EASY
11th CBSE
IMPORTANT
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For exothermic reactions, the enthalpy of products is than enthalpy of reactants.

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Important Questions on Thermodynamics

MEDIUM
11th CBSE
IMPORTANT
The heat produced from the complete combustion of 1 g of fuel or food is called its_____.
HARD
11th CBSE
IMPORTANT
The allotropic form of sulphur for which the standard enthalpy of formation is taken as zero is _____.
MEDIUM
11th CBSE
IMPORTANT
Enthalpy of solution of NaCl(s) is +4 kJ mol-1 and enthalpy of hydration is -784 kJ mol-1. Lattice enthalpy of NaCl(s) will be _____ kJ mol-1 .
MEDIUM
11th CBSE
IMPORTANT
Enthalpy of solution of anhydrous CuSO4(s) and hydrated salt, CuSO4.5H2O(s) are -66.5 kJ mol-1 and +11.7 kJ mol-1 respectively. The enthalpy of hydration of CuSO4(s) is _____ kJ mol-1.
MEDIUM
11th CBSE
IMPORTANT
The bond energy of H2 is found to be 435 kJ mol-1. Therefore, the enthalpy of formation of hydrogen atom will be _____kJ mol-1.(21.75/217.5)
MEDIUM
11th CBSE
IMPORTANT
Enthalpy of dissociation of H2O molecules into H+ and OH- ions is _____ kJ mol-1.
MEDIUM
11th CBSE
IMPORTANT
For an endothermic process to be spontaneous, the factor TS should be _____ H in magnitude (equal to or less than or greater than).
MEDIUM
11th CBSE
IMPORTANT

The expression for the entropy change when a gas expands from volume V1 to volume V2 at constant temperature T is ST=_____.

A R InT2T1.B R InV2V1.C R InV1V2.

Enter your correct answer as A, B or C.