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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