Chemistry All India Set 2 C 2015-2016 Commerce (English Medium) Class 12 Question Paper Solution

Write the IUPAC name of the given compound:

Write the structure of an isomer of compound C₄H₉Br which is most reactive towards S_N1 reaction

What is the reason for the stability of colloidal sols?

Give an example each of a molecular solid and an ionic solid.

Pb(NO₃)₂ on heating gives a brown gas which undergoes dimerisation on cooling? Identify the gas

For a reaction: 

Rate = k

(i) Write the order and molecularity of this reaction.

(ii) Write the unit of k.

Write the chemical equation involved in the following reaction:

Hoffmann-bromamide degradation reaction

Write the chemical equations involved in the following reactions:

Carbylamine reaction

Gas (A) is more soluble in water than Gas (B) at the same temperature. Which one of the two gases will have the higher value of KH (Henry’s constant) and why

In non-ideal solution, what type of deviation shows the formation of maximum boiling azeotropes?

When a coordination compound CoCl₃.6NH₃ is mixed with AgNO₃, 3moles of AgCl are precipitated per mole of the compound. Write

(i) Structural formula of the complex

When a coordination compound CoCl₃.6NH₃ is mixed with AgNO₃, 3moles of AgCl are precipitated per mole of the compound. Write (ii) IUPAC name of the complex

Draw the structures of the following molecules: BrF₃

Draw the structures of the following molecules: XeF₄

What happens when: SO₂ gas is passed through an aqueous solution Fe⁺³ salt?

What happens when: XeF₄ reacts with SbF₅?

Write the final product(s) in each of the following reactions:

Write the final product(s) in each of the following reactions:

Write the final product(s) in each of the following reactions:

How do you convert: Chlorobenzene to biphenyl

How do you convert: Propene to 1-iodopropane

How do you convert: 2-bromobutane to but-2-ene

Write the major products(s) in the following:

Write the major products(s) in the following:

Write the major products(s) in the following:

Write the structural difference between starch and cellulose.

What type of linkage is present in nucleic acids?

Give one example each for fibrous protein and globular protein.

Name the method used for the refining of Nickel metal.

What is the role of cryolite in the extraction of aluminium?

What is the role of limestone in the extraction of iron from its oxides?

Give reasons: SO₂ is reducing while TeO₂ is an oxidising agent.

Nitrogen does not form pentahalide.

ICl is more reactive than I₂.

For the complex [Fe(H₂O)₆]+3, write the hybridisation, magnetic character and spin of the complex. (At, number : Fe = 26)

Draw one of the geometrical isomers of the complex [Pt (en)₂Cl₂] ⁺² which is optically inactive

An element crystallises in a b.c.c lattice with cell edge of 500 pm. The density of the element is 7.5g cm^-3. How many atoms are present in 300 g of the element?

What is the role of sulphur in the vulcanisation of rubber?

Identify the monomers in the following polymer:

Arrange the following polymers in the Increasing order of their intermolecular forces:

Terylene, Polythene, Neoprene

For the first order thermal decomposition reaction, the following data were obtained:

Time / sec               Totalpressure / atm

0                              0.30

300                          0.50

Calculate the rate constant

(Given: log 2 = 0.301, log3 = 0.4771, log 4 = 0.6021)

Give reasons for the following:

Aniline does not undergo Friedel- Crafts reaction.

Give reasons for the following: (CH₃)₂NH is more basic than (CH₃)₃N in an aqueous solution.

Give reason for the following:

Primary amines have higher boiling point than tertiary amines.

Define the following terms: Lyophilic colloid

Define the following term:

Zeta potential

Define the following terms: Associated colloids

Calculate the boiling point of solution when 4g of MgSO₄ (M= 120 g mol^-1) was dissolved in 100g of water, assuming MgSO4 undergoes complete ionization. (K_b for water = 0.52 K kgmol^-1)

Due to hectic and busy schedule, Mr Angad made his life full of tensions and anxiety. He started taking sleeping pills to overcome the depression without consulting the doctor. Mr Deepak, a close friend of Mr. Angad advised him to stop taking sleeping pills and suggested to change his life lifestyle by doing yoga, meditation and some physical exercise. Mr. Angad followed his friend’s advice and after few days he started feeling better.

After reading the above passage, answer the following

(i) What are the values (at least two) displayed by Mr. Deepak?

(ii) Why is it not advisable to take sleeping pills without consulting doctor?

(iii) What are tranquilisers? Give two examples.

Write the structures of A and B in the following reactions:

Write the structures of A and B in the following reactions

Distinguish between:

C₆H₅-COCH₃ and C₆H₅-CHO

Distinguish between: CH3COOH and HCOOH

Arrange the following in the increasing order of their boiling points: CH₃CHO, CH₃COOH, CH₃CH₂OH

Write the chemical reaction involved in Wolff-Kishner reduction.

Arrange the following in the increasing order of their reactivity towards nucleophilic addition reaction:

C₆H₅COCH₃, CH₃-CHO, CH₃COCH₃

Why carboxylic acid does not give reactions of carbonyl group?

Write the product in the following reaction

A and B are two functional isomers of compound C₃H₆O.On heating with NaOH and I₂, isomer B forms yellow precipitate of iodoform whereas isomer A does not form any precipitate. Write the formulae of A and B.

Calculate E°_cell for the following reaction at 298 K:

2Al_(s) + 3Cu⁺²(0.01M) → 2Al⁺³(0.01M) + 3Cu_(s)

Given: E_cell = 1.98V

Using the E° values of A and B, predict which is better for coating the surface of iron [E°(Fe⁺²/Fe) = -0.44V] to prevent corrosion and why?

Given: E° (A⁺²/A)=-2.37 V: E°(B⁺²/B)= -0.14V

The conductivity of 0.001 mol L-1 solution of CH₃COOH is 3.905× 10-5 S cm-1. Calculate its molar conductivity and degree of dissociation (α) Given λ°(H⁺)= 349.6 S cm² mol-1 and λ°(CH₃COO)= 40.9S cm²mol^-1.

Define electrochemical cell

What happens if external potential applied becomes greater than E°cell of electrochemical cell?

Account for the following:

Mn shows the highest oxidation state of +7 with oxygen but with fluorine, it shows oxidation state of +4.

Account for the following: 

Cr²⁺ is a strong reducing agent.

Account for the following:

Cu⁺² salts are coloured, while Zn²⁺ salts are white.

Complete the following equations:

Complete the following equations: Cr₂O₇^2- + 14H⁺ + 6I →

The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co

Answer the following: Write the element which shows maximum number of oxidation states. Give reason.

The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co

Answer the following: Which element has the highest m.p?

The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co

Answer the following: Which element shows only +3 oxidation state?

The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co

Answer the following: Which element is a strong oxidising agent in +3 oxidation state and why?