetic acid

c)

Formic acid

d)

Propanoic acid

42.

The name of reaction made between organic acid and alcohol is known as:______

a)

Saponification

b)

Hydrogenation

c)

Esterification

d)

Hydrolysis

43.

For the step wise dissociation of aqueous H3PO4 which of the following is NOT a conjugate acid- base pair?

a)

H3PO4/H2PO4-

b)

H2PO4-/HPO4-2

c)

HPO4 -2/PO4-3

d)

H2PO4-2/PO4-3

44.

A Bronsted-Lowry acid is

a)

Release hydronium ions in water

b)

A proton acceptor

c)

An electron pair acceptor

d)

A proton donor

45.

Given the reaction: HC2O4- + NH3 NH4+ + C2O4-2 Which of the following represents a conjugate acid - base pair?

a)

HC2O4 - / NH4+

b)

NH3 / C2O4-2

c)

HC2O4- / C2O4-2

d)

NH3 / NH4+

46.

Which of the following is Not a Bronsted- Lowry acid and a bronsted-Lowry base?

a)

HS-

b)

HSO4-

c)

OH-

d)

NH4+

47.

If a solution of acetic acid [CH3COOH] has a PH of 3.00. What is it's concentration? ( Ka = 1.8x10-5)

a)

0.0057M

b)

0.057M

c)

0.57M

d)

5.70M

48.

What is the PH and [H+] of a 0.2M solution of HCN? (Ka = 4.9x10-10)

a)

PH =3 , [H+]= 4.9x10-6M

b)

PH =5 , [H+]= 9.9x10-6M

c)

PH =3 , [H+]= 4.9x10-6M

d)

PH =5 , [H+]= 4.9x10-10M

49.

What is the PH of a 0.0005M Ca(OH)2? (Assuming the base is completely ionized)

a)

3

b)

11

c)

10

d)

9

50.

What is the % ionization of a 0.5M CH3COOH? (Ka=1.8x10-5)

a)

6%

b)

3%

c)

0.6%

d)

2.5%

51.

A 0.25M solution of a weak acid HA is 3% ionized at 25oC. What is the Ka value?

a)

0.00075(0.00075)0.2425

b)

(0.001 )(0.001)0.249

c)

0.0075( 0.0075)0.2425

d)

0.01( 0.01)0.24

52.

What is the percentage of ions that are protonated in 0.2M NaCN (aq) at 25oC? ( Ka = 4.9x10-10)

a)

1%

b)

2%

c)

3.5%

d)

0 .5%

53.

Which one of the following is TRUE about common-ion effect?

a)

It suppresses the ionization of weak acids or bases.

b)

It decreases the concentration of weak acids or bases.

c)

It increases the concentration of hydrogen ions in acids.

d)

All of the above

54.

For preparing a buffer of PH =6 by mixing sodium acetate and acetic acid, what would be the ratio of the concentration of a salt and acid? ( Ka = 10-5)

a)

10:1

b)

1:10

c)

100:1

d)

1:100

55.

Which one of the following pairs can NOT be mixed together to form a buffer solution?

a)

NH3/NH4Cl

b)

CH3COOH/CH3COONa

c)

NaOH/H2SO4

d)

HCN/KCN

56.

What is the PH of a solution that is 0.15M in NH3 solution and 0.075M in(NH4)2SO4 solution? ( PKb = 4.74 )

a)

4.74

b)

8.57

c)

9.26

d)

5.64

57.

For a basic solution, which of the following is correct?

a)

PH = POH and PH = 12 PKw = 7

b)

PH < 7 and [H+] < 10-7

c)

PH > POH and PKw - PH < 7

d)

PH < POH and PKw - PH > 7

58.

Which one of the following aqueous solutions will be basic?

a)

Na2CO3

b)

NaCl

c)

NH4Cl

d)

K2SO4

59.

A salt is formed from the weak acid (HCN) whose Ka= 4.9x10-10 and a weak base (NH4OH) whose Kb= 1.8x10-5. What do you expect about the solution of the salt formed?

a)

Its PH value is less than 7.

b)

Its PH value is greater than 7.

c)

Its PH value is equal to 7.

d)

Impossible to predict.

60.

In titration process, the amount of solution to be determined is called_______

a)

Titrant

b)

Titrand

c)

Known solution

d)

End point

61.

The acid -base indicator methyl red has a Ka of 1x10-5. Its acidic form is red while its alkaline form is yellow. If it is added to a colorless solution with a PH = 7, the color of the solution will be__________.

a)

Pink

b)

Orange

c)

Yellow

d)

Red

62.

Which of following titrations will have an equivalence point at a PH > 7.00?

a)

Weak acid with a strong base.

b)

Strong acid with a strong base.

c)

Weak acid with a weak base.

d)

Strong acid with a weak base.

