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chemistry cbse 2017

Chemistry CBSE2017

ExamYear 2017

Study, Assignments, Solved Previous Year Papers . Questions and Answers. FreeForever.

Short AnswerType

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

Answer

For a reaction R → P, half-life (t1/2) is observed to be independent of the initial concentration of reactants. What is the order ofreaction?

Answer

Write one similarity between Physisorption andChemisorption?

Answer

Complete the following reactions : NH3 + 3Cl2(excess)→

Answer

Complete the following reactions : XeF6 + 2H2O→

Answer

What happens when (NH4)2Cr2O7 isheated?

Answer

What happens when H3PO3 isheated?

Answer

Define the following terms: Colligativeproperties

Answer

Define the following terms: Molality(m)

Answer

Draw the structures of the following:

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chemistry cbse 2017 1

Chemistry CBSE2017

ExamYear 2017

Study, Assignments, Solved Previous Year Papers . Questions and Answers. FreeForever.

H2S2O7

Answer

Draw the structures of the following : XeF6

Answer

Calculatethedegreeofdissociation(a)ofaceticacidifitsmolarconductivity(Λ)is39.05S cm2mol–1.

m

Givenλo = 349.6 S cm2 mol–1andλo = 40.9 S cm2 mol–1 (H+) (CH3COO–)

Answer

A 10% solution (by mass) of sucrose in water has the freezing point of 269.15 K.Calculate the freezing point of10%glucoseinwateriffreezingpointofpurewateris273.15K.

Given:(Molarmassofsucrose=342gmol–1)(Molarmassofglucose=180gmol–1)

Answer

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

(Given : Molar mass of Ag = 108 g mol–1 1F = 96500 Cmol–1)

Answer

Define fuelcell.

Answer

What type of isomerism is shown by the complex [Co(NH3)6][Cr(CN)6]?

Answer

Why a solution of [Ni(H O) ]2+ is green while a solution of [Ni(CN) ]2– is colourless? (At. no. of Ni =28)

2 6 4

Answer

Write the IUPAC name of the following complex :[Co(NH3)5(CO3)]Cl.

Answer

Write one difference in each of the following : Lyophobic sol and Lyophilicsol

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chemistry cbse 2017 2

Chemistry CBSE2017

ExamYear 2017

Study, Assignments, Solved Previous Year Papers . Questions and Answers. FreeForever.

Answer

Write one difference in each of the following: Solution andColloid

Answer

Write one difference in each of the following : Homogeneous catalysis and Heterogeneouscatalysis

Answer

Following data are obtained for the reaction : N2O5 → 2NO2 +½O2

t/s

300

600

0

–1 –2 –2 –2

[N2O5]/mol L 1.6 × 10 0.8 × 10 0.4 ×10

Show that it follows first orderreaction.

Calculate thehalf-life.

(Given log 2 = 0.3010 log 4 =0.6021)

Answer

Writetheprincipleofthemethodusedfortherefiningofgermanium.

Answer

OutofPbSandPbCO3(oresoflead),whichoneisconcentratedbyfrothflotationprocesspreferably?

Answer

Answer

Givereasons:

Thermal stability decreases from H2O toH2Te.

Answer

Givereasons:

Fluorideionhashigherhydrationenthalpythanchlorideion.

Answer

Givereasons:

Nitrogen does not formpentahalide.

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chemistry cbse 2017 3

Chemistry CBSE2017

ExamYear 2017

Study, Assignments, Solved Previous Year Papers . Questions and Answers. FreeForever.

Answer

Account for the following:

Transition metals form large number of complexcompounds.

Answer

Account for the following:

The lowest oxide of transition metal is basic whereas the highest oxide is amphoteric oracidic.

Answer

Account for the following:

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

Answer

Writeonesimilarityandonedifferencebetweenthechemistryoflanthanoidandactinoidelements.

Answer

Howisthevariabilityinoxidationstatesoftransitionmetalsdifferentfromthatofthep-blockelements?

Answer

OutofCu+andCu2+,whichionisunstableinaqueoussolutionandwhy?

Answer

The Orange colour of Cr O 2– ion changes to yellow when treated withan

27

alkali. Why?

Answer

Chemistry of actinoids is complicated as compared to lanthanoids. Give tworeasons.

Answer

An element has atomic mass 93 g mol–1 and density 11.5 g cm–3. If the edge thelengthofitsunitcellis300pm,identifythetypeofunitcell.

