JAMB Past Questions and Answers - Page 1589

7,941.

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

View answer & explanation

Correct answer is C

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

7,942.

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

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

7,943.

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

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

7,944.

Which of the following is used in the manufacture of bleaching powder?

A.

Sulphur dioxide

B.

Chlorine

C.

Hydrogen tetraoxosulphate (VI)

D.

Hydrogen sulphide

E.

Nitrogen dioxide

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

7,945.

Complete hydrogenation of ethyne yields?

A.

benzene

B.

methane

C.

ethane

D.

ethene

E.

propane

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.


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