Jamb Chemistry Past Questions For Year 2015

Question 51

The principal constituent of natural gas is

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• A. methane
• B. ethane
• C. propane
• D. Butane

Question 52

Chlorine consisting of two isotope of mass number 35 and 37 in the ratio 3:1 has an atomic mass of 35.5. Calculate the relative abundance of the isotope of mass number 37

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• A. 20
• B. 25
• C. 60
• D. 75

Question 53

Chlorine gas turns damp starch-iodide paper

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• A. pink
• B. colourless
• C. red
• D. dark blue

Question 54

N₂O_4(g)→ 2NO_2(g)

In the endothermic reaction above, more products formed will be favored by

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• A. A constant values
• B. an increase in pressure
• C. a decrease pressure
• D. a decrease volume

Question 55

When steam is passed over red hot carbon the substances produced are

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• A. hydrogen and trioxocarbonate (IV) acid
• B. hydrogen, oxygen and carbon (IV) oxide
• C. hydrogen and carbon (ii) oxide
• D. hydrogen and carbon (IV) oxide