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Energy Changes - Chemistry Jamb Past Questions and Answers

Chemistry Questions And Answers On Energy Changes
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Chemistry Jamb Past Questions


Questions and Answers on Energy changes

Question 16 :



A certain industrial process is represented by the chemical equation 2A(g) + B(g) \(\to\) C(g) + 3D(g) \(\Delta\)H = X kJmol-1. Which of the following conditions will favour the yield of the products?

A. Increase in temperature, decrease in pressure
B. Increase in temperature, increase in pressure
C. Decrease in temperature,increase in pressure
D. Decrease in temperature, decrease in pressure
E. Constant in temperature, increase in pressure


Question 17 :



In the reaction H2(g)O \(\to\) H2(g) + 1/2O2(g)
ΔH = -2436000 KJ, which of the following has no effect on the equilibrium position?

A. Adding argon to the system
B. Lowering the temperature
C. Adding hydrogen to the system
D. Decreasing the pressure
E. Increasing the temperature


Question 18 :



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


Question 19 :



When marble is heated to about 1473 K, another white solid is obtained which reacts vigorously with water to give an alkaline solution. The solution contains?

A. NaOH
B. KOH
C. Mg(OH)2
D. Zn(OH)2
E. Ca(OH)2


Question 20 :



20 cm3 of 1.0 molar NH4OH solution when neutralized with 20.05cm3 of 0.1 molar HCl liberated -102 joules of heat. Calculate the heat of neutralization of NH4OH?

A. -51.O KJ mol-
B. +57.3 KJ mol-
C. +57.O KJ mol-
D. +51.0 KJ mol-






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