Multiple Choice QuestionsAssume each reaction is carried out in an open container. For which reaction will ΔH = ΔE?
H2 (g) + Br2 (g) →2HBr (g)
C (s) + 2 H2O (g) → 2 H2 (g) + CO2 (g)
PCl5 (g) →PCl3 (g) + Cl2 (g)
PCl5 (g) →PCl3 (g) + Cl2 (g)
A.
H2 (g) + Br2 (g) →2HBr (g)
Assume each reaction is carried out in an open container. For which reaction will ΔH = ΔE?
The enthalpy of combustion of H2, cyclohexene (C6H10) and cyclohexene (C6H12) are -241, -3800 and -3920 kJ per mol respectively.The heat of hydrogenation of cyclohexane is:
-212 kJ mol
+121 kJ mol
+242 kJ per mol
+242 kJ per mol
A.
-212 kJ mol
The enthalpy of combustion of H2, cyclohexene (C6H10) and cyclohexene (C6H12) are -241, -3800 and -3920 kJ per mol respectively.The heat of hydrogenation of cyclohexane is:
Which of the following pairs consitutes a buffer?
HNO2 and NaNO2
NaOH and NaCl
HNO3 and NH4NO3
HNO3 and NH4NO3
A.
HNO2 and NaNO2
Which of the following pairs consitutes a buffer?
Identify the correct statement for the change of Gibbs energy for a system (ΔGsystem) at constant temperature and pressure
If ΔGsystem > 0, the process is spontaneous
If ΔGsystem =0, the system has attained equilibrium
If ΔGsystem < 0, the system is still moving in a particular direction
If ΔGsystem < 0, the system is still moving in a particular direction
B.
If ΔGsystem =0, the system has attained equilibrium
Identify the correct statement for the change of Gibbs energy for a system (ΔGsystem) at constant temperature and pressure
The hydrogen ion concentration of a 10-8 M HCL aqueous solution at 298 K (Kw = 10-14) is:
1.0 x 10-6
1.0525 x 10-7 M
9.525 x 10-8 M
9.525 x 10-8 M
B.
1.0525 x 10-7 M
The hydrogen ion concentration of a 10-8 M HCL aqueous solution at 298 K (Kw = 10-14) is:
Given: The mass of electron is 9.11 x 10-31 kg
Planck constant is 6.626 x 10-34 Js,
the uncertainty involved in the measurement of velocity within a distance of 0.1 A is:
5.79 x 106 ms-1
5.79 x 107 ms-1
5.79 x 108 ms-1
5.79 x 108 ms-1
A.
5.79 x 106 ms-1
Given: The mass of electron is 9.11 x 10-31 kg
Planck constant is 6.626 x 10-34 Js,
the uncertainty involved in the measurement of velocity within a distance of 0.1 A is:
For the reaction,
CH4 (g) + 2 O2 (g) ⇌ CO2 (g) + 2H2O (l),
ΔrH = - 170. 8 kJ mol-1
Which of the following statements is not true?
At equilibrium, the concentrations of CO2 (g) and H2O (l) are not equal
The equilibrium constant for the reaction is given by Kp = 
Addition of CH4 (g) or O2 (g) at equilibrium will cause a shift to the right
Addition of CH4 (g) or O2 (g) at equilibrium will cause a shift to the right
B.
The equilibrium constant for the reaction is given by Kp =
For the reaction,
CH4 (g) + 2 O2 (g) ⇌ CO2 (g) + 2H2O (l),
ΔrH = - 170. 8 kJ mol-1
Which of the following statements is not true?
In which of the following molecules are all the bonds not equal?
ClF3
BF3
AlF3
AlF3
A.
ClF3
In which of the following molecules are all the bonds not equal?
The orientation of an atomic orbital is governed by:
azimuthal quantum number
spin quantum number
magnetic quantum number
magnetic quantum number
C.
magnetic quantum number
The orientation of an atomic orbital is governed by:
The enthalpy and entropy change for the reaction:
Br2 (l) + Cl2 (g)→ 2BrCl (g)
are 30 kJ mol-1 and 105 JK-1 mol-1 respectively. The temperature at which the reaction will be in equilibrium is:
285.7 K
273 K
450 K
450 K
A.
285.7 K
The enthalpy and entropy change for the reaction:
Br2 (l) + Cl2 (g)→ 2BrCl (g)
are 30 kJ mol-1 and 105 JK-1 mol-1 respectively. The temperature at which the reaction will be in equilibrium is:
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