NEET Thermochemistry Practice Questions With Solutions

NEET Chemistry Thermochemistry Practice Questions

Question 1.

The standard heat of formation, in kcal/mol of \(Ba^{2+}\) is : [Given : standard heat of formation of \(SO^{2-}_4\) ion (aq) \(= -216~ \text{kcal/mol}\), standard heat of crystallisation of \(BaSO_4 (s)= -4.5~\text{ kcal/mol,}\) standard heat of formation of \(BaSO_4 (s)= -349 ~\text{kcal/mol]}\)

A\(+133.0 \)

B\(+220.5\)

C\(-128.5 \)

D\(-133.0\)

Question 2.

Consider the following reaction:
\(\mathrm{2H_2(g) + O_2(g) \rightarrow 2H_2O(g); ~\Delta_rH^\circ = -483.64~ kJ }\)

What is the enthalpy change (in KJ) for the decomposition of one mole of water?

A120.9

B241.82

C18

D100

Question 3.

At standard conditions, if the change in the enthalpy for the following reaction is –109 kJ mol^–¹
H_2(g)+Br_2(g)

\to

2HBr_(g)and the bond energy of H₂ and Br₂ is 435 kJ mol^–1 and 192 kJ mol^–1respectively, what is the bond energy (in kJ mol^–1) of HBr?

A368

B736

C518

D259

Question 4.

The heat of combustion of carbon to CO₂ is –393.5 KJ/mol. The heat released upon the formation of 35.2 g of CO₂ from carbon and oxygen gas is:

A–315 KJ

B+315 KJ

C–630 KJ

D+630 KJ

Question 5.

The enthalpy of fusion of water is 1.435 kcal/mol. The molar entropy change for the melting of ice at 0 ^oC is:

A10.52 cal/(mol K)

B21.04 cal/(mol K)

C5.260 cal/(mol K)

D0.526 cal/(mol K)

Question 6.

Consider the following reactions:

AH⁺(aq) + OH^-(aq) → H₂O(l)
ΔH = -x₁ kJmol^-1

BH₂(g) + 1/2O₂(g) → H₂O(l)
ΔH = -x₂ kJmol^-1

CCO₂(g) + H₂(g) → CO (g) + H₂O(l)
ΔH = -x₃ kJmol^-1

DC₂H₂(g) + 5/2O₂(g) → 2CO₂+ H₂O(l)
ΔH = -x₄ kJmol^-1

Question 7.

The bond energy of H—H and Cl-Cl is 430 kJ
mol^-1 and 240 kJ mol^-1 respectively and ΔH_f for HCl is -90 kJ mol^-1. The bond enthalpy of HCl is:

A290

k J

m o l^{- 1}

B380

k J

m o l^{- 1}

C425

k J

m o l^{- 1}

D245

k J

m o l^{- 1}

Question 8.

The enthalpy of combustion of H₂, cyclohexene (C₆H₁₀) and cyclohexane (C₆H₁₂) are -241, -3800 and -3920 kJ per mol respectively. Heat of hydrogenation of cyclohexene is:

A-121 kJ per mol

B+121 kJ per mol

C+242 kJ per mol

D-242 kJ per mol

Question 9.

If the bond energies of H–H, Br – Br, and H –Br are 433, 192, and 364 kJ mol^–1 respectively, the ∆Hº for the reaction H₂(g) + Br₂(g) → 2HBr(g) will be:

A+103 kJ

B+261kJ

C–103 kJ

D–261 kJ

Question 10.

For which one of the following equations is

∆ H °_{reaction}

equal to

∆ H °_{formation}

for the product:

AN₂(g) + O₃(g) → N₂O₃(g)

BCH₄(g) + 2Cl₂(g) → CH₂Cl₂(l) + 2HCl(g)

CXe(g) + 2F₂(g) → XeF₄(g)

D2CO(g) + O₂(g) → 2CO₂(g)

Question 1.

Heat of combustion ∆Hº for C(s), H₂(g) and CH₄(g) are – 94, – 68 and – 213 Kcal/mol. ∆Hº for C(s) + 2H₂(g) → CH₄ (g) is:

A– 17 Kcal

B– 111 Kcal

C– 170 Kcal

D– 85 Kcal

NEET Thermochemistry Practice Questions With Solutions

NEET Chemistry Thermochemistry 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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