Among the following, the reaction for which $∆H=∆E$ is-

1. $PC{l}_{5}\left(g\right)\to PC{l}_{3}\left(g\right)+C{l}_{2}\left(g\right)$

2. ${H}_{2}\left(g\right)+C{l}_{2}\left(g\right)\to 2HCl\left(g\right)$

3. ${C}_{2}{H}_{5}OH\left(l\right)+3{O}_{2}\left(g\right)\to 2C{O}_{2}\left(g\right)+3{H}_{2}O\left(l\right)$

4. ${C}_{2}{H}_{4}\left(g\right)+{H}_{2}\left(g\right)\to {C}_{2}{H}_{6}\left(g\right)$

Concept Questions :-

First Law of Thermodynamics
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

For which change $∆H\ne ∆E$

1. ${H}_{2}+{I}_{2}⇌2HI$

2. $HCl+NaOH\to NaCl+{H}_{2}O$

3. $C\left(s\right)+{O}_{2}\left(g\right)⇌C{O}_{2}\left(g\right)$

4. ${N}_{2}+3{H}_{2}\to 2N{H}_{3}$

Concept Questions :-

Enthalpy and It's Type
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Difficulty Level:

Enthalpy change when 1.00 g water is frozen at ${0}^{\circ }C,$ is :

1. 0.0797 kcal

2. -0.0797 kcal

3. 1.435 kcal

4. -1.435 kcal

Concept Questions :-

Enthalpy and It's Type
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Difficulty Level:

One mole of hydrogen gas at ${25}^{\circ }C$ and 1 atm pressure is heated at constant pressure until its volume has doubled. Given that ${C}_{v}$ for hydrogen is 3.0 cal deg-1 mol-1, the and $∆E$ for this process are-

1. = 1490 cal and $∆E$ = 894 cal

2. $∆E$= 1490 cal

3. = 894 cal and $∆E$= 1490 cal

4. $∆E$= 894 cal

Concept Questions :-

CP and CV and Relation for Real Gas
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The enthalpy change of the reaction

$A{l}_{2}C{l}_{6}\left(s\right)+6Na\left(s\right)\to 2Al\left(s\right)+6NaCl\left(s\right)$ is -257 kcal.

Given the heat of formation of NaCl(s) is 98.0 kcal, the heat of formation of $A{l}_{2}C{l}_{6}\left(s\right)$ is-

1. 158 kcal

2. -331 kcal

3. -166 kcal

4. 316 kcal

Concept Questions :-

Thermochemistry
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Difficulty Level:

Some of the thermodynamic parameters are state variables while some are process variables. Some grouping of the parameters are given. Choose the correct one-

1. State variables : Temperature, No. of moles

Process variables : Internal energy, work done by the gas

2. State variables : Volume, Temperature

Process variables : Internal energy, work done by the gas

3. State variables : work done by the gas, heat rejected by the gas.

Process variables : Temperature, volume

4. State variables : Internal energy, volume

Process variables : Work done by the gas, heat absorbed by the gas

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

One mole of a real gas is subjected to heating at constant volume from state to  state. Then it is subjected to irreversible adiabatic compression against constant external pressure of P3 atm till syatem reaches the final state. If the constant volume molar heat capacity of real gas is CV. Find out correct expression for $∆H$ from state 1 to state 3-

1. ${C}_{v}\left({T}_{3}-{T}_{1}\right)+\left({P}_{3}{V}_{1}-{P}_{1}{V}_{1}\right)$

2. ${C}_{v}\left({T}_{2}-{T}_{1}\right)+\left({P}_{3}{V}_{2}-{P}_{1}{V}_{1}\right)$

3. ${C}_{v}\left({T}_{2}-{T}_{1}\right)+\left({P}_{3}{V}_{1}-{P}_{1}{V}_{1}\right)$

4. ${C}_{p}\left({T}_{2}-{T}_{1}\right)+\left({P}_{3}{V}_{1}-{P}_{1}{V}_{1}\right)$

Concept Questions :-

CP and CV and Relation for Real Gas
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The heat evolved in the combustion of 112 litres of water gas(mix of equal volumes of H2 and CO)

1. 241.8 kJ

2. 283 kJ

3. 1312 kJ

4. 1586 kJ

Concept Questions :-

Thermochemistry
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In which case of mixing of a strong acid and a base, each of 1(N) concentration, temperature-increase is the highest ?

1. 20 ml acid and 30 ml alkali

2. 10 ml acid and 40 ml alkali

3. 25 ml acid and 25 ml alkali

4. 35 ml acid and 15 ml alkali

Concept Questions :-

Thermochemistry
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The heats of neutralisation of four acids A, B, C and D are -13.7, -9.4, -11.2 and -12.4 kcal respectively when they are neutralised by a common base. The acidic character obeys the order :

1. A>B>C>D

2. A>D>C>B

3. D>C>B>A

4. D>B>C>A

Concept Questions :-

Hess's Law