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BASIC CHEMISTRY

Total questions: 104

Worksheet time: 2hrs 37mins

Name
Class
Date
1.

If an atom is represented as ₁₁X²³ , which of the following deduction is correct?

a)

It contains 12 protons

b)

It forms a covalent chloride

c)

Its atomic number is 23

d)

It has 12 neutrons

2.

The number of atoms in one mole of a substance is equal to the

a)

Mass number

b)

Oxidative number

c)

Atomic number

d)

Avogadro's number

3.

In the equation below wCaCl2+xNa3PO4 yCa3PO42+ zNaCl What are the values of the letters w,x,y,z?

a)

3,2,1,6 respectively

b)

6,1,2,6 respectively

c)

6,2,2,6 respectively

d)

3,2,3,1 respectively

4.

What is the relative molecular mass of Na2SO4? [Na=23, S=32, O=16]

a)

172

b)

168

c)

142

d)

133

5.

Molecular nitrogen gas (N2) reacts with oxygen gas (O2) to form dinitrogen pentoxide (N2O5). A balanced equation for this reaction is

a)

N2+O2 2N2O

b)

5N2+2O2 2N5O2

c)

5N2+2O2 2N2O5

d)

2N2+5O2 2N2O5

6.

Amount of a substance is expressed in

a)

mole

b)

grams

c)

kilograms

d)

mass

7.

Determine the mass of CO2 produced by burning 104g of ethyne [C2H2]

a)

256g

b)

352g

c)

416g

d)

512g

8.

If 200cm3 of a gas at s.t.p. has a mass of 0.268g, what is its molar mass? (Molar volume of a gas at s.t.p. =22.4dm3)

a)

300g

b)

200g

c)

150g

d)

15g

9.

Which of the following ions has electronic configuration different from the other?

a)

17Cl-

b)

8O2-

c)

12Mg2+

d)

13Al3+

10.

Which of the following electronic configuration represents that of an atom with 10 protons in its ground state?

a)

1s1,2p1,3d8

b)

1s1,2s1,2p53s23p1

c)

1s2,2s1,2p6,3s1

d)

1s2,2s2,2p6,3s0

11.

How many moles are there in 12g of CO2? [C=12, 0=16]

a)

0.27

b)

0.47

c)

0.16

d)

0.32

12.

Which of these is the correct way of filling atomic orbitals in accordance with Hund's Rule for Carbon atom?

a)

↿⇂ ↿⇂ ↿⇂

b)

↿⇂ ↿ ↿ ↿⇂

c)

↿⇂ ↿⇂ ↿ ↿

d)

↿ ↿⇂ ↿⇂ ↿

13.

Calculate the oxidation of the element in bold print in KMnO4-

a)

6

b)

7

c)

5

d)

4

14.

H2SO4 + xKOH ==> K2SO4 + yH2O. The value for x and y in the above equation is

a)

2 and 2

b)

2 and 3

c)

2 and 1

d)

4 and 2

15.

The volume occupied by 17g of H2S at s.t.p. is [H=1, S=32, Molar volume=22.4dm3]

a)

11.2 dm3

b)

17.0 dm3

c)

34.0 dm3

d)

44.8 dm3

16.

What is the number of atoms of chlorine present in 5.85g of NaCl? [Avogadro's Number=6.02×1023]

a)

6.02×1022

b)

5.85×1023

c)

6.02×1023

d)

5.85×1024

17.

What is the volume occupied by 6.4g of the oxygen gas? [O=16; Molar volume of a gas at s.t.p=22.4dm3]

a)

4.48dm3

b)

8.96dm3

c)

0.40dm3

d)

0.20dm3

18.

Calculate the number of Cu atoms in 0.635g of Cu

a)

1 mole

b)

0.1 mole

c)

0.01 mole

d)

0.001 mole

19.

Aufbau's Rule state that

a)

Only two electrons can occupy an orbital

b)

Electrons enter the lowest available energy level

c)

Electrons remain unpaired if possible

d)

Orbitals are region in space where one can find electron

20.

What mass of Pb(No₃)₂ would be required to produce 9g of PbCl₂ on the addition of excess NaCl solution? [Pb=207, Na=23, O=16, N=14]

a)

10.7g

b)

1.2g

c)

6.4g

d)

5.2g

21.

