NEET doubts
700 doubts found
What does “Reducing vs non-reducing sugars” actually mean in Amines & Biomolecules, and why does it matter for NEET?
sugars with a free aldehyde/ketone group (glucose, fructose, maltose) reduce Tollens'/Fehling's; sucrose does not.
I keep getting “Concentration terms” questions wrong in Some Basic Concepts (Mole Concept). What's the trap?
thinking molarity and molality are interchangeable.
I keep getting “Heisenberg uncertainty principle” questions wrong in Structure of Atom. What's the trap?
expecting a definite electron path.
I keep getting “Molecular polarity” questions wrong in Chemical Bonding & Molecular Structure. What's the trap?
calling any molecule with polar bonds a polar molecule.
I keep getting “Hess's law” questions wrong in Chemical Thermodynamics. What's the trap?
thinking ΔH depends on the reaction path.
I keep getting “pH scale” questions wrong in Equilibrium. What's the trap?
believing pH can't go below 0 or above 14.
What is the difference between oxidising agent and reducing agent?
An oxidising agent accepts electrons (and is reduced); a reducing agent donates electrons (and is oxidised).
I keep getting “Metallic character” questions wrong in Periodic Table & Periodicity. What's the trap?
confusing metallic character with electronegativity (they're opposites).
I keep getting “Half-life” questions wrong in Chemical Kinetics. What's the trap?
assuming half-life is constant for every order.
I keep getting “Nernst equation” questions wrong in Electrochemistry. What's the trap?
using standard potentials when concentrations aren't 1 M.
I keep getting “Carbocation stability” questions wrong in Organic Chemistry — Basic Concepts. What's the trap?
ranking a primary carbocation as more stable than a tertiary one.
What is the difference between substitution reaction and addition reaction?
Substitution swaps one atom/group for another (alkanes, benzene); addition breaks a multiple bond to add atoms across it (alkenes, alkynes).
I keep getting “Colligative property” questions wrong in Solutions & Colligative Properties. What's the trap?
thinking the kind of solute (sugar vs salt) matters more than how many particles it makes.
I keep getting “Types of crystalline solids” questions wrong in The Solid State. What's the trap?
assuming all solids conduct or melt similarly.
What does “Real vs ideal gas behaviour” actually mean in States of Matter: Gases, and why does it matter for NEET?
real gases deviate from PV = nRT at high pressure and low temperature, when molecular size and attractions can't be ignored.
I keep getting “Crystal field splitting” questions wrong in Coordination Compounds. What's the trap?
thinking the colour comes from the metal alone, regardless of ligands.
I keep getting “Grignard reagent” questions wrong in Haloalkanes & Haloarenes. What's the trap?
using a Grignard reagent in a wet apparatus.
I keep getting “Oxidation of alcohols” questions wrong in Alcohols, Phenols & Ethers. What's the trap?
trying to oxidise a tertiary alcohol to a ketone or acid.
I keep getting “Acidity of carboxylic acids” questions wrong in Aldehydes, Ketones & Carboxylic Acids. What's the trap?
ranking phenol as more acidic than a carboxylic acid.
I keep getting “Reducing vs non-reducing sugars” questions wrong in Amines & Biomolecules. What's the trap?
assuming every sugar is a reducing sugar.
What is the difference between empirical formula and molecular formula?
The empirical formula is the simplest whole-number ratio of atoms (CH₂O); the molecular formula is the actual count (C₆H₁₂O₆).
What is the difference between orbit and orbital?
An orbit is a fixed Bohr path (outdated); an orbital is a 3-D region of high probability for finding an electron.
What does “Hydrogen bonding” actually mean in Chemical Bonding & Molecular Structure, and why does it matter for NEET?
a strong dipole attraction when H is bonded to N, O or F.
What is the difference between enthalpy and entropy?
Enthalpy is about heat content/energy; entropy is about disorder — spontaneity balances the two through ΔG.