Chemistry (School & UG)

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The Chemistry (School & UG) category covers the fundamental to advanced concepts of Chemistry, structured to support Class 11–12 students, competitive exam aspirants, and undergraduate learners. The content emphasizes conceptual clarity, problem-solving skills, and strong alignment with NCERT and university syllabi.

In this category, you will study:

  • Physical Chemistry – atomic structure, thermodynamics, chemical kinetics, equilibrium, electrochemistry, and solutions

  • Organic Chemistry – basic principles, reaction mechanisms, hydrocarbons, functional groups, biomolecules, and polymers

  • Inorganic Chemistry – periodic trends, chemical bonding, coordination compounds, metallurgy, and s-, p-, d-, and f-block elements

  • Numerical problem-solving – formula-based calculations, mole concept, and graph-based questions

  • Reaction mechanisms and derivations with step-by-step explanations

  • Comparisons, trends, and exceptions important for exams

  • NCERT-based theory, supported by diagrams, tables, MCQs, assertion–reason questions, numericals, and PYQs

The content is designed to build strong foundations, improve analytical and quantitative skills, and prepare students for school examinations, competitive exams, and undergraduate assessments.

Develop a clear, logical, and application-oriented understanding of Chemistry to excel academically and confidently tackle problem-based and conceptual questions at both school and UG levels.

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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