Year : 
1985
Title : 
Chemistry
Exam : 
JAMB Exam

Paper 1 | Objectives

11 - 20 of 48 Questions

# Question Ans
11.

A man suspected of being drunk is made to pass his breath into acidified potassium dichlormate solution. If his breath carries a significant level of ethanol, the final colour of the solution is?

A. pink

B. purple

C. orange

D. blue-black

E. green

E
12.

When pollen grains are suspended in water and viewed through a microscope, they appear to be in a state of constant but erratic motion. This is due to?

A. convection currents

B. small changes

C. small changes in temperature

D. a chemical reaction between the pollen grain and water

E. the bombardment of the pollen grains by molecules of water

E
13.

The energy change (ΔH) for the reaction CO(g) + (1)/(2)O2(g) → is?

(ΔHi(CO) = -110.4 kJ mol-) (ΔHi(CO2) = -393 kJ mol-)

A. -503.7 kJ

B. +503.7kJ

C. -282.9 kJ

D. +282.9 kJ

E. +393.3 kJ

Detailed Solution

The energy charge for the reaction is - (393 - HO.4) = -282.9 kJ
14.

Tetraoxosulphate (IV) ions are finally tested using?

A. acidified silver nitrate

B. acidified barium chloride

C. ime-water

D. dilute hydrochloric acid

E. acidified lead nitrate

B
15.

An organic compound decolourized acidified KMnO4 solution but failed to react with ammoniacal silver nitrate solution. The organic compound is likely to be?

A. a carbonxylic acid

B. an alkane

C. an alkene

D. an alkyne

E. an akanone

C
16.

Solid sodium hydroxide on exposure to air absorbs a gas and ultimately gives another alkaline substance with the molecular formula?

A. NaOH.H2O

B. NaOH.N2

C. Na2CO3O

D. NaHCO3

E. NaNO3O

C
17.

Which of the following substances is the most abundant in the universe?

A. Carbon

B. Air

C. Water

D. Oxygen

E. Hydrogen

Detailed Solution

Element Abundance
Hydrogen 40,000
Helium 3,100
Oxygen 22
Neon 8.6
Nitrogen 6.6
Carbon 3.5
Silicon 1
Magnesium 0.91
Iron 0.6
Sulfur 0.38
18.

A colourless organic compound X was burnt in excess air to give two colourless and odourless gases, Y and Z, as products. X does not decolorize blue bromine vapour, Y turns lime milky while Z gives a blue colour with copper (ll) tetraoxosulphate (IV).
Compound X is?

A. an alkene

B. an alkane

C. an alkyne

D. tetrachloromethane

E. dichloromethane

B
19.

A colourless organic compound X was burnt in excess air to give two colourless and odourless gases, Y and Z, as products. X does not decolorize blue bromine vapour, Y turns lime milky while Z gives a blue colour with copper (ll) tetraoxosulphate (IV).
Y and Z are respectively?

A. CO2 and NH3

B. CO and NH3

C. SO2 and H2O

D. CO2 and H2O

E. SO2 and NH3

Detailed Solution

All saturated hydrocarbons are attacked by oxygen at elevated temperatures and, if oxygen is in excess, complete combustion to carbon dioxide and water occurs.
20.

Which of the following compounds is NOT the correct product formed when the parent metals is heated in air?

A. Calcium oxide (CaO)

B. Sodium oxide (Na2O)

C. Copper (ll) oxide (CuO)

D. Tri-iron tetroxide (Fe3O4)

E. Aluminium oxide (Al2O3)

D
11.

A man suspected of being drunk is made to pass his breath into acidified potassium dichlormate solution. If his breath carries a significant level of ethanol, the final colour of the solution is?

A. pink

B. purple

C. orange

D. blue-black

E. green

E
12.

When pollen grains are suspended in water and viewed through a microscope, they appear to be in a state of constant but erratic motion. This is due to?

A. convection currents

B. small changes

C. small changes in temperature

D. a chemical reaction between the pollen grain and water

E. the bombardment of the pollen grains by molecules of water

E
13.

The energy change (ΔH) for the reaction CO(g) + (1)/(2)O2(g) → is?

(ΔHi(CO) = -110.4 kJ mol-) (ΔHi(CO2) = -393 kJ mol-)

A. -503.7 kJ

B. +503.7kJ

C. -282.9 kJ

D. +282.9 kJ

E. +393.3 kJ

Detailed Solution

The energy charge for the reaction is - (393 - HO.4) = -282.9 kJ
14.

Tetraoxosulphate (IV) ions are finally tested using?

A. acidified silver nitrate

B. acidified barium chloride

C. ime-water

D. dilute hydrochloric acid

E. acidified lead nitrate

B
15.

An organic compound decolourized acidified KMnO4 solution but failed to react with ammoniacal silver nitrate solution. The organic compound is likely to be?

A. a carbonxylic acid

B. an alkane

C. an alkene

D. an alkyne

E. an akanone

C
16.

Solid sodium hydroxide on exposure to air absorbs a gas and ultimately gives another alkaline substance with the molecular formula?

A. NaOH.H2O

B. NaOH.N2

C. Na2CO3O

D. NaHCO3

E. NaNO3O

C
17.

Which of the following substances is the most abundant in the universe?

A. Carbon

B. Air

C. Water

D. Oxygen

E. Hydrogen

Detailed Solution

Element Abundance
Hydrogen 40,000
Helium 3,100
Oxygen 22
Neon 8.6
Nitrogen 6.6
Carbon 3.5
Silicon 1
Magnesium 0.91
Iron 0.6
Sulfur 0.38
18.

A colourless organic compound X was burnt in excess air to give two colourless and odourless gases, Y and Z, as products. X does not decolorize blue bromine vapour, Y turns lime milky while Z gives a blue colour with copper (ll) tetraoxosulphate (IV).
Compound X is?

A. an alkene

B. an alkane

C. an alkyne

D. tetrachloromethane

E. dichloromethane

B
19.

A colourless organic compound X was burnt in excess air to give two colourless and odourless gases, Y and Z, as products. X does not decolorize blue bromine vapour, Y turns lime milky while Z gives a blue colour with copper (ll) tetraoxosulphate (IV).
Y and Z are respectively?

A. CO2 and NH3

B. CO and NH3

C. SO2 and H2O

D. CO2 and H2O

E. SO2 and NH3

Detailed Solution

All saturated hydrocarbons are attacked by oxygen at elevated temperatures and, if oxygen is in excess, complete combustion to carbon dioxide and water occurs.
20.

Which of the following compounds is NOT the correct product formed when the parent metals is heated in air?

A. Calcium oxide (CaO)

B. Sodium oxide (Na2O)

C. Copper (ll) oxide (CuO)

D. Tri-iron tetroxide (Fe3O4)

E. Aluminium oxide (Al2O3)

D