## Study Questions

— With QuizzerWeb

##### Chemistry 2013 QUIZ STUDY
The Correct Options are highlighted thus - >
.

1.

The saponification of an alkanoate to produce soap and alkanol involves

.
A.

dehydration

B.

esterification

C.

hydrolysis

D.

oxidation

2.
The presence, of an impurity in substance Will cause the melting point to
.
A. be zero.
B. reduce.
C. increase.
D. be stable.

3.

What volume of carbon(ll) oxide is produced by reacting excess carbon With 10dm3 of oxygen?

.
A.

5dm3

B.

20dm3

C.

15dm3

D.

10dm3

4.

From the diagram above, an ideal gas is represented by

.
A.

Z

B.

W

C.

X

D.

Y

5.
The rate of diffusion of a gas Y is twice that of Z. if the relative molecular mass of Y is 64 and the two gases diffuse under the same conditions, find the relative molecular mass of Z.
.
A. 32
B. 4
C. 8
D. 16

6.
The radioisotope used in industrial radiography for the rapid checking of faults in welds and casting is
.
A. carbon-14.
B. phosphorus-32.
C. cobalt-60.
D. iodine-131.

7.
How many unpaired electrons are in the p-orbitals of a fluorine atom?
.
A. 3
B. 0
C. 1
D. 2

8.

The radioactive emission with the least ionization power is

.
A.

α-particles

B.

X-rays.

C.

γ-rays.

D.

β-particles.

9.
The shape of the carbon(lV) oxide molecule is
.
A. pyramidal.
B. linear.
C. angular.
D. tetrahedral.

10.

Which of the following molecules is held to ether by hydrogen bond?

.
A.

CH4

B.

HBr

C.

H2SO4

D.

HF

11.

The bond formed between two elements with electron configurations 1s2 2s2 2p6 3s2 and 1s2 2s2 2p4 is

.
A.

metali

B.

covalent.

C.

dative.

D.

Ionic.

12.
The constituent of air that acts as a diluent is
.
A. nitrogen.
B. carbon(lV) oxide.
C. noble gases.
D. oxygen.

13.

Steam changes the colour of anhydrous cobalt(ll) chloride from

.
A.

white to red

B.

blue to white.

C.

blue to pink.

D.

white to blue.

14.

An example of a hygroscopic substance is

.
A.

CuO(s)

B.

MgCl2(s)

C.

CaCl2(s)

D.

NaOH(s)

15.

lf 24.4 g of lead(ll) trioxonitrate(V) were dissolved in 42 g of distilled water at 20°C; calculate the solubility of the solute in gdm-3.

.
A.

581

B.

0.581

C.

5.810

D.

58.100

16.
The solvent used for removing grease stain is
.
A. turpentine.
B. ammonia solution.
C. ethanol.
D. solution of borax in water

17.
in a water body, too much sewage leads to
.
A. a decrease in the temperature of the water which causes death of aquatic animals.
B. an increase in the number of aquatic animals in the water.
C. an increase in the bacterial population which reduces the level of oxygen in he water.
D. a decrease in the bacterial population which increases the level of oxygen in the water.

18.

10.0 dm3 of water was added, to 2.0 mol dm-3 of 2.5dm3 solution of HCl. What IS the concentration of the final solution in mol dm-3 ?

.
A.

0.4

B.

0.8

C.

2.0

D.

0.5

19.
Three drops of a 1.0 mol dm-3 solution of HCl was added to 20 cm3 of a solution of pH6.4 The pH of the resulting solution Will be
.
A. close to that of pure water.
B. less than 6.4
C. greater than 6.4
D. unaltere

20.
Which of the following substances is not a salt?
.
A. Aluminium oxide
B. Sodium hydrogentrioxosulphate(IV)
C. Sodium trioxocarbonate(IV)
D. Zinc chloride.

21.
An insoluble salt can be prepared by
.
A. the reaction of trioxocarbonate(IV) with an aci
B. double decomposition.
C. the action of dilute acid on an insoluble base.
D.

22.

2H2O(|)+2F2(g) → 4HF(aq) + O2(g)

in the reaction above, the substance that is being reduced is

.
A.

O2(g)

B.

H2O(l)

C.

F2(g)

D.

HF(aq)

23.

Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s).

In the reaction above, the oxidizmg agent is

.
A.

CuSO4(aq)

B.

ZnSO(aq)

C.

Cu(s)

D.

Zn(s)

24.
In an electrochemical cell, polarization is caused by
.
A. chlorine.
B. oxygen.
C. tetaoxosulphate(Vl) aci
D. hydrogen.

25.

Calculate the volume in cm3 of oxygen evolved as s.t.p. when a current of 5A is passed through acidified water for 193s

[F=96500 Cmol-1, Molar volume of a gas at s.t.p. = 22.4 dm3]

.
A.

224,000

B.

0.056

C.

0.224

D.

56,000

26.
In an endothermic reaction, if there is a loss in entropy the reaction will
.
A. be indeterminate.
B. be spontaneous.
C. not be spontaneous.
D. be at equilibrium.

27.

2SO2(g) + O2(g) ⇌ 2SO3(g)

ΔH= -395.7kJmol-1

In the reaction above, the concentration of SO3(g) can be increased by

.
A.

decreasing the pressure.

B.

decreasing the temperature.

C.

increasing the temperature.

D.

