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JAMB questions for "Chemistry :: Air"
Q1

Carbon (II) oxide is considered dangerous if inhaled mainly because it

A

competes with carbon (IV) oxide in the blood

B

can cause lung cancer

C

can cause injury to the nervous system

D

competes with oxygen in the blood

E

Answer: D

Air
Q2

The major source of oxides of nitrogen is from the burning of

A

coal

B

wood

C

fuel

D

chlorofluorocarbons

E

Answer: C

Air
Q3

Two equal bulbs one containing ammonia and the other nitrogen, are opened mouth-to-mouth to each other at room temperature. The entropy in the mixture of gases is likely to 

A

remain unchanged

B

increase

C

decrease

D

change

E

Answer: C

Air
Q4

In the diagram above which of the curves represents the evolution of oxygen with time in the equation 2KClO3(s) → 2KCl(s) + 3O2(g)?

A

X

B

Y

C

Z

D

R

E

Answer: D

Air
Q5

The diagram represents the electron sub-level for

A

carbon

B

nitrogen

C

oxygen

D

flourine

E

Answer: C

Air
Q6

Air boiled out of water as steam is richer in 

A

nitrogen and oxygen

B

carbon (IV) oxide and oxygen

C

noble gases and carbon (IV) oxide

D

oxygen and noble gases

E

Answer: B

Air
Q7

The presence of nitrogen in air is to slow down 

A

respiration and transpiration

B

corrosion and respiration

C

combustion and corrosion

D

respiration and combustion

E

Answer: C

Air
Q8

In the diagram above, gas X is 

A

hydrogen

B

chlorine

C

oxygen

D

hydrogen chloride

E

Answer: C

Air
Q9

On heating, which of the following compounds will decompose to the free metal, nitrogen (IV) oxide and oxygen?

A

Ca(NO3)2

B

Cu(NO3)2

C

AgNO3

D

NaNO3

E

Answer: C

Air
Q10
The volume of 2.5 moles of oxygen at s.t.p. is
A
50.0 dm3
B
84.0dm3
C
28.0 dm3
D
56.0 dm3
E

Answer: D

Air
Q11
In a flame test for calcium, the flame appears 
A
blue when viewed through a blue glass
B
green when viewed through a blue glass
C
orange-red when viewed through a blue glass
D
brick-red when viewed through a blue glass
E

Answer: B

Air
Q12
The property used in the industrial preparation of nitrogen and oxygen from air is
A
rate of diffusion
B
solubility
C
density
D
boiling point
E

Answer: D

Air
Q13
Natural water collected from rivers and ponds contains oxygen, carbon (VI) oxide and 
A
chlorine
B
hydrogen
C
sulphur (IV) oxide
D
nitrogen
E

Answer: D

Air
Q14
Which of the following mixtures of gases is likely to burn in flame?
A
Helium and neon
B
Neon and nitrogen
C
Neon and hydrogen
D
Nitrogen and helium
E

Answer: C

Air
Q15
Oxyacetylene flame is used for iron-welding because it
A
evolves a lot of heat when burnt
B
dissociates to produce carbon (VI) oxide and oxygen
C
makes the iron metal solidify very quickly
D
combines with oxygen to give a pop sound
E

Answer: A

Air
Q16
The processes which returns carbon (IV) oxide to the atmosphere include
A
respiration, decay and combustion
B
photosynthesis, respiration and transpiration
C
ozone depletion, combustion and decay
D
photosynthesis, decay and respiration
E

Answer: A

Air
Q17
Phosphorous is stored under water to prevent it from
A
smelling
B
dehydrating
C
catching fire
D
becoming inert
E

Answer: C

Air
Q18
Potassium vapour burns with a 
A
blue flame
B
brick-red flame
C
violet flame
D
golden-yellow flame
E

Answer: C

Air
Q19
the noble gas, argon, is used for
A
electric welding
B
welding brass
C
undeerwater welding
D
steel welding
E

