answers
Full explanation, worked examples & memory tricks in the app
Chemistry Exam Preparation
English 35 leveled MCQs Free
Shared by a Veda teacher · Generated with Veda AI
Smart notes
1
What you'll study, topic by topic
Solved paper preview
Sample questions with model answers
Every question in the paper gets a full exam-length answer in the app — organised by marks, the way a topper writes it.
7 marks Long answer
Determine the osmotic pressure of a solution prepared by dissolving 25 mg of K2SO4 in 2 L water at 25 °C, assuming that K2SO4 is completely dissociated.
Show answer outline
Osmotic pressure = 0.0067 atm.
The full exam-length answer is in the app.
5 marks Long answer
Write the reaction for the Williamson ether synthesis of 2-ethoxy-3-methyl pentane, starting from ethanol and 3-methylpentan-2-ol.
Show answer outline
Ethanol reacts with 3-methylpentan-2-ol in the presence of NaH to form 2-ethoxy-3-methylpentane.
The full exam-length answer is in the app.
5 marks Long answer
How will you convert benzaldehyde into benzophenone?
Show answer outline
Benzaldehyde can be converted to benzophenone via a Friedel-Crafts acylation reaction.
The full exam-length answer is in the app.
5 marks Long answer
Explain why the complex ion [Ti(H2O)6]^{3+} is coloured, based on Crystal Field Theory.
Show answer outline
The color arises from d-d transitions of electrons in the split d-orbitals due to ligand field.
The full exam-length answer is in the app.
5 marks Long answer
How is potassium permanganate prepared commercially? Also, give the structures of chromate and dichromate ions.
Show answer outline
Potassium permanganate is prepared by the oxidation of MnO2 with KMnO4; chromate is CrO4^{2-} and dichromate is Cr2O7^{2-}.
The full exam-length answer is in the app.
5 marks Long answer
Give equation for the preparation of phenol from cumene.
Show answer outline
Cumene is oxidized to cumene hydroperoxide, which decomposes to phenol and acetone.
The full exam-length answer is in the app.
4 marks Medium answer
Using Valence Bond Theory, explain the following in relation to the paramagnetic complex [NiCl4]^{2-}: c) Type of complex—whether inner orbital or outer orbital. Justify your answer.
Show answer outline
It is an outer orbital complex due to dsp^2 hybridization.
The full exam-length answer is in the app.
4 marks Medium answer
Calculate the mass of the compound (molar mass = 256 g mol^{-1}) to be dissolved in 75 g of benzene to lower its freezing point by 0.48 K. (Given: Kf of C6H6 = 5.12 K kg mol^{-1})
Show answer outline
Mass = 19.2 g.
The full exam-length answer is in the app.
4 marks Medium answer
Complete and balance the following equations: 1. Fe^{2+} + MnO4^{-} + H^{+} →
Show answer outline
The balanced equation is: 5Fe^{2+} + MnO4^{-} + 8H^{+} → 5Fe^{3+} + Mn^{2+} + 4H2O.
The full exam-length answer is in the app.
4 marks Medium answer
Complete and balance the following equations: 2. MnO4^{-} + H2O + I^{-} →
Show answer outline
The balanced equation is: MnO4^{-} + 8H2O + 5I^{-} → Mn^{2+} + 8OH^{-} + 5I2.
The full exam-length answer is in the app.
4 marks Medium answer
Explain the following named reactions: Swartz reaction.
Show answer outline
Swartz reaction involves the conversion of aryl halides to aryl fluorides using silver fluoride.
The full exam-length answer is in the app.
4 marks Medium answer
Explain the following named reactions: Sandmeyer's reaction.
Show answer outline
Sandmeyer's reaction involves the substitution of an aryl diazonium salt with halides using copper salts.
The full exam-length answer is in the app.
4 marks Medium answer
Explain the following named reactions: Reimer-Tiemann reaction.
Show answer outline
Reimer-Tiemann reaction involves the ortho-formylation of phenols using chloroform and a base.
The full exam-length answer is in the app.
4 marks Medium answer
What is meant by hydroboration-oxidation reaction? Illustrate with an example.
Show answer outline
Hydroboration-oxidation converts alkenes to alcohols; e.g., ethene to ethanol.
The full exam-length answer is in the app.
4 marks Medium answer
Account for the following: Zn^{2+} salts are colourless while Ni^{2+} salts are coloured.
Show answer outline
Zn^{2+} has a full d-orbital, while Ni^{2+} has unpaired electrons causing color.
The full exam-length answer is in the app.
4 marks Medium answer
Write the ionic equation for the oxidizing action of MnO4^- in acidic medium with: Fe^{2+} ion.
Show answer outline
The equation is: MnO4^{-} + 8H^{+} + 5Fe^{2+} → Mn^{2+} + 4H2O + 5Fe^{3+}.
