NEET doubts
700 doubts found
What is the difference between K_c and K_p?
K_c uses molar concentrations; K_p uses partial pressures — they're related by K_p = K_c(RT)^Δn for gases.
How is Redox Reactions tested in NEET, and what should I focus on?
Prioritise the core ideas: Oxidation and reduction, Oxidation number, Oxidising and reducing agents.
What is the difference between atomic radius and ionization energy?
As atomic radius decreases across a period, ionization energy increases — smaller atoms hold their electrons more tightly.
What is the difference between order and molecularity?
Order is experimental and can be zero or fractional; molecularity is the count of species in an elementary step and is always a whole number.
What is the difference between galvanic cell and electrolytic cell?
A galvanic cell produces electricity from a spontaneous reaction; an electrolytic cell consumes electricity to force a non-spontaneous one.
What is the difference between electrophile and nucleophile?
An electrophile accepts an electron pair (e.g. H⁺, NO₂⁺); a nucleophile donates one (e.g. OH⁻, NH₃).
What is the difference between saturated hydrocarbon and unsaturated hydrocarbon?
Saturated means maximum hydrogens and only single bonds; unsaturated has double/triple bonds and fewer hydrogens.
What does “Osmosis” actually mean in Solutions & Colligative Properties, and why does it matter for NEET?
the net movement of solvent through a semipermeable membrane from a dilute (low-solute) side to a concentrated (high-solute) side.
What is the difference between Schottky defect and Frenkel defect?
A Schottky defect is a pair of missing cation+anion (lowers density); a Frenkel defect is an ion displaced to an interstitial site (density unchanged) — seen in ionic solids.
I keep getting “Real vs ideal gas behaviour” questions wrong in States of Matter: Gases. What's the trap?
assuming every gas obeys the ideal equation under all conditions.
What is the difference between monodentate ligand and chelating (polydentate) ligand?
A monodentate ligand donates one pair from one atom (NH₃); a chelating ligand grips the metal at several points (EDTA, ethylenediamine), forming an extra-stable ring.
What is the difference between polar protic solvent and polar aprotic solvent?
A polar protic solvent (water, alcohols) can hydrogen-bond, stabilising a carbocation, so it favours SN1; a polar aprotic solvent (acetone, DMSO) leaves the nucleophile free and reactive, so it favours SN2.
What is the difference between primary alcohol and tertiary alcohol?
A primary alcohol oxidises easily (to an aldehyde/acid) and reacts slowly in the Lucas test; a tertiary alcohol resists oxidation and reacts instantly in the Lucas test (via a stable carbocation).
What is the difference between aldehyde and ketone?
An aldehyde has the carbonyl at the end of the chain (at least one H on it) and is easily oxidised; a ketone has the carbonyl in the middle (two carbon groups) and resists mild oxidation.
What is the difference between aliphatic amine and aromatic amine (aniline)?
An aliphatic amine (e.g. methylamine) has a freely available lone pair and is more basic than ammonia; in aniline the lone pair delocalises into the ring, making it a much weaker base.
What is the difference between molarity and molality?
Molarity is per litre of solution (temperature-dependent); molality is per kg of solvent (temperature-independent).
What is the difference between shell and subshell?
A shell is a principal energy level (n); a subshell (s, p, d, f) is a division within a shell.
I keep getting “Hydrogen bonding” questions wrong in Chemical Bonding & Molecular Structure. What's the trap?
treating hydrogen bonds as ordinary covalent bonds.
What is the difference between exothermic reaction and endothermic reaction?
Exothermic releases heat (ΔH<0, surroundings warm); endothermic absorbs heat (ΔH>0, surroundings cool).
What is the difference between strong acid and weak acid?
A strong acid ionises completely (HCl); a weak acid ionises only partly (CH₃COOH) and has an equilibrium.
What are the most common mistakes students make in Redox Reactions?
Confusing oxidising and reducing agents, mixing up electron loss and gain, and misassigning oxidation numbers (e.g., thinking O₂ is –2).
What is the difference between metals and non-metals?
Metals lose electrons easily (low ionization energy, form cations); non-metals gain electrons (high electronegativity, form anions).
What is the difference between rate and rate constant?
Rate depends on concentration and changes as the reaction proceeds; the rate constant k is fixed at a given temperature.
What is the difference between anode and cathode?
Oxidation occurs at the anode and reduction at the cathode — in every cell, regardless of the terminal signs.