Chemistry Delhi Set 3 2016-2017 Commerce (English Medium) Class 12 Question Paper Solution

What is the effect of catalyst on: Gibbs energy (∆G)

What is the effect of catalyst on activation energy of a reaction?

Write one similarity between Physisorption and Chemisorption

Write the formula of an oxo-anion of Manganese (Mn) in which it shows the oxidation state equal to its group number.

Write the structure of 3-Bromo-2-methylprop-1-ene

Write IUPAC name of the following compound (CH₃)₂ N − CH₂CH₃

Write the reactions involved in the following reactions: Clemmensen reduction

Write the chemical equations to illustrate the following name reaction: 

Cannizzaro’s reaction

Draw the structures of the following: H₄P₂O₇ (Pyrophosphoric acid)

Write the structures of the following molecules: XeOF₄

Define the term Abnormal molar mass

Define van’t Hoff factor.

Calculate the degree of dissociation (α) of acetic acid if its molar conductivity (Λ_m) is 39.05 S cm² mol⁻¹.

Given λ^°(H⁺) = 349.6 S cm² mol⁻¹ and λ^°(CH₃COO⁻) = 40.9 S cm² mol⁻¹

Complete the given chemical equations 

`F_2 + 2Cl^(-)`

Complete the given chemical equations:

`2XeF_2 + 2H_2O->`

What happens when HCl is added to MnO₂? Write the equations involved

What happens when PCl₅ is heated? Write the equations involved.

Give reasons  Acetylation of aniline reduces its activation effect.

Give reasons CH₃NH₂ is more basic than C₆H₅NH₂.

Give reasons  Although –NH₂ is o/p directing group, yet aniline on nitration gives a significant amount of m-nitroaniline

Give reasons Thermal stability decreases from H₂O to H₂Te.

Give reasons Fluoride ion has higher hydration enthalpy than chloride ion.

Account for the following : Nitrogen does not form pentahalide.

Explain the following terms with suitable examples - Anionic detergents

Define Broad-spectrum antibiotics with a suitable example?

Explain Tranquilizers

Write the names and structures of the monomers of the following polymers: Nylon-6

Write the structures of the monomers used for getting the following polymers

Melamine – formaldehyde polymer

Write the names of monomers used for getting the following polymers:

Teflon

Write structures of compounds A, B and C in of the following reactions

Write structures of compounds A, B and C in of the following reactions

How will you bring about the following conversion in not more than two steps?

Benzoic acid to Benzaldehyde

Do the following conversions in not more than two steps :

Ethyl benzene to Benzoic acid

Do the following conversions in not more than two steps :

Propanone to Propene

Name the method of refining of metals such as Germanium.

Out of PbS and PbCO₃ (ores of lead), which one is concentrated by froth floatation process preferably?

What is the significance of leaching in the extraction of aluminium?

Following compounds are given to you :

2-Bromopentane, 2-Bromo-2-methylbutane, 1-Bromopentane

1) Write the compound which is most reactive towards S_N2 reaction.

2) Write the compound which is optically active.

3)  Write the compound which is most reactive towards β-elimination reaction. 

Following data are obtained for reaction :

N₂O₅ → 2NO₂ + 1/2O₂

1) Show that it follows first order reaction.

2) Calculate the half-life.

(Given log 2 = 0.3010, log 4 = 0.6021)

Write one difference between Multimolecular colloid and Macromolecular colloid

Write one difference between Sol and Gel

Write one difference between O/W emulsion and W/O emulsion

What type of isomerism is shown by the complex [Co(en)₃]Cl₃

Write the hybridisation and magnetic character of [Co(C₂O₄)₃]^3–.

(At. no. of Co = 27)

Write IUPAC name of the following Complex [Cr(NH₃)₃Cl₃]

Calculate the mass of Ag deposited at cathode when a current of 2 amperes was passed through a solution of AgNO₃ for 15 minutes.

(Given : Molar mass of Ag = 108 g mol⁻¹ lF = 96500 C mol⁻¹)

Define terms: Fuel cell

A 10% solution (by mass) of sucrose in water has freezing point of 269.15 K. Calculate the freezing point of 10% glucose in water, if freezing point of pure water is 273.15 K

Given : (Molar mass of sucrose = 342 g mol⁻¹)

(Molar mass of glucose = 180 g mol⁻¹)

After watching a programme on TV about the presence of carcinogens (cancer causing agents) Potassium bromate and Potassium iodate in bread and other bakery products, Ritu a class XII student decided to aware others about the adverse effects of these carcinogens in foods. She consultanted the school principal and requested him to instruct canteen contractor to stop selling sandwiches, pizza, burgers and other bakery products to the students. Principal took an immediate action and instructed the canteen contractor to replace the bakery products with some proteins and vitamins rich food like fruits, salads, sprouts etc. The decision was welcomed by the parents and students.

After reading the above passage, answer the following questions:

1) What are the values (at least two) displayed by Ritu?

2) Which polysaccharide component of carbohydrates is commonly present in bread?

3) Write the two types of secondary structure of proteins.

4) Give two examples of water soluble vitamins.

An element has atomic mass 93 g mol^–1 and density 11.5 g cm^–3. If the edge length of its unit cell is 300 pm, identify the type of unit cell

Write any two differences between amorphous solids and crystalline solids

Calculate the number of unit cells in 8.1 g of aluminium if it crystallizes in a f.c.c. structure. (Atomic mass of Al = 27 g mol^–1)

Give reasons : In stoichiometric defects, NaCl exhibits Schottky defect and not Frenkel defect.

Give reasons : Silicon on doping with Phosphorous forms n-type semiconductor.

Give reasons:Ferrimagnetic substances show better magnetism than antiferromagnetic substances.

Write the product(s) in the following reactions

Write the product(s) in the following reactions

Write the product(s) in the following reaction

Give simple chemical tests to distinguish between the following pairs of compounds :

Ethanol and phenol

Give simple chemical tests to distinguish between the following pairs of compounds :

Propanol and 2-methylpropan-2-ol

Write the formula of reagents used in the following reactions :

Bromination of phenol to 2,4,6-tribromophenol

Write the formula of reagents used in the following reactions :

Hydroboration of propene and then oxidation to propanol.

Arrange the following compound groups in the increasing order of their property indicated :

p-nitrophenol, ethanol, phenol (acidic character)

Arrange the following compound groups in the increasing order of their property indicated :

Propanol, Propane, Propanal (boiling point)

Write the mechanism (using curved arrow notation) of the following reaction :

How would you account for the following: Transition metals form complex compounds.

Give an example and suggest a reason for the following feature of the transition metal chemistry:

The lowest oxide of transition metal is basic, the highest is amphoteric/acidic.

Account for the following:

E° value for the Mn³⁺/Mn²⁺ couple is highly positive (+1.57 V) as compare to Cr³⁺/Cr²⁺.

Write one similarity and one difference between the chemistry of lanthanoid and actinoid elements.

How is the variability in oxidation states of transition metals different from that of the non-transition metals? Illustrate with examples.

Explain why Cu⁺ ion is not stable in aqueous solutions?

Orange colour of `Cr_2O_7^(2–)` ion changes to yellow when treated with an alkali. Why?

How would you account for the following:

The chemistry of actinoids is more complicated as compared to lanthanoids.