NEET doubts
700 doubts found
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).
What does “Metallic character” actually mean in Periodic Table & Periodicity, and why does it matter for NEET?
the tendency to lose electrons; it decreases across a period and increases down a group.
What does “Half-life” actually mean in Chemical Kinetics, and why does it matter for NEET?
the time for a reactant to fall to half its amount; for first-order reactions it's constant.
What does “Nernst equation” actually mean in Electrochemistry, and why does it matter for NEET?
adjusts electrode potential for non-standard concentrations.
What does “Carbocation stability” actually mean in Organic Chemistry — Basic Concepts, and why does it matter for NEET?
order 3° > 2° > 1°, because alkyl groups donate electrons and stabilise the positive charge.
What is the difference between alkane and alkene?
An alkane has only single C–C bonds (saturated, reacts by substitution); an alkene has a C=C double bond (unsaturated, reacts by addition).
What does “Colligative property” actually mean in Solutions & Colligative Properties, and why does it matter for NEET?
a property that depends only on the NUMBER of solute particles, not their identity — like freezing-point depression or osmotic pressure.
What does “Types of crystalline solids” actually mean in The Solid State, and why does it matter for NEET?
ionic (electrostatic), covalent-network (diamond), metallic (electron sea) and molecular (weak forces) solids differ hugely in hardness and conductivity.
I keep getting “Kinetic molecular theory” questions wrong in States of Matter: Gases. What's the trap?
picturing gas molecules as touching or slow.
What does “Crystal field splitting” actually mean in Coordination Compounds, and why does it matter for NEET?
ligands split the metal's d-orbitals into two energy levels; electrons jumping between them absorb visible light, giving colour.
What does “Grignard reagent” actually mean in Haloalkanes & Haloarenes, and why does it matter for NEET?
R–MgX is a powerful nucleophile/base that builds C–C bonds, but it reacts violently with any water.
What does “Oxidation of alcohols” actually mean in Alcohols, Phenols & Ethers, and why does it matter for NEET?
primary alcohols oxidise to aldehydes then acids, secondary to ketones, and tertiary resist oxidation (no H on the carbon).
What does “Acidity of carboxylic acids” actually mean in Aldehydes, Ketones & Carboxylic Acids, and why does it matter for NEET?
carboxylic acids are more acidic than alcohols and phenols because the carboxylate ion spreads its charge over two equivalent oxygens.