Thermodynamics practice · Medium

Identify the correct statement from the
following is a chemical reaction.

In biological cells that have a plentiful supply of $\mathrm{O}_2,$ glucose is oxidized completely to $\mathrm{CO}_2$ and $\mathrm{H}_2 \mathrm{O}$ by a process called aerobic oxidation. Muscle cells may be deprived of $\mathrm{O}_2$ during vigorous exercise and in that case, one molecule of glucose is converted to two molecules of lactic acid, $\mathrm{CH}_3 \mathrm{CH}(\mathrm{OH}) \mathrm{COOH},$ by a process called anaerobic glycolysis.

$\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6(\mathrm{s})+6 \mathrm{O}_2(\mathrm{g}) \rightarrow 6 \mathrm{CO}_2(\mathrm{g})+6 \mathrm{H}_2 \mathrm{O}({l}) ; \Delta H^{\circ}=-2880 \mathrm{~kJ} / \mathrm{mol}$

$\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6(\mathrm{s}) \rightarrow 2 \mathrm{CH}_3 \mathrm{CH}(\mathrm{OH}) \mathrm{COOH}(\mathrm{s}) ; \Delta H^{\circ}=+2530 \mathrm{~kJ} / \mathrm{mol}$

Which of the following statements is true regarding aerobic oxidation and anaerobic glycolysis with respect to energy change as heat?

Following reaction occurs in an automobile $2{C_8}{H_{18}}(g) + 25\,{O_2}(g) \to 16\,C{O_2}(g) + 18{H_2}O(g)$ The sign of $\Delta H,\,\Delta S\mathrm{ }\,\mathrm{and}\,\,\mathrm{ }\Delta G$ would be

In which of the following changes entropy
decreases ?

If heat of dissociation of ${CHCl}_2{COOH}$ is $0.7 \mathrm{~Kcal} / \mathrm{mol}$ then $\Delta {H}$ for the reaction:

${CHCl}_2 {COOH}+{KOH} \rightarrow {CHCl}_2 {COOK}+{H}_2 {O}$

The enthalpy of vaporization of substance is $840 \mathrm{~J-} \mathrm{mol}^{-1}$ and its boiling point is $-173^{\circ} \mathrm{C}$. Its entropy of vaporization is:

What is the entropy change $(in J{K^{ - 1}}mo{l^{ - 1}})$ when one mole of ice is converted into water at 0℃? (The enthalpy change for the conversion of ice to liquid water is 6.0 kJ mol^(-1) at 0℃)

Assertion : The mass and volume of a substance are the extensive properties and are proportional to each other.

Reason : The ratio of mass of a sample to its volume is an intensive property.

$\mathrm{C}_{\mathrm{v}}$ for monatomic gas is

Read the following statements carefully and choose the correct option

(i) The state of the system is specified by state functions or state variables.

(ii) Variables like $\mathrm{P}, \mathrm{V}$ and $\mathrm{T}$ are called state variables or state functions

(iii) Their values depend only on the state of the system and not on how it is reached.

The heat of neutralization of ${NaOH}$ with ${HCl}$ is $57.3 {~kJ}$ and with ${HCN}$ is $12.1 {~kJ}$. The heat of ionization of ${HCN}$ is

Which selection correctly shows units for specific heat capacity?

Given, $\mathrm{H}_2 \mathrm{O}(l) \rightarrow \mathrm{H}_2 \mathrm{O}(\mathrm{g}) ; \Delta \mathrm{H}_1=+43.7 \mathrm{~kJ}$ $\mathrm{H}_2 \mathrm{O}(\mathrm{s}) \rightarrow \mathrm{H}_2 \mathrm{O}(l) ; \Delta \mathrm{H}_2=+6.05 \mathrm{~kJ}$ Calculate the enthalpy of sublimation of ice.

Assertion : Heat absorbed in a reaction at constant temperature and constant volume is $-\Delta G$.

Reason : $\Delta G$ should be negative for the reaction to be spontaneous.

At $27^{\circ} \mathrm{C}$ latent heat of fusion of a compound is $2930 \mathrm{~J} / \mathrm{mol}$. Entropy change is

During isothermal expansion of one mole of an ideal gas from $10 {~atm}$ to $1 {~atm}$ at $273 {~K}$, thework done is (gas constant $=2$ ) :

A gas expands against a variable pressure given by $P=\frac{20}{V}$ (where $P$ in atm and $V$ in $\mathrm{L}$ ). During expansion from volume of 1 litre to 10 litre, the gas undergoes a change in internal energy of $400 \mathrm{~J}$. How much heat is absorbed by the gas during expansion?

At $298 \mathrm{~K}$ what will be the change in standard internal energy change for the given reaction $\mathrm{OF}_2(\mathrm{~g})+\mathrm{H}_2 \mathrm{O}(\mathrm{g}) \rightarrow \mathrm{O}_2(\mathrm{~g})+2 \mathrm{HF}(\mathrm{g}) ;$

Work done in reversible adiabatic process is given by:

For an isothermal reversible expansion process, the value of $q$ can be calculated by the expression

At $27^{\circ} \mathrm{C}$ the reaction, ${C}_6 {H}_{6}({l})+15 / 2 {O}_{2}({g}) \rightarrow 6 {CO}_{2}({g})+3 {H}_2 {O}{({l})}$ proceeds spontaneously because the magnitude of

In an isobaric process, when temperature change from $\mathrm{T}_1$ to $\mathrm{T}_2, \Delta \mathrm{S}$ is equal to:

An ideal monoatomic gas initially at $300 \mathrm{~K}$ expands adiabatically into vacuum to double its volume. The final temperature of gas is

Choose the reaction in which $\Delta {H}$ is not equal to $\Delta {U}$ ?

Which of the following represents the first law
of thermodynamics

For the reaction $2Cl\left( g \right) \to C{l_2}\left( g \right),$ the signs of $\Delta H$ and $\Delta S$ respectively are

$1 \mathrm{~g~H}_2$ gas at S.T.P. is expanded so that volume is doubled. Find the work done in Joules. (1 litre atm = $101.3 \mathrm{~J}$)

Considering entropy(s) as the thermodynamic parameter, the criterion for the spontaneity of any process is:

The standard molar enthalpies of formations of $\mathrm{H}_2 \mathrm{O}({l})$ and $\mathrm{H}_2 \mathrm{O}_2({l})$ are $-286$ and $-188 \mathrm{~kJ} / \mathrm{mol},$ respectively. Molar enthalpies of vaporization of $\mathrm{H}_2 \mathrm{O}$ and $\mathrm{H}_2 \mathrm{O}_2$ are $44$ and $53 \mathrm{~kJ},$ respectively. The bond dissociation enthalpy of $\mathrm{O}_2(\mathrm{g})$ is $498 \mathrm{~kJ} / \mathrm{mol}.$ Calculate the bond dissociation enthalpy of $\mathrm{O}-\mathrm{O}$ bond in $\mathrm{H}_2 \mathrm{O}_2,$ assuming that the bond dissociation enthalpy of $\mathrm{O}-\mathrm{H}$ bond is same in both $\mathrm{H}_2 \mathrm{O}$ and $\mathrm{H}_2 \mathrm{O}_2.$

A gas, while expanding absorbs $25 \mathrm{~J}$ of heat and does $243 \mathrm{~J}$ of work. Thus, $\Delta E$ (change in internal energy) for the gas is