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. Which of the following elements is most likely to form a +2 oxidation state?
A.
Magnesium
B.
Sodium
C.
Potassium
D.
Aluminum
Show solution
Solution
Magnesium commonly forms a +2 oxidation state by losing two electrons.
Correct Answer:
A
— Magnesium
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Q. Which of the following elements is most likely to form a complex ion in coordination chemistry?
A.
Sodium
B.
Calcium
C.
Copper
D.
Barium
Show solution
Solution
Copper is a transition metal and can form complex ions due to its ability to coordinate with ligands.
Correct Answer:
C
— Copper
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Q. Which of the following elements is most likely to form a coordination compound with a transition metal?
A.
Sodium
B.
Chlorine
C.
Water
D.
Oxygen
Show solution
Solution
Water is a common ligand that can form coordination compounds with transition metals.
Correct Answer:
C
— Water
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Q. Which of the following elements is most likely to form a coordination compound with a coordination number of 6?
A.
Copper
B.
Iron
C.
Nickel
D.
Cobalt
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Solution
Cobalt commonly forms coordination compounds with a coordination number of 6 due to its ability to accommodate six ligands.
Correct Answer:
D
— Cobalt
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Q. Which of the following elements is most likely to lose an electron?
A.
Fluorine
B.
Sodium
C.
Chlorine
D.
Oxygen
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Solution
Sodium is an alkali metal and readily loses one electron to achieve a stable electron configuration.
Correct Answer:
B
— Sodium
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Q. Which of the following elements would have the largest first ionization energy?
A.
Lithium
B.
Beryllium
C.
Boron
D.
Carbon
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Solution
Carbon has a larger first ionization energy than lithium, beryllium, and boron due to its higher effective nuclear charge.
Correct Answer:
D
— Carbon
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Q. Which of the following elements would you expect to have the largest atomic radius?
A.
Lithium
B.
Sodium
C.
Potassium
D.
Rubidium
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Solution
Rubidium has the largest atomic radius due to having the most electron shells among the given options.
Correct Answer:
D
— Rubidium
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Q. Which of the following factors can affect the accuracy of a titration?
A.
Temperature
B.
Concentration of the titrant
C.
Indicator choice
D.
All of the above
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Solution
All of the listed factors, including temperature, concentration of the titrant, and choice of indicator, can affect the accuracy of a titration.
Correct Answer:
D
— All of the above
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Q. Which of the following factors does NOT affect colligative properties?
A.
Number of solute particles
B.
Nature of the solute
C.
Temperature
D.
Solvent identity
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Solution
Colligative properties depend primarily on the number of solute particles, not the nature of the solute.
Correct Answer:
B
— Nature of the solute
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Q. Which of the following functional groups can exhibit stereoisomerism?
A.
Alcohols
B.
Aldehydes
C.
Alkenes
D.
Ketones
Show solution
Solution
Alkenes can exhibit stereoisomerism due to the presence of a double bond, allowing for cis and trans configurations.
Correct Answer:
C
— Alkenes
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Q. Which of the following functional groups is commonly found in polyesters?
A.
Amide
B.
Ester
C.
Alcohol
D.
Aldehyde
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Solution
Polyesters are formed from the reaction of diols and dicarboxylic acids, which contain ester functional groups.
Correct Answer:
B
— Ester
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Q. Which of the following functional groups is most likely to enhance adsorption on a metal surface?
A.
Hydroxyl group
B.
Carboxylic acid
C.
Amino group
D.
Alkyl group
Show solution
Solution
Functional groups like hydroxyl and carboxylic acids can form hydrogen bonds or coordinate with metal surfaces, enhancing adsorption.
Correct Answer:
B
— Carboxylic acid
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Q. Which of the following functional groups is present in amino acids?
A.
Carboxyl group
B.
Hydroxyl group
C.
Carbonyl group
D.
Aldehyde group
Show solution
Solution
Amino acids contain both an amino group (-NH2) and a carboxyl group (-COOH), making the carboxyl group a key functional group.
Correct Answer:
A
— Carboxyl group
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Q. Which of the following functional groups is present in carboxylic acids?
A.
Aldehyde
B.
Alcohol
C.
Carboxyl
D.
Ester
Show solution
Solution
Carboxylic acids contain the carboxyl functional group (-COOH), which is the defining feature of this class of compounds.
Correct Answer:
C
— Carboxyl
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Q. Which of the following gases behaves most ideally?
A.
Noble gases
B.
Water vapor
C.
Carbon dioxide
D.
Ammonia
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Solution
Noble gases behave most ideally because they have minimal intermolecular forces and occupy a larger volume relative to their number of moles.
Correct Answer:
A
— Noble gases
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Q. Which of the following gases is expected to behave most ideally?
A.
