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Thermochemistry - 2
1.
The study of heat changes accompanying a chemical reaction is known as ………………
a) Enthalpy of formation
b) Thermo-chemistry
c) Structures,bonding
d) Bomb Calorimeter
2.
Which one of the following equations correctly defines the enthalpy change of formation of carbon monoxide.
a) C(s)+ ½ O
2
(g) CO(g)
b) C(s)+ O(g) CO(g)
c) C(s) + CO
2
(g) 2CO(g)
d) C(s)+ ½ O
2
(g) CO(g)
3.
Which one of the following is involved in determining the enthalpy change in a chemical reaction.
a) The initial and final states of the reacting system.
b) The activation energy of the reaction.
c) The mechanism of the reaction.
d) The No. of stages involved in the chemical reaction.
4.
The standard enthalpy changes of formation of carbon dioxide and water are –394 KJ mol
-1
and –286 KJ mol
-1
respectively., If the standard enthalpy change of combustion of propyne, C
3
H
4
is –1938 KJ mol
-1
. What is its standard enthalpy change of formation.
a) +184 KJ mol
-1
b) –184 KJ mol
-1
c) + 1258 KJ mol
-1
d) –680 KJ mol
-1
5.
Which one of the following has the same value as the standard enthalpy change of formation of carbun monoxide.
a) ½ H0c (graphite)
b) H0(CO
2
)- ½ H0c (graphite)
c) H0c (graphite)- H0c(CO)
d) ½ H0f (CO
2
)
6.
The enthalpy changes of formation of gaseous ethene and gaseous ethane are 52KJ mole
-1
and –85 KJ mole
-1
respectively at 298K. What is the enthalpy change of reaction at 298 for the following process?
a) -33KJ mol
-1
b) +33 KJ mol
-1
c) -137 KJ mol
-1
d) 137 KJ mol
-1
7.
For which of the following ions is the enthalpy change of hydration likely to be the most exothermic?
ION IOIC RADIUS CHARGE ON ION
a) 0.169 +1
b) 0.095 +1
c) 0.065 +2
d) 0.135 +2
8.
breaking of bond
a) Sum of KE & potential energy
b) Energy is absorbed
c) Exothermic
d) Binding forces
9.
Combustion
a) Sum of KE & potential energy
b) Exothermic
c) Binding forces
d) Energy is absorbed
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