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XII-Boards-MODEL SAMPLE PAPER-Chem
Tarin Bansal
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9 Jan 2008 00:02:26 IST
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9 Jan 2008 00:02:26 IST
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XII-Boards-MODEL SAMPLE PAPER-Chem
, Course Material and Coaching
SET-1
Time Allotted: 03:00:00
 Maximum Marks: 70
 
1.All questions are compulsory.
 
2.Marks for each question are indicated against it.
3.Question numbers 1 to 8 are very short-answer questions each of 1 mark. Answer them in about one sentence each.
4.Question numbers 9 to 18 are short-answer questions of 2 marks each. Answer them in not more than 30 words each.
5.Question numbers 19 to 27 are short-answer questions of 3 marks each. Answer them in not more than 40 words each.
6.Question numbers 28 and 30 are long-answer questions of 5 marks each. Answer them in not more than 70 words each.
7.Use Log Tables, If necessary.
8. Please give the explanation for the answer where applicable.
9. To view the answer, click on the Answer link alongside the Question.
 
Q 1)Write IUPAC name of phenetole.  1 Marks
 
Q 2)An element is found to have fcc structure. How many atoms are present in its one unit cell?   1 Marks
 
Q 3)Name the poisonous gas which chloroform produces on reaction with air and oxygen.  1 Marks
 
Q 4)Name an experiment/ property which confirms the heterogeneous nature of colloidal solutions.  1 Marks
 
Q 5)Predict the shape of XeO3 on the basis of VSEPR theory.  1 Marks
 
Q 6)Give one use of reverse osmosis.  1 Marks
 
Q 7)Why does CaO react with SiO2 to form a slag?  1 Marks
 
Q 8)Write a balanced chemical equation for reaction between chlorine and excess of ammonia.  1 Marks
 
Q 9)Calculate the freezing point of a solution containing 50.0 g of ethylene glycol (Molecular weight =62) dissolved in 600 g of water. (Kf for    water=1.86 K kg mol-1)  2 Marks
 
Q 10)(i) A reaction follows second order kinetics. How is the rate of reaction affected if the concentration of the reactant is reduced to half?
(ii) The rate constant of a reaction is 6.0 x 10-4 s-1. Find the order of the reaction.  2 Marks
 
Q 11)What is vapour phase refining? What are the necessary requirements for the compound to be purified by vapour phase refining?  2 Marks
 
Q 12)(i) Write basic constituents of a nucleotide.
(ii) Name the nitrogenous base which is present in RNA and not found in DNA.  2 Marks
 
Q 13)(i) What is the name given to the linkage which holds together two monosaccharide units in a polysaccharide?
(ii) Name a polysaccharide found in animals.  2 Marks
 
Q 14)(i) In Williamson synthesis why the yield of ether is not good with 2º and 3º alkyl halides?
(ii) Explain why the alkoxy group is ortho, para directing?  2 Marks
 
Q 15)(i) What is diazotization?

(ii) Identify and write the names of (X), (Y) and (Z)    2 Marks
 
Q 16)Convert
(i) Propanal to butanone
(ii) Propanone to iodoform.  2 Marks
 
Q 17)Write balance chemical reactions and name of the major product for the following
(i) Ethylamine reacts with nitrous acid.
(ii) Benzene diazonium chloride reacts with ethyl alcohol.  2 Marks
 
OR

Convert Ethanoic acid into Methanamine.  2 Marks
 
Q 18)Explain the following
(i) People taking a lot of salt in their diet suffer from edema.
(ii) Equimolar solutions of glucose and KCl are not isotonic.  2 Marks
 
Q 19)Atomic mass of an element is 100. It has bcc structure. Its density is 5.96 g cm-3. Calculate the volume of the unit cell.  3 Marks
 
Q 20)(a) Write one use of polyacrylonitrile.       
(b) Name the monomer unit of neoprene.
(c) What is the role of sulphur in vulcanization of rubber?  3 Marks
 
Q 21)(a) Write IUPAC name of[Cr(NH3)4(H2O)3]Cl3
(b) Find the oxidation state of central metal atom in the following
[Co(NH3)5ONO]Cl2
(c) Predict the geometry and magnetic behavior of [Ni(CO)4]  3 Marks
 
Q 22)Give reasons for the following ?
(a)(i) The air becomes dry when passed over silica gel.
(ii) Colloidal medicines are more effective in treatment of diseases.
(b)(i) Which of the following will be most effective in coagulating Fe(OH)3 sol?
NaCl, MgCl2 , Na3(PO4), K4[Fe(CN)6]
(ii) Give one example each of O/W and W/O type of emulsions.  3 Marks
 
Q 23)Account for the following
(a) Fluorine does not exhibit positive oxidation state like other group members.
(b) Noble gases have low boiling points. 
(c) Ammonia behaves as Lewis base.  3 Marks
 
Q 24)(a)What are the factors which effect the rate of reaction?
(b) 30% of a first order reaction was completed in 90 minutes. Calculate the time taken for the reaction to go to 80% completion?  3 Marks
 
