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Chemical Thermodynamics Chemistry - Chemical Thermodynamics

Maharashtra Board - STD 12 - Chemistry (MSBSHSE - Semi English Medium). 301 questions in this chapter.

Question types

Chemical Thermodynamics question types

301 questions across 4 question groups — pick any mix to generate a Chemistry paper with step-by-step answer keys.

301
Questions
4
Question groups
5
Question types
Sample Questions

Chemical Thermodynamics questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1MCQ1 Mark
If a system absorbs $30 kJ$ of heat and perform $12 kJ$ of work on the surrounding. What is the increase in internal energy of the system?
  • A
    2.5 kJ
  • B
    42 kJ
  • C
    360 kJ
  • ✓
    18 kJ

Answer: D.

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Q 2MCQ1 Mark
Identify the process having $\Delta V=0$
  • A
    Isothermal
  • ✓
    Isochoric
  • C
    Isobaric
  • D
    Adiabatic

Answer: B.

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Q 3MCQ1 Mark
An ideal gas is allowed to expand from $2 dm ^3$ to $6 \times 10^{-3} m ^3$ against a $c$ external pressure of $1 bar$. The work done in $kJ$ is
  • A
    -4.0 kJ
  • ✓
    -0.4 kJ
  • C
    -6.0 kJ
  • D
    -2 kJ

Answer: B.

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Q 4MCQ1 Mark
An ideal gas is compressed from a volume of $1 m ^3$ to $5 dm ^3$ at a pressure of 0.2 bar. What is the value of work done by the gas during compression?
  • A
    201.0kj
  • B
    190kj
  • C
    497kj
  • ✓
    19.90kj

Answer: D.

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Q 5MCQ1 Mark
Calculate $\Delta U$ if $2 kJ$ heat is released and $10 kJ$ of work is done on the system.
  • A
    20kj
  • B
    5kj
  • ✓
    8kj
  • D
    12kj

Answer: C.

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Q 13Answer the following in brief.3 Marks
State whether $\Delta S$ is positive, negative or zero for the following reactions.
i. $2 H _{2(g)}+ O _{2(g)} \rightarrow 2 H _2 O _{( l )}$
ii. $CaCO _{3(s)} \rightarrow CaO _{( s )}+ CO _{2(g)}$
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Q 14Answer the following in brief.3 Marks
Given the thermochemical equation,
$C _2 H _{2( g )}+\frac{5}{2} O _{2( g )} \rightarrow 2 CO _{2( g )}+ H _2 O _{( l )}, \Delta_{ r } H ^0=-1300 kJ$
Write thermochemical equations when
i. Coefficients of substances are multiplied by $2.$
ii. equation is reversed.
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Q 17Answer the following in detail.4 Marks
The enthalpy change for the reaction, $C2H4(g) + H2(g) \rightarrow C2H6(g) is -620 J$ when $100\ ml$ of ethylene and $100\ mL$ of $H2$ react at $1$ bar pressure. Calculate the pressure volume type of work and $\triangle U$ for the reaction.
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Q 18Answer the following in detail.4 Marks
Calculate the total heat required $(a)$ to melt $180\ g$ of ice at $0^{\circ} C$, (b) heat it to $100^{\circ} C$ and then (c) vapourise it at that temperature. Given $\Delta$ fusH $H ($ice$) =6.01\ kJ\ mol-1$ at $0^{\circ} C , \Delta vapH ( H 2 O )=40.7\ kJ\ mol\ -1$ at $100^{\circ} C$ specific heat of water is $4.18 J g -1 K-1$.
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Q 19Answer the following in detail.4 Marks
Calculate ∆H0 for the following reaction at 298 K
$H_2B_4O_{7(s)} + H_2O_{(l)} \rightarrow 4HBO_{2(aq)}$
i. $2H_3BO_{3(aq)} \rightarrow B_2O_{3(s)} + 3H_2O_{(l)}, \triangle H^0 = 14.4 kJ mol^{-1}$​​​​​​​
ii. $H_3BO_{3(aq)} \rightarrow HBO_{2(aq)} + H_2O_{(l)}, \triangle H^0 = -0.02 kJ mol^{-1}$​​​​​​​
iii. $H_2B_4O_{7(s)} \rightarrow 2B_2O_{3(s)} + H_2O_{(l)}, \triangle H^0 = 17.3 kJ mol^{-1}​​​​​​​$​​​​​​​
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Q 20Answer the following in detail.4 Marks
Calculate the standard enthalpy of formation of $CH _3 OH _{(l)}$ from the following data:
i. $CH _3 OH _{( l )}+\frac{3}{2} O _{2( g )} \rightarrow CO _{2( g )}+2 H _2 O _{( l )}, \Delta H ^0=-726 kJ mol ^{-1}$
ii. C (Graphite) $+ O _{2( g )} \rightarrow CO _{2( g )} \Delta_{ c } H ^0=-393 kJ mol ^{-1}$
iii. $H _{2( g )}+\frac{1}{2} O _{2( g )} \rightarrow H _2 O _{( l )}, \Delta_{ f } H ^0=-286 kJ mol ^{-1}$
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