Spontaneity Of Reactions Jamb Chemistry Past Questions

Question 1

NH_3(g) + HCl_(s) → NH ₄Cl _(s)

The entropy change in the system above is

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• A. positive
• B. zero
• C. negative
• D. intermediate

Question 2

An endothermic reaction is one during which heat is.....and can be represented by the symbol.... which of the following combinations can be used accurately to complete the above definition?

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• A. liberated, -\(\Delta\)H
• B. liberated, +\(\Delta\)H
• C. absorbed, -\(\Delta\)H
• D. absorbed, +\(\Delta\)H
• E. absorbed, +\(\Delta\)G

Question 3

When ΔH is negative, a reaction is said to be

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• A. endothermic
• B. exothermic
• C. reversible
• D. ionic

Question 4

X(g) + 3Y(g) ---- 2z(g) H = +ve. if the reaction above takes place at room temperature, the G will be

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• A. negative
• B. zero
• C. positive
• D. indeterminate

Question 5

What volume of oxygen will remain after reacting 8cm\(^3\) of hydrogen gas with 20cm\(^3\) of oxygen gas

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• A. 10cm\(^3\)
• B. 12cm\(^3\)
• C. 14cm\(^3\)
• D. 16cm\(^3\)