The temperature of 5 ml of a strong acid increases by ${5}^{\circ }$ when 5 ml of a strong base is added to it. If 10 ml of each is mixed, temperature should increase by-

1. ${5}^{\circ }$

2. ${10}^{\circ }$

3. ${15}^{\circ }$

4. cannot be known

Concept Questions :-

Thermochemistry
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The heat of neutralisation of HCl by NaOH is -55.9 kJ/mole. If the heat of neutralisation of HCN by NaOH is -12.1 kJ/mole, then energy of dissociation of HCN is-

1. -43.8 kJ

2. 43.8 kJ

3. 68 kJ

4. -68 kJ

Concept Questions :-

Hess's Law
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

For a reaction at equilibrium-

1. $∆G=∆{G}^{\circ }=0$

2.

3.

4. $∆G=∆{G}^{\circ }\ne 0$

Concept Questions :-

Gibbs Energy Change
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Using only the following data:

(I)

(II)

the $∆{H}^{\circ }$ value, in kilojoules, for the reaction

$F{e}_{2}{O}_{3}\left(s\right)+CO\left(g\right)\to 2FeO\left(s\right)+C{O}_{2}\left(g\right)$ is calculated to be:

1. -43.3

2. -10.3

3. +6.2

4. +10.3

Concept Questions :-

Enthalpy and It's Type
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

82 litres of carbon dioxide are produced at a pressure of 1 atm by the action of acid on a metal carbonate. The work done by the gas (in calories) in pushing back the atmosphere is (R = 0.082 litre-atm deg-1mol-1)

1. 1000

2. 820

3. 1640

4. 2000

Concept Questions :-

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

Difficulty Level:

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
High Yielding Test Series + Question Bank - NEET 2020

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
High Yielding Test Series + Question Bank - NEET 2020

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