Chemistry ICSE XII Prep Quiz

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Essential topics recap

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Kalpana Shukla

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Chemistry ICSE XII Prep Quiz


Chemistry ICSE XII Prep QuizVersión en línea Essential topics recap por Kalpana Shukla 1 Osmotic pressure depends on which factor? Choose one or more answers a The solubility of solute b The volume of solvent only c The number of moles of solute in a given solvent volume d The nature of the solute e 2 For a first-order reaction, what happens to the rate if the reactant concentration is doubled? a The rate doubles b The rate increases by a factor of four c The rate remains the same d The rate halves 3 In phenol, the –OH group attaches to a carbon with what hybridisation? And how does C–O bond length compare to methanol? a sp2; shorter than in methanol b sp2; longer than in methanol c sp3; same as in methanol d sp3; longer than in methanol 4 During nitration of benzene with conc. H2SO4 and HNO3, which species initiates the reaction? a H2O b SO3 c Cl+ d NO2+ (nitronium ion) 5 Which test distinguishes an aldehyde with an alpha hydrogen (like acetaldehyde) from benzaldehyde? a Tollens’ reagent test b Fehling’s solution test c Iodoform test d Benedict’s test 6 Calculate E°cell for Cu/Cu2+ // Ag+/Ag with given concentrations. E°cell = 0.46 V. If [Cu2+]=0.025 M and [Ag+]=0.005 M, what is Ecell? a Approximately 0.439 V b Approximately 0.60 V c Approximately 0.50 V d Approximately 0.30 V 7 Which reaction demonstrates a Wurtz reaction? a Fischer esterification b Hydrohalogenation of alkenes c Coupling of alkyl halides with sodium metal to form a higher alkane d Hydrogenation of alkenes 8 Which statement is true about Ti3+ and Ti4+ salts? a Ti3+ salts are colored; Ti4+ salts are colorless b Ti3+ is colorless; Ti4+ is colored c Ti3+ and Ti4+ have identical colors d Both are always colored 9 Define osmotic pressure in terms of molar mass and temperature. (Basic form) a Π = k × mass b Π = PV/RT c Π = (n/V)RT where n is moles of solute d Π depends only on solvent 10 Name the intermolecular isomerism where coordination complexes show different linkage forms. a Stereoisomerism b Geometric isomerism c Ionization isomerism d Linkage isomerism Feedback 1 Osmotic pressure is a colligative property depending on particle count, not chemical nature. 2 First-order rate ∝ concentration, so doubling C doubles rate. 3 Phenol’s OH is attached to an sp2 carbon; C–O is slightly shorter due to resonance. 4 NO2+ is the electrophile that attacks the benzene ring. 5 Iodoform tests for CH3-CO- or CH3- in aldehydes; benzaldehyde is negative. 6 Using E = E° − (0.05916/2) log([Cu2+]/[Ag+]); Q=5 gives ≈0.439 V. 7 Wurtz reaction forms C–C bonds via radical coupling with Na. 8 Ti3+ is a d1/d2 depending on oxidation; Ti4+ has empty d-orbitals, typically colorless. 9 Osmotic pressure is a colligative property depending on solute moles, volume, T. 10 Linkage isomerism occurs when ligands bind through different atoms (e.g., NO2 vs NNO2).

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Chemistry ICSE XII Prep Quiz

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Chemistry ICSE XII Prep QuizVersión en línea

por Kalpana Shukla

Osmotic pressure depends on which factor?

Choose one or more answers

For a first-order reaction, what happens to the rate if the reactant concentration is doubled?

In phenol, the –OH group attaches to a carbon with what hybridisation? And how does C–O bond length compare to methanol?

During nitration of benzene with conc. H2SO4 and HNO3, which species initiates the reaction?

Which test distinguishes an aldehyde with an alpha hydrogen (like acetaldehyde) from benzaldehyde?

Calculate E°cell for Cu/Cu2+ // Ag+/Ag with given concentrations. E°cell = 0.46 V. If [Cu2+]=0.025 M and [Ag+]=0.005 M, what is Ecell?

Which reaction demonstrates a Wurtz reaction?

Which statement is true about Ti3+ and Ti4+ salts?

Define osmotic pressure in terms of molar mass and temperature. (Basic form)

Name the intermolecular isomerism where coordination complexes show different linkage forms.

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