NEET UG CHEMISTRY MCQ: THERMODYNAMICS

1 Medium

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Analyzing +4 | -1

The heats of neutralization of

C{H_3}COOH,\,\,\,HCOOH,\,\,HCN

and

{H_2}S

are

- 13.2,\, - \,13.4,\, - 2.9

and - 3.8 kcal per equivalent respectively. Arrange the increasing order of strength.

View answer and explanation

Correct option: A

HCCOH > C{H_3}COOH > {H_2}S > HCN

Option A (

HCCOH > C{H_3}COOH > {H_2}S > HCN

) is correct because the strength of an acid is inversely proportional to its heat of neutralization; lower the heat of neutralization, stronger the acid.

More Questions from THERMODYNAMICS

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The internal energy of one mole of a gas is: An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system. If

{T_i}

is the initial temperature and

{T_f}

is the final temperature, which of the following statements is correct? For which of the process, ∆S is negative? The work done by a weightless piston in causing an expansion ∆V (at constant temperature), when the opposing pressure, P is variable, is given by: Assertion :- At constant pressure of the change

\mathrm{H}_2 \mathrm{O}(\mathrm{s}) \rightarrow \mathrm{H}_2 \mathrm{O}(\mathrm{g})

work done is negative.

Reason :- During phase transition work done is always negative. For the reaction,

\mathrm{X}_2 \mathrm{O_4(l}) \longrightarrow 2 \mathrm{XO}_2(\mathrm{g}), \Delta U=2.1 \mathrm{~kcal}, \Delta S=20 \mathrm{~cal} \mathrm{~K}^{-1}

300 \mathrm{~K}

. Hence,

\Delta G