63.

What is an equivalent of H2SO4?

a)

49

b)

1

c)

2

d)

98

64.

A 25 ml sample of 0.1050 M H2SO4 is titrated with a NaOH solution of unknown concentration. The phenolphthalein end point was reached when 17.23ml of NaOH had been added. What is the concentration of NaOH?

a)

0.3M

b)

0.6M

c)

0.1M

d)

0.1050M

65.

Which of the following reactions represents a redox-reaction?

a)

NaOH + HNO3 NaNO3 + H2O

b)

2H2SO4 + Cu CuSO4 + 2H2O + SO2

c)

H2SO4 + Na2CO3 Na2SO4 + H2O + CO2

d)

Mg3N2 + 3H2O 2NH3 + 3MgO

66.

When the following redox - reaction is balanced correctly, what is the coefficient of H2O?

a)

7

b)

36

c)

24

d)

12

67.

In the reaction: (NH4)2Cr2O7 Cr2O3 + N2 8 + 4H2O What is the oxidation state of N and chromium changes respectively?

a)

-3 to 0 and +6 to +3

b)

+3 to 0 and +3 to +6

c)

-4 to 0 and +6 to +2

d)

Unpredictable

68.

What are reducing agents? They are

a)

Species that decrease in oxidation number.

b)

Substances that are reduced.

c)

Substances that gained electrons.

d)

Substances that are oxidized.

69.

The charge-carriers in metallic conduction are_________.

a)

Anions only

b)

Cations and anions

c)

Delocalized electrons

d)

All of the above

70.

Which of the following ions is difficult to oxidized?

a)

Na+

b)

Ag+1

c)

H+

d)

Fe+3

71.

Which one of the following metals is unreactive with acid or water?

a)

Lead

b)

Zinc

c)

Sodium

d)

Copper

72.

The anode reaction is the same in all of the following electrolytic cells, Except

a)

Electrolysis of diluted sodium chloride solution

b)

Electrolysis of brine

c)

Electrolysis of fused sodium chloride

d)

Electrolysis of concentrated hydrochloric acid

73.

In electrolytic cell, the cations move towards the ____and the electrons flow from the _____to the ____.

a)

anode, cathode, cathode

b)

cathode, anode, cathode

c)

anode, anode, cathode

d)

cathode, cathode ,anode

74.

Two cells are connected in series. One contains CuSO4 solution and the other contains Al2(SO4)3 solution as electrolytes. If 45g of Al is deposited in the cell contain  Al2(SO4)3  solution. How much copper is deposited in the other cell?

a)

320g

b)

180g

c)

160g

d)

16g

75.

For the half- reaction: Mg+2 + 2e Mg What is the mass of magnesium formed up on passage of a current of 60A for a period of 2x103sec?

a)

5g

b)

14.9g

c)

10g

d)

28.8g

76.

Which one of the following is the industrial application of electrochemistry?

a)

For the extraction of metals

b)

For manufacturing of non-metals

c)

For electroplating process

d)

All of the above

77.

Which of the following is TRUE about the silver plating of spoon made of iron?

a)

The electrolyte is iron (II) sulfate.

b)

The silver is act as cathode.

c)

The spoon is act as cathode.

d)

None of the above

78.

Consider the standard voltaic or Galvanic cell: Fe, Fe+2 versus Au, Au+3. What is the cathode and the E0 cell for the cell? E0red (Au+3/Au) =1.50V, E0red (Fe+2/Fe)= -0.44V.

a)

Au, +1.94V

b)

Au, +1.06V

c)

Fe, -0.44V

d)

Fe, -1.94V

79.

Which of the following substances is used as an electrolyte in car battery?

a)

HCl(aq)

b)

H2SO4(aq)

c)

H2O

d)

CH3COOH(aq)

80.

For the following hypothetical equation, in aqueous solution, what is the correct representation of the cell notation?

a)

A(s) / A2+(aq) // B2+(aq) / B(s)

b)

A2+(aq) / A(s) // B(s) / B2+(aq)

c)

B2+(aq) / B(s) // A2+(aq) / A(s)

d)

B(s) / B2+(aq) / / A2+(aq) / A(s)

81.

Consider the reaction: Cu+2( 0.01M) + Fe(s) Cu(s) + Fe+2( 0.001M) , Eocell = 1.1V What is the value of Ecell ?

a)

+ 1.0704V

b)

- 1.0704V

c)

+1.1296V

d)

- 1.1296V

82.

Which of the following metals is suitable for uses as sacrificial anodes to protect against corrosion of underground iron pipes?

a)

Lead

b)

Iron

c)

Sodium

d)

Magnesium

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