What is the amount of magnesium that would contain 1.20×1024 particles? [ Mg=24, Avogadro'sconstant=6.02×1023]

a)

0.25 moles

b)

2.0 moles

c)

12.0 moles

d)

24.0 moles

22.

Using s-p-d-f notation, what is the electron configuration for aluminum cation, Al3+

a)

1s², 2s², 2p⁶, 3s², 3p¹

b)

1s², 2s², 2p⁶, 3s¹

c)

1s², 2s², 2p⁶, 3d1

d)

1s2, 2s1

23.

IUPAC name of the compound Ag2CO3 is

a)

Silver trioxocarbonate (IV)

b)

Silver (II) trioxocarbonate (IV)

c)

Silver carbonate

d)

Silver (II) carbonate (III)

24.

Which of these formulae belongs to Iron (II) oxide?

a)

Fe2O3

b)

FeO

c)

Fe3O2

d)

Fe2O

25.

A compound has an empirical formula CH2O and molecular mass of 90. What is the compound's molecular formula? [H=1.00;C=12.00;O=16.00]

a)

C4H10O2

b)

C3H10O2

c)

C3H6O3

d)

C2H2O4

26.

How many electrons are present in an atom whose number of proton is 18 and the mass number is 40

a)

40

b)

20

c)

58

d)

18

27.

The maximum number of electron in M-shell is

a)

2

b)

8

c)

18

d)

32

28.

Which of the following ions has the electron configuration of 2, 8, 8?

a)

Na+

b)

Mg2+

c)

F-

d)

Cl-

29.

The elements that belong to the third period of the periodic table are

a)

Li, Be, Al and P

b)

Na, P, O and Cl

c)

Na, Mg, S and Ar

d)

B, C, N and O

30.

The percentage of water of crystallization in ZnSO4.7H2O is

a)

33%

b)

44%

c)

55%

d)

87%

31.

Which of these is not an electrolyte?

a)

ZnCl2(aq)

b)

NaOH(aq)

c)

Na2SO4(aq)

d)

HCl(g)

32.

Which of these ions will compete favourably with H+ ion in a solution which contains their salt during electrolysis?

a)

Hg+

b)

Li+

c)

Sn2+

d)

Ca2+

33.

In reaction involving solid and liquid reactants, the rate of reaction would be affected by the

a)

relative density of the liquid reactant

b)

vapour pressure of the liquid reactant

c)

particle size of the solid reactant

d)

molar-mass of the solid reactant

34.

The collision theory proposes that

a)

reactants collide more frequently to bring about reduction in the reaction rate

b)

all collisions of reactants are effective

c)

reactants must collide with a certain minimum amount of energy to form products

d)

the lower the collision the faster the reaction rate

35.

If the value of △H is negative, this implies that the reaction is

a)

Slow

b)

Exothermic

c)

Spontaneous

d)

Irreversible

36.

A concentrated solution containing H+, Cu2+, OH- and Cl- was electrolyzed using platinum electrodes. The ions that will be discharged at the cathode is

a)

Cu2+

b)

Cl-

c)

H+

d)

OH-

37.

The solution that will conduct the highest amount of electricity is

a)

0.5 moldm-3 of hydrochloric acid

b)

2.0 moldm-3 of hydrochloric acid

c)

0.5 moldm-3 ethanoic acid

d)

2.0 moldm-3 ethanoic acid

38.

The acid used in electrolysis of water is dilute

a)

HNO3

b)

CH3COOH

c)

H2SO4

d)

HCl

39.

Which of the following metals is purified commercially by electrolysis?

a)

Zn

b)

Fe

c)

Sn

d)

Cu

40.

Which of the following will not increase the reaction rate?

a)

Heating the hydrogen peroxide

b)

Adding a pinch of MnO2 to the reactant

c)

Adding water to the reactant

d)

Exposing the reactant to the sunlight

41.

If an atom is represented as 1123X, which of the following deduction is correct?

a)

Its atomic number is 23

b)

It forms a covalent chloride

c)

It contains 12 protons

d)

It is an alkali metal

42.

What quantity of aluminum is deposited when a current of 110A is passed through a solution of an aluminum salt for 1930s? [Al=27, 1F=96500Cmol-1]

a)

0.2g

b)

1.8g

c)

5.4g

d)

14.2g

43.

_____ reaction takes place at the cathode during electrolysis

a)

Displacement

b)

Oxidation

c)

Reduction

d)

Decomposition

44.

