Year : 
1990
Title : 
Chemistry
Exam : 
JAMB Exam

Paper 1 | Objectives

21 - 30 of 49 Questions

# Question Ans
21.

The label on a reagent bottle containing a clear organic liquid dropped off.The liquid was neutral to litmus and gave a colourless gas with metallic sodium. The liquid must be an?

A. alkanoate

B. alkaene

C. alkanol

D. alkane

C
22.

Alkaonic acids have low volatility compared with alkanols because they?

A. are more polar than alkaonls

B. have two oxygen atoms while alkanols have one

C. form hydrogen bonds while alkanols do not

D. form two hydrogen bonds while alkanols form one

D
23.

The octane number of a fuel whose performance is the same as that of a mixture of 55 g of 2,2,4- trimethly pentane and 45 g of n-heptane is ?

A. 45

B. 55

C. 80

D. 100

B
24.

Which of the following is formed when maltose reacts with concentrated tetraoxosulphate (VI) acid ?

A. Carbon (IV) oxide

B. Coal tar

C. Charcoal

D. Toxic fumes

C
25.

If a gas occupies a container of volume 146 cm3 at 18°C and 0.97`atm, its volume 146cm3 at s.t.p is?

A. 133

B. 146

C. 266

D. 292

Detailed Solution

V1 = 146cm3 T1 = 273 + 118 = 291 k

P1 = 0.971 atmosphere

V2 = ? T2 = 273K P2 = 1 atom

V2 = (0.971 atom χ 146cm3 χ 273k)/(1atm χ 291k) = 132997 0r = 133cm3
26.

The volume occupies by 1.58g of a gas at s.t.p is 500cm3. What is the relative molecular mass of the gas?

(G.M.V at s.t.p = 22.40dm3)

A. 28

B. 32

C. 44

D. 71

Detailed Solution

500cm3 = 1.58g

=22400cm = (1.58g)/(500cm3) χ 22400cm3) = 70.78 g
= 71g
27.

Equal volumes of CO,SO2, NO2 and H2S were released into a room at the same point and time. Which of the following gives the order of diffusion of the gases to the opposite corner of the room?
(S = 32, C = 12, O = 16, N = 14, H = 1)

A. CO, SO2,NO2,H2S

B. SO2,NO2,H2S,CO

C. CO,H2S,SO2,NO2

D. CO,H2S,NO2,SO2

Detailed Solution

- At a constant temperature and pressure, the rate lof diffusion of a gas is inversely proportional to the rate of its relative molecular mass.
- The higher the RMM of a gas the Lower the rate of diffusion and vice versa
- Hence; CO,H2S,NO2,SO2 will be the order of diffusion.
28.

A basic postulate of the kinetic theory of gases is that the molecules of a gas move in straight lines between collisions. This implies that?

A. collisions are perfectly elastic

B. forces of repulsion exist

C. forces of repulsion are in equilibrium

D. collision are inelastic

Detailed Solution

Collisions between gas particles or collisions with the walls of the container are perfectly elastic. None of the energy of a gas particle is lost when it collides with another particle or with the walls of the container.
29.

.....................P....Q.....R......S
Proton..............13....16....17.....19
Electron............13....16....17.....19
Neutron.............14....16....35.....20

Which of the four atoms P,q,R and in S in the above data can be described by the following properties relative atomic mass is greater than 30 but less than 40; it has an odd atomic number and forms a unipositive ion in solution?

A. P

B. Q

C. R

D. S

D
30.

Which of the following terms indicates the number of bonds that can be formed by an atom?

A. Oxidation number

B. Valence

C. Atomic number

D. Electronegativity

B
21.

The label on a reagent bottle containing a clear organic liquid dropped off.The liquid was neutral to litmus and gave a colourless gas with metallic sodium. The liquid must be an?

A. alkanoate

B. alkaene

C. alkanol

D. alkane

C
22.

Alkaonic acids have low volatility compared with alkanols because they?

A. are more polar than alkaonls

B. have two oxygen atoms while alkanols have one

C. form hydrogen bonds while alkanols do not

D. form two hydrogen bonds while alkanols form one

D
23.

The octane number of a fuel whose performance is the same as that of a mixture of 55 g of 2,2,4- trimethly pentane and 45 g of n-heptane is ?

A. 45

B. 55

C. 80

D. 100

B
24.

Which of the following is formed when maltose reacts with concentrated tetraoxosulphate (VI) acid ?

A. Carbon (IV) oxide

B. Coal tar

C. Charcoal

D. Toxic fumes

C
25.

If a gas occupies a container of volume 146 cm3 at 18°C and 0.97`atm, its volume 146cm3 at s.t.p is?

A. 133

B. 146

C. 266

D. 292

Detailed Solution

V1 = 146cm3 T1 = 273 + 118 = 291 k

P1 = 0.971 atmosphere

V2 = ? T2 = 273K P2 = 1 atom

V2 = (0.971 atom χ 146cm3 χ 273k)/(1atm χ 291k) = 132997 0r = 133cm3
26.

The volume occupies by 1.58g of a gas at s.t.p is 500cm3. What is the relative molecular mass of the gas?

(G.M.V at s.t.p = 22.40dm3)

A. 28

B. 32

C. 44

D. 71

Detailed Solution

500cm3 = 1.58g

=22400cm = (1.58g)/(500cm3) χ 22400cm3) = 70.78 g
= 71g
27.

Equal volumes of CO,SO2, NO2 and H2S were released into a room at the same point and time. Which of the following gives the order of diffusion of the gases to the opposite corner of the room?
(S = 32, C = 12, O = 16, N = 14, H = 1)

A. CO, SO2,NO2,H2S

B. SO2,NO2,H2S,CO

C. CO,H2S,SO2,NO2

D. CO,H2S,NO2,SO2

Detailed Solution

- At a constant temperature and pressure, the rate lof diffusion of a gas is inversely proportional to the rate of its relative molecular mass.
- The higher the RMM of a gas the Lower the rate of diffusion and vice versa
- Hence; CO,H2S,NO2,SO2 will be the order of diffusion.
28.

A basic postulate of the kinetic theory of gases is that the molecules of a gas move in straight lines between collisions. This implies that?

A. collisions are perfectly elastic

B. forces of repulsion exist

C. forces of repulsion are in equilibrium

D. collision are inelastic

Detailed Solution

Collisions between gas particles or collisions with the walls of the container are perfectly elastic. None of the energy of a gas particle is lost when it collides with another particle or with the walls of the container.
29.

.....................P....Q.....R......S
Proton..............13....16....17.....19
Electron............13....16....17.....19
Neutron.............14....16....35.....20

Which of the four atoms P,q,R and in S in the above data can be described by the following properties relative atomic mass is greater than 30 but less than 40; it has an odd atomic number and forms a unipositive ion in solution?

A. P

B. Q

C. R

D. S

D
30.

Which of the following terms indicates the number of bonds that can be formed by an atom?

A. Oxidation number

B. Valence

C. Atomic number

D. Electronegativity

B