Answer

Writeanytwodifferencesbetweenamorphoussolidsandcrystallinesolids.

Answer

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chemistry cbse 2017 4

Chemistry CBSE2017

ExamYear 2017

Study, Assignments, Solved Previous Year Papers . Questions and Answers. FreeForever.

39.Calculatethenumberofunitcellsin8.1gofaluminiumifitcrystallizesina

f.c.c. structure. (Atomic mass of Al = 27 gmol–1)

Answer

Give reasons:

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

Answer

Give reasons:

SiliconondopingwithPhosphorusformsthen-typesemiconductor.

Answer

Givereason:

Ferrimagnetic substances show better magnetism than antiferromagnetic substances.

Answer

Write IUPAC name of the following compound : (CH3CH2)2NCH3

Answer

Write the structure of1-Bromo-4-chlorobut-2-ene.

Answer

Write the equations involved in the following reactions : Wolff-Kishnerreduction

Answer

Write the equations involved in the following reactions : Etardreaction

Answer

Following compounds are given to you:

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

Write the compound which is most reactive towards SN2reaction.

Write the compound which is opticallyactive.

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chemistry cbse 2017 5

Chemistry CBSE2017

ExamYear 2017

Study, Assignments, Solved Previous Year Papers . Questions and Answers. FreeForever.

(iii)Writethecompoundwhichismostreactivetowardsb-eliminationreaction.

Answer

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

Answer

49. WritestructuresofcompoundsA,BandC ineachofthefollowingreactions

Answer

Do the following conversions in not more than two steps : Benzoic acid tobenzaldehyde

Answer

Do the following conversions in not more than two steps : Ethyl benzene to Benzoicacid

Answer

Do the following conversions in not more than two steps : Propanone toPropene

Answer

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

Answer

Write the structures of the monomers used for getting the following polymers: Melamine – formaldehydepolymer

Answer

Write the structures of the monomers used for getting the following polymers: Buna-N

Answer

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chemistry cbse 2017 6

Chemistry CBSE2017

ExamYear 2017

Study, Assignments, Solved Previous Year Papers . Questions and Answers. FreeForever.

  • Define the following:
  • Anionicdetergents
  • Answer
  • Define the following : Broad spectrumantibiotics
  • Answer
  • Define the following : Antiseptic
  • Answer
  • Givereasons:
  • Acetylation of aniline reduces its activationeffect.
  • Answer
  • Give reasons:
  • CH3NH2 is more basic thanC6H5NH2.
  • Answer
  • Give reasons:
  • Although –NH2 is o/p directing group, yet aniline on nitration gives a significant amount ofm-nitroaniline.
  • Answer
  • After watching a programme on TV about the presence of carcinogens(cancercausing
  • 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 consulted 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 andstudents.
  • Afterreadingtheabovepassage,answerthefollowingquestions:
    • Whatarethevalues(atleasttwo)displayedbyRitu?
    • Which polysaccharide component of carbohydrates is commonly present inbread?
    • Writethetwotypesofsecondarystructureofproteins.
    • Give two examples of water solublevitamins.

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chemistry cbse 2017 7

Chemistry CBSE2017

ExamYear 2017

Study, Assignments, Solved Previous Year Papers . Questions and Answers. FreeForever.

Answer

63. Write the product(s) in the followingreactions:

Answer

64. Write the product(s) in the followingreactions:

Answer

65. Write the product(s) in the followingreactions:

Answer

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

Ethanol andPhenol

Answer

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

Propanol and2-methylpropan-2-ol

Answer

Write the formula of reagents used in the following reactions : Bromination of phenol to2,4,6-tribromophenol

Answer

Write the formula of reagents used in the following reactions : Hydroborationofpropeneandthenoxidationtopropanol.

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chemistry cbse 2017 8

Chemistry CBSE2017

ExamYear 2017

Study, Assignments, Solved Previous Year Papers . Questions and Answers. FreeForever.

Answer

Arrange the following compound groups in the increasing order of their property indicated : p-nitrophenol, ethanol, phenol (acidiccharacter)

Answer

Arrange the following compound groups in the increasing order of their property indicated : Propanol, Propane, Propanal (boilingpoint)

Answer

Writethemechanism(usingcurvedarrownotation)ofthefollowingreaction:

Answer

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