NEET · Chemistry doubts
126 doubts found
What does “VSEPR theory” actually mean in Chemical Bonding & Molecular Structure, and why does it matter for NEET?
electron pairs around a central atom arrange to be as far apart as possible, fixing the molecule's shape.
What does “Entropy (S)” actually mean in Chemical Thermodynamics, and why does it matter for NEET?
a measure of disorder or the number of ways energy can be arranged.
What does “Le Chatelier's principle” actually mean in Equilibrium, and why does it matter for NEET?
if you disturb a system at equilibrium, it shifts to oppose the change.
What does “Oxidation number” actually mean in Redox Reactions, and why does it matter for NEET?
a bookkeeping charge assigned by rules to track electron transfer.
What does “Ionization energy” actually mean in Periodic Table & Periodicity, and why does it matter for NEET?
the energy to remove the outermost electron; it rises across a period and falls down a group.
What does “Rate constant” actually mean in Chemical Kinetics, and why does it matter for NEET?
the proportionality constant k in the rate law; it rises sharply with temperature.
What does “Anode and cathode” actually mean in Electrochemistry, and why does it matter for NEET?
oxidation always happens at the anode and reduction always at the cathode.
What does “Resonance” actually mean in Organic Chemistry — Basic Concepts, and why does it matter for NEET?
delocalisation of electrons over several atoms, giving extra stability.
What does “Markovnikov's rule” actually mean in Hydrocarbons, and why does it matter for NEET?
when HX adds to an alkene, H attaches to the carbon that already has more hydrogens.
I keep getting “Molar mass” questions wrong in Some Basic Concepts (Mole Concept). What's the trap?
using atomic number instead of atomic mass to find molar mass.
I keep getting “Orbitals” questions wrong in Structure of Atom. What's the trap?
drawing fixed circular orbits (Bohr) instead of probability clouds.
I keep getting “VSEPR theory” questions wrong in Chemical Bonding & Molecular Structure. What's the trap?
counting only bonding pairs and ignoring lone pairs.
I keep getting “Entropy (S)” questions wrong in Chemical Thermodynamics. What's the trap?
thinking entropy always increases for the system alone.
I keep getting “Le Chatelier's principle” questions wrong in Equilibrium. What's the trap?
predicting the wrong direction of shift.
I keep getting “Oxidation number” questions wrong in Redox Reactions. What's the trap?
forgetting that oxidation number can be fractional or zero (e.g. in O₂, it's 0).
I keep getting “Ionization energy” questions wrong in Periodic Table & Periodicity. What's the trap?
ignoring small dips (e.g. B<Be, O<N) caused by sub-shell stability.
I keep getting “Rate constant” questions wrong in Chemical Kinetics. What's the trap?
thinking k depends on concentration.
I keep getting “Anode and cathode” questions wrong in Electrochemistry. What's the trap?
assuming the anode is always the positive terminal.
I keep getting “Resonance” questions wrong in Organic Chemistry — Basic Concepts. What's the trap?
believing the separate resonance structures actually exist and interconvert.
I keep getting “Markovnikov's rule” questions wrong in Hydrocarbons. What's the trap?
reversing it, except in the peroxide (anti-Markovnikov) effect.
What does “Limiting reagent” actually mean in Some Basic Concepts (Mole Concept), and why does it matter for NEET?
the reactant that runs out first and therefore caps how much product forms.
What does “Filling rules” actually mean in Structure of Atom, and why does it matter for NEET?
Aufbau (lowest energy first), Pauli (max two electrons, opposite spins) and Hund (singly fill before pairing).
What does “Hybridization” actually mean in Chemical Bonding & Molecular Structure, and why does it matter for NEET?
atomic orbitals mix to form equivalent hybrid orbitals (sp, sp², sp³) that set the geometry.
What does “Gibbs free energy” actually mean in Chemical Thermodynamics, and why does it matter for NEET?
ΔG = ΔH − TΔS decides spontaneity — negative ΔG means the process is spontaneous.