### Chemistry - Chemical Thermodynamics

#### Question - 1

Which of the following are arranged in correct order of value?

• A 1 erg > 1 J > 1 cal
• B 1 erg > 1 cal > 1 J
• C 1 cal > 1 J > 1 erg
• D 1 J > 1 cal > 1 erg

#### Question - 2

Which of the following is a path function?

• A Temperature
• B Volume
• C Heat
• D Pressure

#### Question - 3

During the adiabatic process,

• A pressure is maintained constant
• B gas is isothermally expanded
• C there is a perfect heat insulation
• D the system changes heat with surroundings

#### Question - 4

In a adiabatic process, no transfer of heat takes place between system and surroundings.  Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following.

• A $q=0, \triangle T \neq 0, W = 0$
• B $q\neq0, \triangle T= 0, W = 0$
• C $q=0, \triangle T = 0, W = 0$
• D $q=0, \triangle T < 0, W \neq 0$

#### Question - 5

If door of a refrigerator is kept open then we get

• A room cooled
• B room heated
• C more heat is passed out
• D No effect on room

#### Question - 6

$\triangle_fU^o$ of formation of $CH_4(g)$ at certain temperature is $-393\ kJ\ mol^{-1}.$
The value of $\triangle _FH^o$ is

• A zero
• B $< \triangle _f U^0$
• C $> \triangle _f U^0$
• D equal to $\triangle _f U^-$

#### Question - 7

When 401 J of heat is supplied to system and work done by system is  8 J then $\triangle U$ of system during this process is

• A 32 J
• B 40 J
• C 36 J
• D 44 J

#### Question - 8

At $25^oC$ and 1 bar pressure with $\triangle H^o$ (formation) = 0, which of the following represent the physical state of element?

• A C(diamond), $S_s(s), Na(s)$
• B C (diamond), C(graphite), $Br_2(l)$
• C C(graphite), $Br_2(g), P_4(white)$
• D C(graphite), $Br_2(l), i_2(s)$

#### Question - 9

On the basis of thermochemical equation (A), (B) and (C), find out which of the algebraic relationships given in option (a) to (d) is correct?
(A)  $C(graphite)+ O_2(g) \longrightarrow CO_2(g);$
(B)  $C(graphite)+{1\over 2}O_2(g) \longrightarrow CO(g)+1/2\ O_2(g)\longrightarrow CO_2(g)$
(C)  $CO(g) +1/2O_2(g)\longrightarrow CO_2(g);$
$\triangle_cH=z\ kJ\ mol^{-1}$

• A z = x + y
• B x = y - z
• C x = y + z
• D y = 2z - x

#### Question - 10

During complete combustion of one mole of butane, 2658 kJ of heat is released.  The thermochemical reaction for above change is

• A $2\ C_4H_{10}(g)+13\ O_2(g) \longrightarrow 8CO_2(g)+10H_2O(l); \triangle_CH=-2658.0\ kJ\ mol^{-1}$
• B $C_4H_{10}(g)+{13\over 2}O_2(g)\longrightarrow 4CO_2(g)+5H_2O(g)$
• C $C_4H_{10}(g)+{13\over 2}O_2(g) \longrightarrow 4CO_2(g) +5H_2O(l); \triangle H=-2658.0\ kJ\ mol^{-1}$
• D $2\ C_4H_{10}(g)+13\ O_2(g) \longrightarrow 8CO_2(g)+10H_2O(l); \triangle _CH=+2658.0\ kJ\ mol^{-1}$
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