NEET · Chemistry doubts
126 doubts found
What does “Equilibrium constant” actually mean in Equilibrium, and why does it matter for NEET?
K compares products to reactants at equilibrium; a large K means products are favoured.
What does “Oxidising and reducing agents” actually mean in Redox Reactions, and why does it matter for NEET?
the oxidising agent gets reduced (gains electrons); the reducing agent gets oxidised (loses electrons).
What does “Electronegativity” actually mean in Periodic Table & Periodicity, and why does it matter for NEET?
an atom's tendency to attract shared electrons; fluorine is the highest.
What does “Activation energy” actually mean in Chemical Kinetics, and why does it matter for NEET?
the minimum energy barrier reactants must cross; a catalyst lowers it.
What does “Electrode potential” actually mean in Electrochemistry, and why does it matter for NEET?
the tendency of an electrode to gain electrons; cell EMF = E(cathode) − E(anode).
What does “Electrophiles and nucleophiles” actually mean in Organic Chemistry — Basic Concepts, and why does it matter for NEET?
electrophiles are electron-poor (seek electrons); nucleophiles are electron-rich (donate electrons).
What does “Aromaticity” actually mean in Hydrocarbons, and why does it matter for NEET?
extra stability of planar, cyclic, fully-conjugated rings with (4n+2) pi electrons (benzene).
I keep getting “Limiting reagent” questions wrong in Some Basic Concepts (Mole Concept). What's the trap?
assuming the reactant with the smaller mass is limiting.
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.
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).