Answer: A

Air
Q20
Nitrogen obtained from the liquifaction of air has a higher density than that obtained from nitrogen containing compounds because the former contains
A
water vapour
B
oxygen
C
carbon (IV) oxide
D
rare gases
E

Answer: D

Air
Q21
Which of the following will have its mass increased when heated in air?
A
Helium 
B
Magnesium
C
Copper pyrites
D
Glass
E

Answer: B

Air
Q22
Helium is often used in observing ballons because it is
A
light and combustible
B
light and non-combustible
C
heavy and combustible
D
heavy and non-combustible
E

Answer: B

Air
Q23
When plastics and packaging materials made from chloroethene are burnt in the open, the mixture of gases released into the atmosphere is most likely to contain
A
ethane
B
chlorine
C
hydrogen chloride
D
ethene
E

Answer: B

Air
Q24
The set-up above would be useful for determining the amount of
A
oxygen in air
B
water vapour in air
C
CO2 in air
D
argon in air
E

Answer: B

Air
Q25
A quantity of air was passed through a weighed amount of alkaline pyrogallol. An increase in the weight of the pyrogallol would result from the absorption of
A
nitrogen
B
neon
C
argon
D
oxygen                                                                                                                                                                                                                                                                                                                                                                                                
E

Answer: D

Air
Q26
Smoke consists of 
A
solid particles dispersed in liquid
B
solid or liquid particles dispersed in gas
C
gas or liquid particles dispersed in liquid
D
liquid particles dispersed in liquid
E

Answer: B

Air
Q27
Which of the following is used in fire extinguishers?
A
Carbon(II)oxide
B
Carbon(IV)oxide
C
Sulphide(VI)
D
Ammonia
E

Answer: B

Air
Q28
The appropriate volume of air containing 10 cm3 of oxygen is
A
20 cm3
B
25 cm3
C
50 cm3
D
100 cm3
E

Answer: C

Air
Q29
The nitrogen gas obtained by burning an excess of phosphorous in air has a density higher than the nitrogen from nitrogen compounds because the nitrogen from air is contaminated with
A
some unburnt phosphorous
B
P2O5 vapour
C
some oxygen
D
rare gases
E
carbondioxide

Answer: D

Air
Q30
When air is passed through alkaline pyrogallol and then over quick lime, the only gases left are
A
nitrogen and carbondioxide
B
the rare gases
C
nitrogen and oxygen
D
nitrogen and the rare gases
E
nitrogen, carbondioxide and the rare gases

Answer: D

Air
Q31
When air is compressed
A
its density decreases
B
it solidifies
C
its temperature decreases
D
its temperature increases
E
its temperature remains unchanged

Answer: C

Air
Q32
Which of the following statements about phosphorous is NOT correct?
A
Phosphorous is a solid mineral
B
Phosphorous is obtained by oxidation of phosphates
C
Phosphorous exist in two allotrophic forms
D
Both forms of Phosphorous are interconvertible
E
yellow phosphorous ignites when rubbed on a rough surface

Answer: B

Air
Q33
The best way of collecting chlorine is
A
by downward displacement of air
B
by upward displacement of air.
C
over water.
D
under water.
E
over mercury.

Answer: B

Air
Q34
When a piece of charcoal enclosed in a cylinder containing air is ignited
A
total volume of air is increased
B
the relative amount of oxygen present is increased
C
the relative amount of carbondioxide present is decreased
D
the relative amount of carbondioxide present is increased
E
the ratio of oxygen to nitrogen in the system is increased

Answer: D

Air
Q35
Phosphorus burns in oxygen according to the equation:   P4 + 5O2 → P4O10. How many litres of oxygen will be required at S.T.P for complete oxidation of 12.4g of Phosphorus?   (P = 31, O = 16 and molar volume of a gas at S.T.P = 22.4 litres)
A
5.20
B
11.20
C
2.24
D
20.20
E
6.20

Answer: B

Air
Q36
Which of the following compounds will form a solution if exposed to air?
A
Na2CO3.10H2O
B
NaNO3
C
CuCO4
D
CaCl2
E
Na2SO4 10H2O

Answer: D

Air