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Energy changes - Jamb Chemistry Past Questions and Answers

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Jamb Chemistry Past Questions

Jamb Past Questions and Answers on Energy changes

Question 61:


NH3(g) + HCl(s) → NH4Cl(s)
The entropy change in the system above is

A. Positive
B. Zero
C. Negative
D. Indeterminate


Question 62:


Which of the following reaction is endothermic?

A. C(s) + O2(g) → CO2(g)
B. CaO(s) + H2O(l) → Ca(OH)2(s)
C. C(s) + H2O(g) → CO(g) + H2(g)
D. HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)


Question 63:


C(s) + H2O(g) → H2(g) + CO2(g)
ΔG for the reaction above at 1300k is -43KJ. At this temperature, the reaction is

A. Not feasible
B. At equilibrium
C. Feasible
D. Exothermic


Question 64:


Two equal bulbs, one containing ammonia and the other nitrogen are opened mouth - to - mouth to each other at room temperature. The entropy in the mixture of gases is likely to

A. Remain unchange
B. Increase
C. Decrease
D. Change


Question 65:


One of the products of the thermal decomposition of sodium trioxonitrate (V) is

A. Sodium
B. Nitrogen
C. Sodium dioxonitrate (III)
D. Sodium oxide






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