Energy required to break hydrogen molecules is
105 k Cal / mol
104 k Cal / mol
103 k Cal / mol
107 k Cal / mol
The reactants used during photosynthesis
H2O & CO2
CO & H2O
O2 & CO2
H2O &H2
During the formation of SO3, amount of energy released is
22,000 cal
23, 000 cal
13,540 cal
54,000 cal
A chemical reaction in which heat is liberated is called
exothermic reactions
endothermic reactions
decomposition
combination
The value of internal energy depends on
nature of bond
nature of molecules
chemical structure and state of substance
bond energy
During photosynthesis, plants synthesis one of the following
Carbondioxide
Hydrogen
Starch
Protein
Molecules react with oxygen in air to provide heat, light and smoke. This reaction is
Exothermic
Endothermic
Combustion
Displacement
The energy released when a new bond is formed is called
bond enthalpy
bond dissociation energy
bond dissipation
When barium hydroxide and ammonium chloride are mixed in a glass of water, the temperature of the system
falls rapidly
raises slowly
remains same
increases rapidly
Formation of ammonia is a
exothermic
endothermic
combustion
displacement reaction
