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JAMB Chemistry Past Questions & Answers - Page 94

466.

The Avogadro number of 24g of magnesium is the same as that of

1g of hydrogen molecules

16g of oxygen molecules

32g of oxygen molecules

35.5g of chlorine molecules

View answer & explanation

Correct answer is C

24mg = 1 mole of magnesium and

32g of O₂ = mole of O₂

467.

CO(g) + H2O(g) $\to$ $CO_{2g}$ + H2(g) $\Delta$ H = -4100J. Which of the following factors favour the formation of hydrogen in the above reaction? i. high pressure. ii. low pressure iii. high-temperature iv. use of excess steam

i, iii and iv

iii only

ii, iii and i

iv only

View answer & explanation

Correct answer is D

i, ii will have no effect because the number of mole of reactants(volume) is equal to the number of mole of the product(volume) and iii will also have no effect since the forward reaction which favours the production of hydrogen is exothermic, therefore, the production of hydrogen will be favored by iv only.

468.

The nucleus of the isotopes tritium,contains

two neutrons with no protons

one neutron and one proton

two neutrons and one proton

two neutrons, one proton and one electron

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

469.

A given mass of gas occupies 2 dm² at 300k. At what temperature will its volume be doubled keeping the pressure constant?

400k