Gamma Question Bank for Medical Chemistry>Chapter 6 - Thermodynamics>Assignment>Q 31

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The heats of combustion of yellow $P$ and red $P$ are $- 9.91 kJ$ and $- 8.78 kJ$ respectively. The heat of transition of yellow to red phosphorus is

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Important Questions on Thermodynamics

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Gamma Question Bank for Medical Chemistry>Chapter 6 - Thermodynamics>Assignment>Q 32

If the heat of formation of

{NO}_{2}

is '

x

'

[1 / 2 N_{2 (g)} + O_{2 (g)} \to {NO}_{2 (g)}]

the heat of reaction

N_{2 (g)} + O_{2 (g)} \to 2 {NO}_{(g)}

is

y

and the heat of reaction

2 {NO}_{(g)} + O_{2 (g)} \to 2 {NO}_{2 (g)}

is

z

, then

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Gamma Question Bank for Medical Chemistry>Chapter 6 - Thermodynamics>Assignment>Q 33

In the reactions

HCl + NaOH \to NaCl + H_{2} O + x cal .

H_{2} {SO}_{4} + 2 NaOH \to {Na}_{2} {SO}_{4} + 2 H_{2} O + y cal

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Gamma Question Bank for Medical Chemistry>Chapter 6 - Thermodynamics>Assignment>Q 34

{ΔH}_{f} C_{2} H_{4} = 12.5 kcal

Heat of atomisation of

C = 171 kcal

Bond energy of

H_{2} = 104.3 kcal

Bond energy

C - H = 99.3 kcal

What is

C = C

bond energy?

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Gamma Question Bank for Medical Chemistry>Chapter 6 - Thermodynamics>Assignment>Q 35

The difference between

ΔH

and

ΔE

for the reaction

2 C_{6} H_{6} (l) + 15 O_{2} (g) \to 12 {CO}_{2} (g) + 6 H_{2} O (l)

at

25 ° C

in

kJ

is

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Gamma Question Bank for Medical Chemistry>Chapter 6 - Thermodynamics>Assignment>Q 36

$S_{(rhombic)} + O_{2 (g)} ⟶ {SO}_{2 (g)}$ ; $ΔH = - 297.5$ $kJ$

$S_{(monoclinic)} + O_{2 (g)} ⟶ {SO}_{2}_{(g)}$ ; $ΔH = - 300$ $kJ$

The data can predict that:

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Gamma Question Bank for Medical Chemistry>Chapter 6 - Thermodynamics>Assignment>Q 38

The volume of a gas expands by 0.25 m³ at a constant pressure of 10³ Nm^-2. The work done is equal to (magnitude):

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Gamma Question Bank for Medical Chemistry>Chapter 6 - Thermodynamics>Assignment>Q 39

When of anhydrous oxalic acid is burnt at

25 ° C

, the amount of heat liberated is

2.835 kJ . ΔH

combustion is (oxalic acid:

C_{2} H_{2} O_{4}

)

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Gamma Question Bank for Medical Chemistry>Chapter 6 - Thermodynamics>Assignment>Q 40

The heat of neutralization of

LiOH

and

HCl

at

25 ° C

is

34.868 kJ {mol}^{- 1}

. The heat of ionisation of

LiOH

will be