NEET · Chemistry doubts
180 doubts found
I keep getting “Filling rules” questions wrong in Structure of Atom. What's the trap?
pairing electrons in a subshell before every orbital has one.
I keep getting “Hybridization” questions wrong in Chemical Bonding & Molecular Structure. What's the trap?
predicting geometry without counting lone pairs in the hybridization.
I keep getting “Gibbs free energy” questions wrong in Chemical Thermodynamics. What's the trap?
judging spontaneity from ΔH alone.
I keep getting “Equilibrium constant” questions wrong in Equilibrium. What's the trap?
including pure solids/liquids in the K expression.
I keep getting “Oxidising and reducing agents” questions wrong in Redox Reactions. What's the trap?
calling the substance that is oxidised the 'oxidising agent'.
I keep getting “Electronegativity” questions wrong in Periodic Table & Periodicity. What's the trap?
assuming metals have high electronegativity.
I keep getting “Activation energy” questions wrong in Chemical Kinetics. What's the trap?
thinking a catalyst changes ΔH or the position of equilibrium.
I keep getting “Electrode potential” questions wrong in Electrochemistry. What's the trap?
forgetting to keep reduction potentials consistent when subtracting.
I keep getting “Electrophiles and nucleophiles” questions wrong in Organic Chemistry — Basic Concepts. What's the trap?
swapping the two definitions.
I keep getting “Aromaticity” questions wrong in Hydrocarbons. What's the trap?
expecting benzene to undergo addition like an alkene.
At the same concentration, why does calcium chloride melt ice better than glucose?
Colligative effects depend on the number of dissolved particles, captured by the van't Hoff factor i.
I keep getting “Crystalline vs amorphous” questions wrong in The Solid State. What's the trap?
calling glass a true crystalline solid.
What does “Kinetic molecular theory” actually mean in States of Matter: Gases, and why does it matter for NEET?
gases are tiny, fast, far-apart particles in constant random motion; pressure comes from their collisions with the walls.
I keep getting “Ligands & coordination number” questions wrong in Coordination Compounds. What's the trap?
counting ligand molecules instead of donor atoms (a bidentate ligand donates twice).
I keep getting “Nucleophilic substitution” questions wrong in Haloalkanes & Haloarenes. What's the trap?
assuming every substrate reacts by the same mechanism.
I keep getting “Acidity of alcohols vs phenols” questions wrong in Alcohols, Phenols & Ethers. What's the trap?
ranking an alcohol as more acidic than a phenol.
I keep getting “Nucleophilic addition to carbonyls” questions wrong in Aldehydes, Ketones & Carboxylic Acids. What's the trap?
thinking ketones are more reactive than aldehydes.
I keep getting “Basicity of amines” questions wrong in Amines & Biomolecules. What's the trap?
thinking aniline is more basic than an alkylamine.
What does “Concentration terms” actually mean in Some Basic Concepts (Mole Concept), and why does it matter for NEET?
molarity is moles of solute per litre of solution; molality is moles per kilogram of solvent.
What does “Heisenberg uncertainty principle” actually mean in Structure of Atom, and why does it matter for NEET?
you cannot know an electron's exact position and momentum at the same time.
What does “Molecular polarity” actually mean in Chemical Bonding & Molecular Structure, and why does it matter for NEET?
a molecule is polar only if bond dipoles don't cancel, which depends on both electronegativity and shape.
What does “Hess's law” actually mean in Chemical Thermodynamics, and why does it matter for NEET?
the total enthalpy change is the same no matter the route taken.
What does “pH scale” actually mean in Equilibrium, and why does it matter for NEET?
pH = −log[H⁺]; below 7 is acidic, above 7 is basic, 7 is neutral at 25°C.
What is the difference between oxidation and reduction?
Oxidation is loss of electrons (oxidation number rises); reduction is gain of electrons (oxidation number falls).