Chemistry (School & UG)

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Q. For the reaction 3H2(g) + N2(g) ⇌ 2NH3(g), if the temperature is decreased, what will be the effect on the equilibrium position?
  • A. Shift to the left
  • B. Shift to the right
  • C. No effect
  • D. Depends on pressure
Q. For the reaction 4H2(g) + 2O2(g) ⇌ 4H2O(g), what is the effect of increasing the temperature?
  • A. Shift to the left
  • B. Shift to the right
  • C. No change
  • D. Increase the rate of reaction
Q. For the reaction A + B → C, if the enthalpy change ΔH is -150 kJ/mol, what can be inferred about the reaction?
  • A. It is exothermic.
  • B. It is endothermic.
  • C. It is at equilibrium.
  • D. It requires energy input.
Q. For the reaction A + B ⇌ C + D, if ΔH = -150 kJ and ΔS = -200 J/K, what is the temperature at which the reaction becomes non-spontaneous?
  • A. 750 K
  • B. 750 °C
  • C. 300 K
  • D. 150 K
Q. For the reaction A(g) + B(g) ⇌ C(g), if the pressure is decreased, what will happen to the equilibrium?
  • A. Shift to the right
  • B. Shift to the left
  • C. No change
  • D. Reaction stops
Q. For the reaction CO(g) + 2H2(g) ⇌ CH3OH(g), if the pressure is increased, what will be the effect on the equilibrium position?
  • A. Shift to the left
  • B. Shift to the right
  • C. No effect
  • D. Depends on temperature
Q. For the reaction CO(g) + 2H2(g) ⇌ CH3OH(g), what happens if H2 is removed from the system?
  • A. Equilibrium shifts to the right
  • B. Equilibrium shifts to the left
  • C. No change occurs
  • D. Reaction stops
Q. For the reaction H2(g) + I2(g) ⇌ 2HI(g), if the temperature is increased and Kc decreases, what does this indicate about the reaction?
  • A. Exothermic
  • B. Endothermic
  • C. Reversible
  • D. Irreversible
Q. For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what happens if H2 is removed from the system?
  • A. Equilibrium shifts to the right
  • B. Equilibrium shifts to the left
  • C. No change occurs
  • D. NH3 concentration increases
Q. For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what happens if the concentration of NH3 is decreased?
  • A. Equilibrium shifts to the right
  • B. Equilibrium shifts to the left
  • C. No change
  • D. Reaction stops
Q. For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what is the effect of decreasing the volume of the container?
  • A. Shifts equilibrium to the right
  • B. Shifts equilibrium to the left
  • C. No effect on equilibrium
  • D. Increases the concentration of NH3
Q. For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what will happen if H2 is removed?
  • A. Shift to the right
  • B. Shift to the left
  • C. No change
  • D. Reaction stops
Q. For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what will happen if NH3 is removed from the system?
  • A. Shift to the right
  • B. Shift to the left
  • C. No change
  • D. Reaction stops
Q. For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what will happen if the concentration of NH3 is decreased?
  • A. Shifts to the right
  • B. Shifts to the left
  • C. No effect
  • D. Reaction stops
Q. How does dilution affect a reaction at equilibrium involving aqueous solutions?
  • A. Shifts equilibrium to the right
  • B. Shifts equilibrium to the left
  • C. No effect on equilibrium
  • D. Increases the rate of reaction
Q. How does increasing temperature affect an exothermic reaction at equilibrium?
  • A. Shifts equilibrium to the right
  • B. Shifts equilibrium to the left
  • C. No effect on equilibrium
  • D. Increases the rate of reaction
Q. How does increasing temperature affect the enthalpy of a substance?
  • A. It decreases enthalpy.
  • B. It increases enthalpy.
  • C. It has no effect.
  • D. It depends on the substance.
Q. How does increasing temperature generally affect the enthalpy of a system?
  • A. It decreases the enthalpy
  • B. It has no effect on enthalpy
  • C. It increases the enthalpy
  • D. It depends on the type of reaction
Q. How does increasing the temperature affect the equilibrium constant (K) of an endothermic reaction?
  • A. K decreases
  • B. K increases
  • C. K remains constant
  • D. K becomes zero
Q. How does the addition of an inert gas at constant volume affect the equilibrium of a reaction?
  • A. Shifts equilibrium to the right
  • B. Shifts equilibrium to the left
  • C. No effect on equilibrium
  • D. Increases the reaction rate
Q. How many grams of sodium chloride are needed to prepare 0.5 L of a 0.2 M solution?
  • A. 5.84 g
  • B. 11.68 g
  • C. 2.92 g
  • D. 0.58 g
Q. How many moles of potassium hydroxide are needed to neutralize 0.1 moles of hydrochloric acid?
  • A. 0.05
  • B. 0.1
  • C. 0.2
  • D. 0.3
Q. How many stereoisomers can 2,3-dimethylbutane have?
  • A. 2
  • B. 4
  • C. 8
  • D. 16
Q. How many stereoisomers can 2-pentene have?
  • A. 0
  • B. 1
  • C. 2
  • D. 4
Q. How many stereoisomers does 1,2-dichloropropane have?
  • A. 1
  • B. 2
  • C. 3
  • D. 4
Q. If 1 mole of NaCl is dissolved in water, how many particles are present in solution?
  • A. 1
  • B. 2
  • C. 3
  • D. 4
Q. If 25 mL of 0.5 M acetic acid is mixed with 25 mL of 0.5 M sodium acetate, what is the resulting pH of the buffer solution?
  • A. 4.76
  • B. 5.00
  • C. 5.76
  • D. 6.00
Q. If 50 mL of 0.1 M sulfuric acid is neutralized by sodium hydroxide, how many moles of NaOH are required?
  • A. 0.005
  • B. 0.01
  • C. 0.02
  • D. 0.03
Q. If a catalyst is added to the reaction A + B ⇌ C + D, what is the effect on the equilibrium position?
  • A. Shift to the left
  • B. Shift to the right
  • C. No change
  • D. Increase the rate of reaction
Q. If a compound has a molar absorptivity of 200 L/(mol·cm) and a concentration of 0.01 mol/L, what is the absorbance at a path length of 1 cm?
  • A. 0.2
  • B. 2
  • C. 20
  • D. 0.02
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