Practice free Chemical Thermodynamics (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Identify the correct statement regarding a spontaneous process :
In an isolated system, there is no exchange of energy or matter between the system and surrounding. For a spontaneous process in an isolated system, the change in entropy is positive, i.e. $ OS \gt 0 $
OS will be highest for the reaction
The spontaneous flow of heat is always
The spontaneous flow of heat is always unidirectional from higher temperature to lower temperature. This is in accordance with the second law of thermodynamics, which states that heat naturally flows from a hot object to a cooler one until thermal equilibrium is reached.
The occurrence of a reaction is impossible if
Identify the correct statement regarding entropy
According to the third law of thermodynamics, the entropy of a perfectly crystalline substance is zero at absolute zero temperature (0 Kelvin). This is because a perfectly crystalline substance has a single microstate at absolute zero, leading to zero entropy.
A container has hydrogen and oxygen mixture in ratio of 4 : 1 by weight, then
When hydrogen and oxygen are mixed, the number of possible microstates increases, leading to an increase in entropy. Entropy is a measure of disorder, and mixing two different gases increases the disorder of the system.
The second law of thermodynamics says that in cyclic process.
The second law of thermodynamics states that heat cannot be completely converted into work in a cyclic process. There will always be some waste heat that is not converted into work, which is why perpetual motion machines of the second kind are impossible.
A heat engine absorbs heat $Q_1$ at temperature $T_1$ and heat $Q_2$ at temperature $T_2$. Work done by the engine is $(Q_1 + Q_2)$ . This data
The molar neutralization heat for and as compared to molar neutralization heat of NaOH and HCl
The molar heat of neutralization is the heat change that occurs when one mole of water is formed from the reaction of an acid and a base. For strong acids and bases like NaOH and HCl, the molar heat of neutralization is typically constant at about -57.1 kJ/mol because they fully dissociate in water. Thus, the molar neutralization heat is equal for strong acid and base combinations.
If the enthalpy of B is greater than of A, the reaction $ A \rightarrow B $ is
An endothermic reaction is one that absorbs energy from its surroundings, typically in the form of heat. If the enthalpy of B is greater than that of A, it means the reaction $A ightarrow B$ requires an input of energy, making it an endothermic reaction.
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