NH3
B.
CO2
C.
He
D.
H2O
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Solution
Helium (He) is a noble gas with minimal intermolecular forces and small molecular size, making it behave most ideally.
Correct Answer:
C
— He
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Q. Which of the following haloalkanes has the highest boiling point?
A.
CH3Cl
B.
C2H5Cl
C.
C3H7Cl
D.
C4H9Cl
Show solution
Solution
C4H9Cl has the highest boiling point due to increased molecular weight and surface area leading to stronger van der Waals forces.
Correct Answer:
D
— C4H9Cl
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Q. Which of the following has the smallest atomic radius?
Show solution
Solution
Carbon (C) has the smallest atomic radius among the given elements due to increased nuclear charge.
Correct Answer:
D
— C
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Q. Which of the following hybridizations corresponds to a tetrahedral molecular geometry?
A.
sp
B.
sp2
C.
sp3
D.
dsp3
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Solution
Tetrahedral geometry corresponds to sp3 hybridization, where one s and three p orbitals mix to form four equivalent sp3 hybrid orbitals.
Correct Answer:
C
— sp3
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Q. Which of the following hydrogen compounds is most likely to act as a Lewis acid?
A.
H2O
B.
HCl
C.
B2H6
D.
NH3
Show solution
Solution
Boron hydride (B2H6) can accept electron pairs, making it a Lewis acid.
Correct Answer:
C
— B2H6
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Q. Which of the following hydrogen compounds is most likely to act as a reducing agent?
A.
H2O
B.
H2S
C.
HCl
D.
H2O2
Show solution
Solution
H2S can donate electrons and thus acts as a reducing agent.
Correct Answer:
B
— H2S
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Q. Which of the following hydrogen compounds is used in the production of fertilizers?
A.
Hydrogen sulfide
B.
Ammonia
C.
Hydrochloric acid
D.
Water
Show solution
Solution
Ammonia, produced from hydrogen and nitrogen, is a key ingredient in the manufacture of fertilizers.
Correct Answer:
B
— Ammonia
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Q. Which of the following indicators is most suitable for a strong acid-strong base titration?
A.
Phenolphthalein
B.
Methyl orange
C.
Bromothymol blue
D.
Litmus
Show solution
Solution
Bromothymol blue is suitable for strong acid-strong base titrations as it changes color around pH 7, which is the equivalence point.
Correct Answer:
C
— Bromothymol blue
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Q. Which of the following instruments is commonly used for IR spectroscopy?
A.
Mass spectrometer
B.
Nuclear magnetic resonance spectrometer
C.
Fourier-transform infrared spectrometer
D.
Gas chromatograph
Show solution
Solution
A Fourier-transform infrared spectrometer (FTIR) is commonly used for IR spectroscopy to obtain high-resolution spectra.
Correct Answer:
C
— Fourier-transform infrared spectrometer
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Q. Which of the following instruments is commonly used for UV-Vis spectroscopy?
A.
Mass spectrometer
B.
NMR spectrometer
C.
Spectrophotometer
D.
Chromatograph
Show solution
Solution
A spectrophotometer is the instrument commonly used to measure absorbance in UV-Vis spectroscopy.
Correct Answer:
C
— Spectrophotometer
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Q. Which of the following ions can be detected using a colorimetric method?
A.
Sodium
B.
Calcium
C.
Iron
D.
Potassium
Show solution
Solution
Iron can be detected using colorimetric methods, as it forms colored complexes with specific reagents.
Correct Answer:
C
— Iron
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Q. Which of the following ions can be detected using a flame test that produces a green flame?
A.
Sodium
B.
Barium
C.
Potassium
D.
Calcium
Show solution
Solution
Barium ions produce a green flame during a flame test, while sodium produces a yellow flame, potassium a lilac flame, and calcium an orange-red flame.
Correct Answer:
B
— Barium
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Q. Which of the following ions can be detected using a silver nitrate test?
A.
Chloride ions
B.
Sulfate ions
C.
Nitrate ions
D.
Phosphate ions
Show solution
Solution
Chloride ions react with silver nitrate to form a white precipitate of silver chloride, indicating their presence.
Correct Answer:
A
— Chloride ions
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Q. Which of the following ions can be detected using flame photometry?
A.
Sodium
B.
Calcium
C.
Potassium
D.
All of the above
Show solution
Solution
Flame photometry can detect multiple alkali and alkaline earth metal ions, including sodium, calcium, and potassium.
Correct Answer:
D
— All of the above
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Q. Which of the following ions can be detected using flame tests?
A.
Sodium
B.
Calcium
C.
Barium
D.
All of the above
Show solution
Solution
Flame tests can be used to detect various metal ions, including sodium, calcium, and barium.
Correct Answer:
D
— All of the above
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