Chemistry Syllabus (JEE Main)

Q. In a reaction at equilibrium, if the concentration of a reactant is decreased, what will happen?
  • A. Shift to the right
  • B. Shift to the left
  • C. No change
  • D. Increase the rate of reaction
Q. In a reaction at equilibrium, if the concentration of products increases, what will happen to the equilibrium position?
  • A. Shift to the left
  • B. Shift to the right
  • C. No change
  • D. Depends on temperature
Q. In a reaction at equilibrium, if the concentration of products is decreased, what will happen?
  • A. Shift to the right
  • B. Shift to the left
  • C. No change
  • D. Depends on the temperature
Q. In a reaction at equilibrium, if the concentration of reactants is increased, what will happen to the equilibrium?
  • A. Shift to the right
  • B. Shift to the left
  • C. No change
  • D. Equilibrium constant increases
Q. In a reaction at equilibrium, if the concentration of reactants is increased, what will happen to the equilibrium position?
  • A. Shift to the right
  • B. Shift to the left
  • C. No change
  • D. Depends on the reaction
Q. In a reaction at equilibrium, if the temperature is decreased, what will happen to the equilibrium position if the reaction is exothermic?
  • A. Shift to the right
  • B. Shift to the left
  • C. No change
  • D. Depends on the concentration
Q. In a reaction at equilibrium, if the temperature is increased and the reaction is exothermic, what will happen to the equilibrium position?
  • A. Shift to the right
  • B. Shift to the left
  • C. No change
  • D. Equilibrium constant increases
Q. In a reaction at equilibrium, if the temperature is increased, what will happen to the equilibrium constant Kc for an endothermic reaction?
  • A. Increase
  • B. Decrease
  • C. No change
  • D. Depends on concentration
Q. In a reaction mechanism, the slowest step is known as the:
  • A. Rate-determining step
  • B. Intermediate step
  • C. Fast step
  • D. Catalytic step
Q. In a reaction mechanism, the slowest step is known as what?
  • A. Rate-determining step
  • B. Intermediate step
  • C. Fast step
  • D. Catalytic step
Q. In a reaction where 2 moles of hydrogen react with 1 mole of oxygen, how many moles of water are produced?
  • A. 1 mole
  • B. 2 moles
  • C. 3 moles
  • D. 4 moles
Q. In a reaction where ΔH is positive and ΔS is negative, what is the sign of ΔG at high temperatures?
  • A. Positive
  • B. Negative
  • C. Zero
  • D. Cannot be determined
Q. In a reaction, 3 moles of A react with 2 moles of B to produce 4 moles of C. What is the mole ratio of A to C?
  • A. 3:4
  • B. 2:3
  • C. 4:3
  • D. 1:1
Q. In a reaction, if the enthalpy change (ΔH) is -100 kJ and the entropy change (ΔS) is 200 J/K, what is the Gibbs free energy change (ΔG) at 298 K?
  • A. -100 kJ
  • B. -50 kJ
  • C. 0 kJ
  • D. 50 kJ
Q. In a reaction, if the rate constant doubles when the temperature increases by 10°C, what is the activation energy (Ea) approximately?
  • A. 20 kJ/mol
  • B. 40 kJ/mol
  • C. 60 kJ/mol
  • D. 80 kJ/mol
Q. In a redox reaction, which species is reduced?
  • A. Oxidizing agent
  • B. Reducing agent
  • C. Product
  • D. Reactant
Q. In a reversible process, the change in entropy of the universe is:
  • A. Positive
  • B. Negative
  • C. Zero
  • D. Undefined
Q. In a reversible process, the change in Gibbs free energy (ΔG) is:
  • A. Always positive
  • B. Always negative
  • C. Zero at equilibrium
  • D. None of the above
Q. In a reversible process, the change in Gibbs free energy is equal to:
  • A. Zero
  • B. Enthalpy
  • C. Entropy
  • D. Temperature
Q. In a solution of 1 mol of solute in 9 mol of solvent, what is the mole fraction of the solute?
  • A. 0.1
  • B. 0.2
  • C. 0.5
  • D. 0.9
Q. In a solution of 1 mole of solute B in 3 moles of solvent A, what is the mole fraction of solvent A?
  • A. 0.25
  • B. 0.75
  • C. 0.33
  • D. 0.67
Q. In a solution of a non-volatile solute, how does the addition of solute affect the boiling point of the solvent?
  • A. It decreases the boiling point
  • B. It has no effect on the boiling point
  • C. It increases the boiling point
  • D. It depends on the nature of the solute
Q. In a solution of a non-volatile solute, how does the vapor pressure compare to that of the pure solvent?
  • A. Higher than the pure solvent
  • B. Lower than the pure solvent
  • C. Equal to the pure solvent
  • D. Depends on the temperature
Q. In a solution of two volatile components A and B, if the mole fraction of A is 0.6, what is the vapor pressure of the solution if the vapor pressure of pure A is 100 mmHg and that of pure B is 50 mmHg?
  • A. 80 mmHg
  • B. 90 mmHg
  • C. 70 mmHg
  • D. 60 mmHg
Q. In a solution of volatile components A and B, if the vapor pressure of A is 80 mmHg and that of B is 20 mmHg, what is the total vapor pressure?
  • A. 100 mmHg
  • B. 80 mmHg
  • C. 60 mmHg
  • D. 20 mmHg
Q. In a spontaneous process, the change in Gibbs free energy (ΔG) is:
  • A. Positive
  • B. Negative
  • C. Zero
  • D. Undefined
Q. In a static equilibrium problem, if the sum of clockwise moments equals the sum of counterclockwise moments, what can be concluded?
  • A. The object is in equilibrium
  • B. The object is accelerating
  • C. The object is in motion
  • D. The object is unstable
Q. In a system at equilibrium, if the concentration of reactants is increased, what will happen to the equilibrium position?
  • A. Shift to the right
  • B. Shift to the left
  • C. No change
  • D. Depends on temperature
Q. In a system of two blocks connected by a spring, if the spring is compressed, what is the condition for equilibrium?
  • A. Net force acting on the system is zero
  • B. Net momentum of the system is constant
  • C. Kinetic energy is maximized
  • D. Potential energy is minimized
Q. In a system where two forces act at an angle of 90 degrees, how do you find the resultant force?
  • A. By adding the forces algebraically
  • B. Using the Pythagorean theorem
  • C. By taking the average of the two forces
  • D. By subtracting the smaller force from the larger force
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