The full exam-length answer is in the app.
4 marks Medium answer
Complete the following equations: MnO2 + KOH + O2 →
Show answer outline
The balanced equation is: 2MnO2 + 4KOH + O2 → 2K2MnO4 + 2H2O.
The full exam-length answer is in the app.
4 marks Medium answer
Complete the following equations: Cr2O7^{2-} + 14H^{+} + 6I^{-} →
Show answer outline
The balanced equation is: Cr2O7^{2-} + 14H^{+} + 6I^{-} → 2Cr^{3+} + 7H2O + 3I2.
The full exam-length answer is in the app.
3 marks Medium answer
Using Valence Bond Theory, explain the following in relation to the paramagnetic complex [NiCl4]^{2-}: a) Type of hybridization.
Show answer outline
The hybridization is dsp^2.
The full exam-length answer is in the app.
3 marks Medium answer
Using Valence Bond Theory, explain the following in relation to the paramagnetic complex [NiCl4]^{2-}: b) Magnetic moment value.
Show answer outline
The magnetic moment value is 2.83 BM.
The full exam-length answer is in the app.
3 marks Medium answer
Illustrate the following reaction with a suitable chemical equation: a) Cannizzaro reaction.
Show answer outline
The reaction is: 2RCHO → RCOO^- + RCH2OH.
The full exam-length answer is in the app.
3 marks Medium answer
In 3d series, Mn exhibits highest oxidation state while in 4d and 5d, Ru and Os have highest oxidation state. What is the highest oxidation state shown among the given elements?
Show answer outline
The highest oxidation state is +7.
The full exam-length answer is in the app.
3 marks Medium answer
Vanadium has the ability to exhibit various oxidation states. How do you explain this?
Show answer outline
Vanadium can exhibit various oxidation states due to its ability to lose different numbers of electrons.
The full exam-length answer is in the app.
3 marks Medium answer
Account for the following: Propanol has a higher boiling point than that of the hydrocarbon butane.
Show answer outline
Propanol has hydrogen bonding, which increases its boiling point compared to butane.
The full exam-length answer is in the app.
3 marks Medium answer
Account for the following: o-Nitrophenol is more acidic than o-methoxyphenol.
Show answer outline
o-Nitrophenol is more acidic due to the electron-withdrawing effect of the nitro group.
The full exam-length answer is in the app.
3 marks Medium answer
Account for the following: The dipole moment of chlorobenzene is lower than that of cyclohexyl chloride.
Show answer outline
Chlorobenzene has a planar structure, while cyclohexyl chloride has a non-planar structure leading to a higher dipole moment.
The full exam-length answer is in the app.
3 marks Medium answer
Write the equation involved in the preparation of KMnO4 from pyrolusite ore.
Show answer outline
The reaction is: 4MnO2 + 4KOH + O2 → 4KMnO4 + 2H2O.
The full exam-length answer is in the app.
2 marks Short answer
What happens when n-butyl chloride is treated with alcoholic KOH?
Show answer outline
n-butyl chloride undergoes elimination to form butene.
The full exam-length answer is in the app.
2 marks Short answer
Give the products of the following reaction: C6H5CH2OC6H5 + HI → ?
Show answer outline
The products are C6H5I and CH3I.
The full exam-length answer is in the app.
2 marks Short answer
Give a chemical test to distinguish between benzaldehyde and acetophenone.
Show answer outline
Use 2,4-DNP test; benzaldehyde gives a yellow precipitate, while acetophenone gives a red precipitate.
The full exam-length answer is in the app.
2 marks Short answer
What happens when methyl bromide is treated with sodium in the presence of dry ether?
Show answer outline
A Wurtz reaction occurs, forming butane.
The full exam-length answer is in the app.
2 marks Short answer
What happens when ethyl chloride is treated with aqueous KOH?
Show answer outline
Ethyl chloride undergoes hydrolysis to form ethanol.
The full exam-length answer is in the app.
2 marks Short answer
Cr^{2+} is a strong reducing agent.
Show answer outline
Cr^{2+} readily loses electrons to form Cr^{3+}.
The full exam-length answer is in the app.
2 marks Short answer
Transition metals form complex compounds.
Show answer outline
Transition metals have vacant d-orbitals that can accept electron pairs from ligands.
The full exam-length answer is in the app.
1 marks Short answer
State Henry's law.
Show answer outline
At a constant temperature, the amount of gas dissolved in a liquid is directly proportional to the partial pressure of the gas above the liquid.
The full exam-length answer is in the app.
Study it properly — free, in the app
The full Veda Bites deck, complete notes, spaced-repetition flashcards, leveled MCQs, tests and games for this kit — plus Daily Facts and the Arena, every day.