Chemistry (School & UG)

Q. What is the first ionization energy of lithium (Li) in kJ/mol?
  • A. 520 kJ/mol
  • B. 750 kJ/mol
  • C. 1000 kJ/mol
  • D. 1500 kJ/mol
Q. What is the first ionization energy of magnesium (Mg) in kJ/mol?
  • A. 738 kJ/mol
  • B. 1000 kJ/mol
  • C. 580 kJ/mol
  • D. 1200 kJ/mol
Q. What is the formula for calculating the boiling point elevation?
  • A. ΔT_b = i * K_b * m
  • B. ΔT_b = K_b / m
  • C. ΔT_b = i * K_f * m
  • D. ΔT_b = K_f * m
Q. What is the formula for the complex formed when iron(III) ions react with thiocyanate ions?
  • A. [Fe(SCN)3]
  • B. [Fe(SCN)2]
  • C. [Fe(SCN)6]3+
  • D. [Fe(SCN)4]2+
Q. What is the formula for the compound formed between hydrogen and sulfur?
  • A. H2S
  • B. HS
  • C. H2SO4
  • D. H2SO3
Q. What is the function of phosphoric acid in soft drinks?
  • A. Sweetener
  • B. Preservative
  • C. Flavor enhancer
  • D. Acidulant
Q. What is the function of sodium citrate in food applications?
  • A. Preservative
  • B. Emulsifier
  • C. Buffering agent
  • D. Coloring agent
Q. What is the functional group of carboxylic acids?
  • A. Amino
  • B. Hydroxyl
  • C. Carboxyl
  • D. Carbonyl
Q. What is the functional group of esters?
  • A. Aldehyde
  • B. Carboxyl
  • C. Ester
  • D. Amine
Q. What is the functional group present in aldehydes?
  • A. -OH
  • B. -COOH
  • C. -CHO
  • D. -NH2
Q. What is the functional group present in alkenes?
  • A. Alcohol
  • B. Aldehyde
  • C. Alkene
  • D. Alkyne
Q. What is the geometry of a molecule with sp hybridization?
  • A. Linear
  • B. Trigonal planar
  • C. Tetrahedral
  • D. Bent
Q. What is the geometry of the complex ion [Cu(NH3)4]SO4?
  • A. Tetrahedral
  • B. Square planar
  • C. Octahedral
  • D. Trigonal bipyramidal
Q. What is the Gibbs free energy change (ΔG) at 298 K for a reaction with ΔH = -100 kJ and ΔS = -200 J/K?
  • A. -100 kJ
  • B. -200 kJ
  • C. 0 kJ
  • D. 100 kJ
Q. What is the half-life of a first-order reaction dependent on?
  • A. Initial concentration
  • B. Rate constant only
  • C. Both initial concentration and rate constant
  • D. Temperature only
Q. What is the half-life of a first-order reaction?
  • A. Constant and independent of initial concentration
  • B. Depends on initial concentration
  • C. Increases with time
  • D. Decreases with time
Q. What is the hybridization of a molecule with a central atom forming 4 sigma bonds and no lone pairs?
  • A. sp
  • B. sp2
  • C. sp3
  • D. dsp3
Q. What is the hybridization of the carbon atoms in 1-butyne?
  • A. sp
  • B. sp2
  • C. sp3
  • D. sp3d
Q. What is the hybridization of the central atom in BF3?
  • A. sp
  • B. sp2
  • C. sp3
  • D. sp3d
Q. What is the hybridization of the central atom in methane (CH4)?
  • A. sp
  • B. sp2
  • C. sp3
  • D. sp3d
Q. What is the hybridization of the central atom in phosphorus pentachloride (PCl5)?
  • A. sp
  • B. sp2
  • C. sp3
  • D. sp3d
Q. What is the hybridization of the central atom in SF4?
  • A. sp
  • B. sp2
  • C. sp3
  • D. sp3d
Q. What is the hybridization of the central atom in the complex [Ni(CO)4]?
  • A. sp
  • B. sp2
  • C. sp3
  • D. d2sp3
Q. What is the hybridization of the central metal ion in the complex [Ni(CO)4]?
  • A. sp
  • B. sp2
  • C. sp3
  • D. d2sp3
Q. What is the ideal gas constant (R) value in L·atm/(K·mol)?
  • A. 0.0821
  • B. 8.314
  • C. 62.36
  • D. 1.987
Q. What is the ideal gas law equation?
  • A. PV = nRT
  • B. PV = nR
  • C. PV = RT
  • D. P = nRT/V
Q. What is the impact of removing a product from a reaction at equilibrium?
  • A. Shifts equilibrium to the right
  • B. Shifts equilibrium to the left
  • C. No effect on equilibrium
  • D. Increases the reaction rate
Q. What is the integrated rate law for a second-order reaction?
  • A. [A] = [A]0 - kt
  • B. 1/[A] = 1/[A]0 + kt
  • C. [A] = [A]0e^(-kt)
  • D. ln[A] = ln[A]0 - kt
Q. What is the integrated rate law for a zero-order reaction?
  • A. [A] = [A]0 - kt
  • B. [A] = [A]0 + kt
  • C. [A] = [A]0e^(-kt)
  • D. [A] = kt + [A]0
Q. What is the ionization energy trend across a period?
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Fluctuates
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