What quantity of copper will be deposited by the same quantity of electricity that deposited 9.0g of aluminum? [Al=27;Cu=64]

a)

64g

b)

32g

c)

7.1g

d)

3.2g

45.

Chemical equilibrium is attained when

a)

all the reactants have been completely used up

b)

the reaction goes to completion

c)

the concentration of products and reacts remain unchanged

d)

the concentration of products and reactants are equal

46.

The type of reaction represented by the graph above is

a)

Endothermic

b)

Exothermic

c)

Catalytic

d)

spontaneous

47.

Which of the following statements about an exothermic reaction is correct?

a)

The products have less heat content than reactants

b)

The system absorbs heat from the surrounding

c)

The activation energy is high

d)

The enthalpy change is positive

48.

The change in enthalpy when 1 mole of the compound is formed under standard condition is known as

a)

Standard enthalpy of neutralization

b)

Standard enthalpy of formation

c)

Standard enthalpy of combustion

d)

Standard enthalpy of solution

49.

In a chemical reaction, ∆H is positive when

a)

Hp>HR

b)

Hp

c)

Hp=HR

d)

Hp=0

50.

A reversible reaction can only take place in

a)

An open system

b)

A closed system

c)

A disrupted system

d)

The atmosphere

51.

A catalyst increases the rate of chemical reaction by providing a pathway that

a)

raise the activation energy

b)

increase the temperature

c)

lowers the activation energy

d)

increase the concentration

52.

What is the effect of increasing the pressure of on the equilibrium reaction above?

a)

The equilibrium is shifted to the left

b)

The equilibrium is shifted to the right

c)

There is no effect

d)

More H2(g) is produced

53.

When sodium hydroxide is dissolved in distilled water, the reaction is

a)

entropic

b)

endothermic

c)

exothermic

d)

neutralization

54.

The minimum energy possessed by reacting particles for reaction to take place is termed

a)

Collision force

b)

Activation energy

c)

Heat of Reaction

d)

Catalytic energy

55.

For a chemical equation to take place, all these conditions must be satisfied EXCEPT one.

a)

Reacting particles must collide

b)

Reacting particles must be far apart

c)

Reacting particles must possess minimum energy

d)

Activation energy must be equal to barrier energy

56.

What can be done to increase the surface area of solid reactants to achieve high rate of chemical reaction?

a)

By grinding them into powder

b)

By subjecting the reactants to high pressure

c)

By altering the direction of reaction

d)

By using reactant of different densities

57.

The characteristic internal energy possessed by a substance is termed

a)

Entropy

b)

Enthalpy

c)

Gibb's free energy

d)

Heat energy

58.

State the Le Chatelier's Principle.

4 lines
59.

What is meant by the Enthalpy change of a reaction?

4 lines
60.

What is meant by the Closed system?

4 lines
61.

Sketch an energy profile diagram for an endothermic reaction.

4 lines
62.

Name the enthalpy changes involved in each of the following processes: dissolution of sodium hydroxide in water, burning of carbon in air, reaction of dilute sodium hydroxide with dilute hydrochloric acid.

4 lines
63.

Dip red litmus paper into each solution and observe.

4 lines
64.

Dip blue litmus paper into each solution and observe.

4 lines
65.

Add few drops of methyl orange/phenolphthalein indicator into each of the solutions in the test tubes and observe.

4 lines
66.

Record your pH range using the pH paper.

4 lines
67.

Record your inferences by classifying each of the solutions into acids, bases or neutral.

4 lines
68.

Classify the following into acidic, basic and neutral substances: Lemon juice, Yoghurt, Soap, Egg white, Toothpaste, Tomato juice, Bleach, Cooking oil, Sugar solution, Distilled water.

4 lines
69.

Put all of C in a test tube and add about 5cm3 of distilled water. Shake thoroughly and test the resulting solution with litmus paper. Divide the solution into three portions.

4 lines
70.

To the first portion, add NaOH(aq) in drops, then in excess.

4 lines
71.

To the second portion, add NH3(aq) in drops, then in excess.

4 lines
72.

To the third portion, add AgNO3(aq) followed by HCl(aq).

4 lines
73.

Put all of D in a test tube and add about 5cm3 of distilled water. Shake thoroughly and feel the test tube.

4 lines
74.

To about 2cm3 of the solution, add HCl(aq).

