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. In the reaction PCl5(g) ⇌ PCl3(g) + Cl2(g), what will happen if Cl2 is removed from the system?
  • A. Shift to the left
  • B. Shift to the right
  • C. No change
  • D. Increase the rate of reaction
Q. In the van der Waals equation, what do the 'a' and 'b' constants represent?
  • A. Attraction and volume correction
  • B. Pressure and temperature
  • C. Density and molar mass
  • D. Entropy and enthalpy
Q. In titration, what is the purpose of the indicator?
  • A. To increase the reaction rate
  • B. To provide a visual signal of endpoint
  • C. To stabilize the pH
  • D. To dilute the solution
Q. In UV-Vis spectroscopy, what does a higher absorbance indicate about the concentration of a sample?
  • A. Lower concentration
  • B. Higher concentration
  • C. No correlation
  • D. Increased path length
Q. In UV-Vis spectroscopy, what does a higher absorbance indicate about the concentration of a solution?
  • A. Lower concentration
  • B. Higher concentration
  • C. No correlation
  • D. Increased temperature
Q. In UV-Vis spectroscopy, what does a higher absorbance indicate?
  • A. Lower concentration of the analyte
  • B. Higher concentration of the analyte
  • C. Higher wavelength of light
  • D. Lower energy of light
Q. In UV-Vis spectroscopy, what does a higher absorbance value indicate?
  • A. Lower concentration of the analyte
  • B. Higher concentration of the analyte
  • C. Higher wavelength of light
  • D. Lower path length of the sample
Q. In UV-Vis spectroscopy, what does a higher molar absorptivity indicate?
  • A. Lower concentration
  • B. Higher concentration
  • C. More efficient light absorption
  • D. Less efficient light absorption
Q. In UV-Vis spectroscopy, what does a peak at 260 nm typically indicate?
  • A. Presence of proteins
  • B. Presence of nucleic acids
  • C. Presence of carbohydrates
  • D. Presence of lipids
Q. In UV-Vis spectroscopy, what does a peak at 280 nm typically indicate?
  • A. Presence of nucleic acids
  • B. Presence of proteins
  • C. Presence of carbohydrates
  • D. Presence of lipids
Q. In UV-Vis spectroscopy, what does a peak in the absorbance spectrum indicate?
  • A. The presence of a specific ion
  • B. The concentration of a gas
  • C. The molecular weight of a compound
  • D. The boiling point of a solution
Q. In UV-Vis spectroscopy, what does a peak in the absorption spectrum indicate?
  • A. The presence of impurities
  • B. The concentration of the sample
  • C. A specific electronic transition
  • D. The temperature of the sample
Q. In UV-Vis spectroscopy, what does a shift in the absorption peak indicate?
  • A. Change in concentration
  • B. Change in pH
  • C. Change in molecular structure
  • D. Change in temperature
Q. In UV-Vis spectroscopy, what does the Beer-Lambert law relate?
  • A. Wavelength and energy
  • B. Absorbance and concentration
  • C. Frequency and intensity
  • D. Temperature and pressure
Q. In UV-Vis spectroscopy, what is the effect of increasing the path length of the sample cell?
  • A. Decreases absorbance
  • B. Increases absorbance
  • C. No effect on absorbance
  • D. Increases transmittance
Q. In Werner's theory, what does the term 'primary valence' refer to?
  • A. The oxidation state of the metal
  • B. The number of ligands
  • C. The type of ligands
  • D. The geometry of the complex
Q. In Werner's theory, what is the role of ligands in coordination compounds?
  • A. To provide electrons to the metal ion
  • B. To stabilize the oxidation state of the metal
  • C. To determine the color of the complex
  • D. To increase the coordination number
Q. In which application is hydrogen used as a reducing agent?
  • A. Electrolysis
  • B. Metal extraction
  • C. Acid-base neutralization
  • D. Combustion
Q. In which molecule is the bond angle closest to 120°?
  • A. H2O
  • B. CO2
  • C. BF3
  • D. NH3
Q. In which of the following compounds does hydrogen act as a Lewis acid?
  • A. H2O
  • B. HCl
  • C. BF3
  • D. H2
Q. In which of the following compounds does hydrogen exhibit an oxidation state of -1?
  • A. H2O
  • B. HCl
  • C. NaH
  • D. H2O2
Q. In which of the following compounds does the central atom exhibit sp3d2 hybridization?
  • A. SF6
  • B. XeF4
  • C. NH3
  • D. CCl4
Q. In which of the following compounds is the bond angle approximately 109.5 degrees?
  • A. H2O
  • B. NH3
  • C. CH4
  • D. BF3
Q. In which of the following compounds is the central atom sp3 hybridized?
  • A. BeCl2
  • B. CH4
  • C. CO2
  • D. NH3
Q. In which of the following coordination compounds does hydrogen act as a ligand?
  • A. [Fe(H2O)6]2+
  • B. [Cu(NH3)4]2+
  • C. [CoCl4]2-
  • D. [Ag(CN)2]-
Q. In which of the following molecules does hydrogen bonding occur?
  • A. CH4
  • B. H2O
  • C. CO2
  • D. N2
Q. In which of the following molecules is the bond length the shortest?
  • A. C2H2
  • B. C2H4
  • C. C2H6
  • D. C2
Q. In which of the following molecules is the central atom sp2 hybridized?
  • A. C2H4
  • B. C2H2
  • C. CH4
  • D. C3H6
Q. In which of the following molecules is the central atom sp3 hybridized?
  • A. BeCl2
  • B. SiCl4
  • C. PCl5
  • D. SF6
Q. In which of the following processes is hydrogen used to reduce metal ores?
  • A. Electrolysis
  • B. Hydrometallurgy
  • C. Pyrometallurgy
  • D. Hydrogen reduction
Showing 361 to 390 of 1878 (63 Pages)
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