Practice free NEET NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Enthalpy is an ________property
Enthalpy is an extensive property. Extensive properties depend on the amount of matter in a sample. Since enthalpy is proportional to the amount of substance, it is classified as an extensive property.
Select the correct set of statements/s : I . Work done by the surrounding in case of infinite stage expansion is more than single stage expansion II . Irreversible work is always greater than reversible work III . On an ideal gas in case of single stage expansion and compression system as well as surrounding are restored back to their original states IV . If gas is in thermodynamic equilibrium is taken from state A to state B , by four successive single stage expansions,. Then we can plot 4 points on the P-V indicator diagram
Hess Law of Heat summation includes
Hess's Law of Heat Summation states that the total enthalpy change of a reaction is the same, regardless of the number of steps the reaction is carried out in. Thus, it includes both the initial reactants and final products. This implies that the enthalpy change is dependent on the initial and final states of the reactants and products.
Ice - Water mass ratio is maintained as 1:1 in a given system containing water in equilibrium with ice at constant pressure. If CP (ice) = CP (water) = 4.18 J $mol ^ {-1} K^ {-1} $ molar heat capacity of such a system is
During winters , moisture condenses in the form of dew and can be seen on plant leaves and grass. The entropy of the system in such cases decreases as liquids possess lesser disorder as compared to gases. With reference to the second law, which statement is correct , for the above process ?
As dew formation is spontaneous process therefore entropy or
randomness of the universe will increase. As randomeness of the
system has decreased but randomness of the surrounding will
increase larger so that change is positive.
The enthalpy change for a given reaction at $ 298 K is – x J mol^{–1} $ (x being positive). If the reaction occurs spontaneously at 298 K, the entropy change at that temperature
It I is because of the fact that for spontaneity, the value of OG = (OH – TOS) should be $ \lt 0 $ . If OS is – ve, the value of TOS shall have to be less than OH or the value of OS has to be less than that of x
Spontaneous adsorption of a gas on a solid surface is exothermic process because
Spontaneous adsorption of a gas on a solid surface is exothermic because it leads to a decrease in the entropy of the system. The gas molecules lose their freedom of movement when they get adsorbed onto the solid surface, leading to a decrease in entropy.
Identify the correct statement regarding entropy :
According to the third law of thermodynamics, at absolute zero (0 K), the entropy of a perfectly crystalline substance is zero. This is because a perfectly crystalline substance at absolute zero has only one possible microstate, leading to zero entropy.
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
Ready to ace NEET?
Free access · No credit card required
Yes. You can attempt every NEET question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.
No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.
The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.