NEET Enthalpy & Internal energy Practice Questions With Solutions

NEET Chemistry Enthalpy & Internal energy Practice Questions

Question 1.

Enthalpy of combustion of carbon to carbon dioxide is \(-390.0~\text{kJ mol}^{-1}.\) The amount of heat released when \(35.0~\text{g}\) of \(\mathrm{CO_2}\) is formed from the reaction of carbon and dioxygen gas, is:

A\(310~\text{kJ}\)

B\(490~\text{kJ}\)

C\(245~\text{kJ}\)

D\(700~\text{kJ}\)

Question 2.

For the following reaction at 300K \(\mathrm{A}_2(\mathrm{~g})+3 \mathrm{~B}_2(\mathrm{~g}) \rightarrow 2 \mathrm{AB}_3(\mathrm{~g})\) the enthalpy change is +15 kJ, then the internal energy change is:

A19.98 K J

B200 J

C1999 J

D1.9988 kJ

Question 3.

For the reaction, 2Cl(g)

\to

Cl₂(g), the correct option is:

A

∆_{r} H > 0 and ∆_{r} S < 0

B

∆_{r} H < 0 and ∆_{r} S > 0

C

∆_{r} H < 0 and ∆_{r} S < 0

D

∆_{r} H > 0 and ∆_{r} S > 0

Question 4.

The standard enthalpy of vaporization

∆_{vap} H^{o}

for water at 100 ^oC is 40.66 kJ mol^–1. The internal energy of vaporization of water at 100 ^oC (in kJ mol^–1) is:
(Assume water vapour behaves like an ideal gas.)

A+37.56

B-43.76

C+43.76

D+40.66

Question 5.

Given the following reaction: \(4H(g)\)→ \(2 H_{2}\)\((g)\) The enthalpy change for the reaction is -869.6 kJ. The dissociation energy of the H-H bond is:

A-869.6 kJ

B+434.8kJ

C+217.4kJ

D-434.8 kJ

Question 6.

The difference between enthalpy (∆H) and internal energy (∆E) for the given below reaction,
under constant temperature, is:
\(C_{3} H_{8} \left(\right. g \left.\right) + 5 O_{2} \left(\right. g \left.\right) \rightarrow 3 CO_{2} \left(\right. g \left.\right) + 4 H_{2} O \left(\right. l \left.\right)\)

A+ RT

B– 3RT

C+ 3RT

D– RT

Question 7.

The enthalpy of \(CH_4 + \dfrac{1}{2 }O_2 \rightarrow\ CH_3OH\)

is negative. If enthalpy of combustion of methane and \(CH_3OH\) are x and y, respectively, then which of the following relations is correct?

Ax > y

Bx < y

Cx = y

Dx ≥ y

Question 8.

For the reaction
C₂H₅OH(l) + 3O₂(g) →2CO₂(g) + 3H₂O(l) which one is true:

A∆H = ∆E – RT

B∆H = ∆E + RT

C∆H = ∆E + 2RT

D∆H = ∆E – 2RT

Question 9.

If a system is expanded under adiabatic process, then:

ATemperature increases

B∆E decreases

C∆E increases

DNone of the above

Question 10.

Which of the following statements is true for a reaction where all the reactants and products are in the liquid phase?

A∆H = ∆E

B∆H = ∆W

C∆H > ∆E

DNone of the above

Question 1.

Which of the following statements are true for a cyclic process?

AW = 0

B∆E = 0

C∆H = 0

D∆E ≠ 0

NEET Enthalpy & Internal energy Practice Questions With Solutions

NEET Chemistry Enthalpy & Internal energy Practice Questions

Question 1.

Question 2.

Question 3.

Question 4.

Question 5.

Question 6.

Question 7.

Question 8.

Question 9.

Question 10.

Question 1.

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