28.
The minimum amount of energy requ e reaction to take place is
.
A. lattice energy
B. ionization energy.
C. activation energy
D. kinetic energy.

29.

In the graph above, l activation  energy of the catalyzed reaction is

.
A.

100KJ

B.

300KJ

C.

250KJ

D.

200KJ

30.

​​​​​​3Fe(s)+4H2O(g) ⇌ Fe3O4(s) +4H2(g)

The equilibrium constant, K, of the reaction above is represented as

.
A.

$\frac{\left[{\mathrm{Fe}}_{3}{\mathrm{O}}_{4}\right]\left[{\mathrm{H}}_{2}\right]}{\left[\mathrm{Fe}\right]\left[{\mathrm{H}}_{2}\mathrm{O}\right]}$

B.

$\frac{{\left[{\mathrm{H}}_{2}\mathrm{O}\right]}^{4}}{{\left[{\mathrm{H}}_{2}\right]}^{4}}$

C.

$\frac{{\left[{\mathrm{H}}_{2}\right]}^{4}}{{\left[{\mathrm{H}}_{2}\mathrm{O}\right]}^{4}}$

D.

$\frac{{\left[\mathrm{Fe}\right]}^{3}{\left[{\mathrm{H}}_{2}\mathrm{O}\right]}^{2}}{\left[{\mathrm{Fe}}_{3}{\mathrm{O}}_{4}\right]{\left[{\mathrm{H}}_{2}\right]}^{4}}$

31.
Which of the following compounds is a neutral oxide?
.
A. Carbon (IV) oxide.
B. Sulphur(VI)oxide .
C. Sulphur (IV) oxide.
D. Carbon (II) oxide

32.
In the laboratory preparation of ammonia, the flask is placed in a slanting position so as to
.
A. prevent condensed water from breaking the reaction flask
B. enable the proper mixing of the reactants in the flask.
C. enhance the speed of the reaction
D. prevent formation of precipitate.

33.

Which of the following gases is employed as an anaesthesia?

.
A.

N2O

B.

NO2

C.

NH3

D.

NO

34.
Sulphur(lV) oxide is a strong reducing agent in the presence of water due to the formation of
.
A. hydroxide ion
B. sulphur (VI) oxide.
C. hydrogen sulphide.
D. trioxosulphate(IV) ion

35.
A metal that forms soluble trioxosulphate (lV) salt is
.
A. barium.
B. potassium.
C. manganese.
D. aluminium.

36.
Copper is displaced from the solution of its salts by most metals because it
.
A. is at the bottom of the activity series.
B. is very reactive.
C. is a transition element.
D. has completely filled 3d-orbitals.

37.
The colored nature of transition metal ions are associated With their partially filled
.
A. f-orbital.
B. s-orbital.
C. p-orbital.
D. d-orbital.

38.
Aluminium containers are frequently used to transport trioxonitiate(V) acid because aluminium
.
A. has a low density.
B. does not react with the acid
C. does not corrode.
D. has a silvery-white appearance.

39.
2-methylbutan-2-ol is an example of a
.
A. dihydric alkanol.
B. primary alkanol.
C. secondary alkanol.
D. tertiary alkanol.

40.
The reaction between ammonia and ethyl ethanoate produces
.
A. propanol and ethanamide.
B. propanol and propanamide.
C. ethanol and ropanamide.
D. ethanol and ethanamide.

41.
The decarboxylation of ethanoic acid will produce carbon(lV) oxide and
.
A. methane.
B. ethane.
C. propane.
D. butane.

42.

The compound above is an

.
A.

alkanone

B.

alkanoate

C.

alkanal

D.

akanol

43.

The compound that will react with sodium hydroxide to form salt and water only is

.
A.

C6H12O6

B.

(CH3)3COH

C.

CH3CH=CH2

D.

CH3CH2COOH

44.

Which of the following compounds in soluton will turn red litmus paper blue?

.
A.

R'OR''

B.

C.

R-NH2

D.

45.

The dehydration of ammonium salt of alkanoic acids produces a compound with the general fomula.

.
A.

B.

C.

R-NH2

D.

46.

Which of the following fractions is used as raw material for the cracking process?

.
A.

Kerosine

B.

Lubricating oils

C.

Bitumen

D.

Diesel oils

47.

An organic compund with a pleasant smell is likely to have a general formula

.
A.

CnH2n+1CHO

B.

CnH2n+1COOH

C.

CnH2n+1COOCnH2n+1

D.

CnH2n+1COCnH2n+1

48.

A primary amide is generally represented by the formula

.
A.

RCOOR

B.

RCONH2

C.

RCONHR

D.

RCONR2

49.

${\mathrm{CH}}_{3}-\begin{array}{c}\mathrm{H}\\ \underset{|}{\overset{|}{\mathrm{C}}}\\ {\mathrm{CH}}_{3}\end{array}-{\mathrm{CH}}_{2}-\mathrm{CH}={\mathrm{CH}}_{2}$

The IUPAC nomenclature for the compound above is

.
A.

4-methylpent-1-ene

B.

3-methylpent-2-ene

C.

2-methylpent-1-ene

D.

2-methylpent-4-ene

50.

An organic compound contains 60% carbon, 13.3% hydrogen and 26.7% oxygen. Calculate the empirical formula.

.
A.

C5H12O

B.

C3H8O

C.

C6H13O2

D.

C4H9O