4 lines
75.

State whether the following reactions are exothermic or endothermic reactions: Melting of ice, Explosion of fireworks, Formation of ionic compounds, Respiration, Electrolysis of water, Rusting of iron.

4 lines
76.

Given that cosx=0.7431, 0o

a)

1.3383, 0.3839

b)

1.8333, 0.3383

c)

1.3383, -0.3839

d)

1.8333, -0.3389

77.

Without using tables, find the value of 1+sec230o

a)

213

b)

2

c)

32

d)

34

78.

Find the value of x in the diagram below

a)

2

b)

6

c)

46

d)

43

79.

Given that sin60o=32 and cos60o=12 , Evaluate 1-sin60o1+cos60o

a)

2+33

b)

1-33

c)

1+33

d)

2-33

80.

Calculate in surd form, the value of tan15o

a)

32

b)

23

c)

3

d)

2

81.

Express 7π6radians in degrees

a)

315o

b)

210o

c)

105o

d)

75o

82.

Calculate, in surd form, the value of tan15o

a)

2+3

b)

1+3

c)

3 -1

d)

23

83.

If sin∅=12 and cos∅=-32, what is the value of ∅?

a)

30o

b)

60o

c)

90o

d)

150o

84.

The trigonometric function illustrated in the graph above is

a)

sine

b)

cosine

c)

sine and cosine

d)

sine, cosine and tangent

85.

Which of the graphs is the graph of y=sinx?

a)

L

b)

M

c)

N

d)

L and M

86.

What is the amplitude of the graph L?

a)

2

b)

12

c)

0.2

d)

1

87.

Given that x=30o and y=60o, Evaluate without using tables or calculator sinx + cosxsiny + cosy

a)

3

b)

2

c)

1

d)

-1

88.

1+tan2β equals

a)

cot2β

b)

cosec2β

c)

arctanβ

d)

sec2β

89.

The midpoint of M(4,-1) and N(x, y) is P(3, -4). Find the coordinates of N

a)

(2, 3)

b)

(2, _7)

c)

(-1, -3)

d)

(-10, -7)

90.

Find the distance between the points (2, 5) and (5, 9)

a)

4 units

b)

5 units

c)

12 units

d)

14 units

91.

If sinθ=k, find tanθ, where 00≤θ≤90o

a)

1-k

b)

kk-1

c)

k1-k2

d)

k1-k

92.

If cos x=ab , find cosec x

a)

bb-a

b)

ba

c)

bb-a

d)

b-ab

93.

Given that x=60o, where 0o≤x≤90o Evaluate 1-sin2xcosx

a)

22

b)

2

c)

2 2

d)

12

94.

The distance between points (-2, x) and (-1, 3) is 65 units. Find x

a)

-5

b)

1

c)

5

d)

0

95.

Solve the equation: 3cosθ+1=0

a)

360o

b)

270o

c)

109.47o

d)

70.53o

96.

Solve the equation: 3sinθ-4cosθ=0, if θ is acute

a)

53.12o

b)

46.48o

c)

46.43o

d)

36.38o

97.

What is the value of tan100o?

a)

-5.671

b)

5.671

c)

-56.71

d)

56.71

98.

If sinx=-sin 70o, 0o

a)

110o, 250o

b)

110o, 290o

c)

200o, 250o

d)

250o, 290o

99.

If tanα=12 and tanβ=13 and both α and β are acute, find tanα +tanβ1-tanαtanβ

a)

0.015

b)

1.00

c)

10.00

d)

45.00

100.

What is the maximum value of the graph below?

a)

1 at π2

b)

-1 at 3π2

c)

1 at 180, 2π

d)

-1 at 2π

101.

Which of these statements is not correct about sine and cosine graphs?

a)

Both have an amplitude of 1

b)

Both have a period of 360o or 2π radians

c)

Both have the same curve which is shifted along the x-axis

d)

Both can overlap if their origins are the same

102.

Simplify (1-sinθ)(1+sinθ

a)

cos2θ

b)

1+cosθ

c)

1-cosθ

d)

sin2θ

103.

Solve the equation, cos7θ=sin5θ where 0o<θ<90o

a)

75o

b)

7.5o

c)

0.75o

d)

750o

104.

If cosθ=32, and θ is less than 90o, calculate cot (90-θ)sin2θ

a)

433

b)

43

c)

32

d)

23

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