Q 25)(a)Complete and name the following reaction-
CH3CH2Cl +NaI
(b)Arrange the following in increasing order of reactivity towards SN2 reaction
CH3Br,CH3Cl,(CH3)2CHCl,CH3CH2Cl
(c)What are enantiomers?
  3 Marks
 
Q 26)Complete the following reactions
(a) NH4Cl(aq) + NaNO2(aq) ?
(b) PbS(s) + O3(g) ?
(c) 2XeF2 + 2H2O ?  3 Marks
 
OR

X2 is a greenish yellow gas with an offensive smell and is used in water purifications. It partially dissolves in water to give a solution which turns blue litmus red. When X2 is passed through NaBr solution, Br2 is obtained. Identify X2, name the group to which it belongs, write general electronic configuration of the group. Name the main products obtained when X2 reacts with dry slaked lime? Write equations also.  3 Marks
 
Q 27)(a) Name one narcotic analgesic.
(b) Detergents are called soap less soap. Why?
(c) Aspartame is used as artificial sweetener only in cold food and soft drinks and not in food stuff which is prepared by cooking (heating).Why?  3 Marks
 
Q 28)(a)The value of ?º for HCl, KCl and CH3COOK are 425.1, 121.3 and 94.0 ohm-1 cm2 mol-1 respectively. Calculate ?º acetic acid.
(b)How many coulombs are required for the reduction of 1 mol of Cu2+ to Cu?
(c)Electrolysis of KBr (aq) gives Br2 at anode but KF (aq) does not gives F2 at anode. Why?  5 Marks
 
OR

(a) The resistance of 0.02 M KCl solution in a conductivity cell was found to be 1100 ohms. The conductivity of this solution is 4.5 x10-3 Scm-1 . Calculate the cell constant.
(b) What are the units of molar conductivity?
(c) Write Nernst equation for the following cell
Mg(s)/ Mg2+ (0.01M) ? Cu2+ (0.0001M)  / Cu (s)
  5 Marks
 
 
Q 29)(a) Give reasons for the following
(i) Zn, Cd and Hg are not considered as transition metals.
(ii) Transition elements show variable oxidation states.
(iii) It is difficult to separate the lanthanoids elements in pure state.
(iv) Zn2+ compounds are colourless while Ni2+ salts are blue.
(v) Mercury is liquid while Cr is solid at room temperature.  5 Marks
 
OR

(a) Indicate the steps and chemical reactions involved in preparation of K2Cr2O7 from chromite ore.
(b) (i)Complete the following reaction
2KMnO4  + 5H2C2O4 + 3H2SO4 ?
(ii) Which is more stable and why? Cu+ or Cu2+.  5 Marks
 
Q 30)(i) Distinguish between the following pairs
(a) Acetophenone and benzophenone
(b) Acetaldehyde and acetic acid
(ii) Why HCOOH do not give HVZ reaction but CH3COOH does?
(iii) An organic compound (A) forms white precipitate with NaHSO3, gives negative Fehling's test and negative iodoform test. It is reduced to n-pentane on treatment with Zn-Hg/HCl. Identify the compound (A) and write its IUPAC name.  5 Marks
 
OR

(i)An organic compound (A) reacts with acetic acid in presence of sulphuric acid to form a sweet smelling compound (B).On hydrolysis (B) gives (A) and acetic acid. On reduction (A) forms (C). (C) is a pungent smelling liquid which is used as preservative for biological specimens and in manufacture of Bakelite. Identify compound (A), (B) and (C).
(ii)Represent the following chemical changes by balanced chemical reactions?
(a)Benzoyl anhydride is hydrolysed.
(b)Propanoic acid is heated with phosphorus pentachloride.   5 Marks
SET-2
 
Time Allotted: 03:00:00 Maximum Marks: 70
 
1.All questions are compulsory.
 
2.Marks for each question are indicated against it.
3.Question numbers 1 to 8 are very short-answer questions each of 1 mark. Answer them in about one sentence each.
4.Question numbers 9 to 18 are short-answer questions of 2 marks each. Answer them in not more than 30 words each.
5.Question numbers 19 to 27 are short-answer questions of 3 marks each. Answer them in not more than 40 words each.
6.Question numbers 28 and 30 are long-answer questions of 5 marks each. Answer them in not more than 70 words each.
7.Use Log Tables, If necessary.
8. Please give the explanation for the answer where applicable.
9. To view the answer, click on the Answer link alongside the Question.
 
Q 1)What is the difference between sol and gel?  1 Marks
 
Q 2)Write the formula of ionization isomer of [Co(NH3)5SO4]Br.  1 Marks
 
Q 3)The boiling point of alcohols is more than corresponding isomeric
ethers. Why?  1 Marks
 
Q 4)Write the monomer of PAN.  1 Marks
 
Q 5)Give IUPAC name of the following organic compound
CH3CH=CHCH2COCl  1 Marks
 
Q 6)Name the vitamin which helps in clotting of blood.  1 Marks
 
Q 7)Why aniline is more reactive than benzene?  1 Marks
 
Q 8)What are main constituents of dettol?  1 Marks
 
Q 9)(i) Name a solid which shows both Frenkel and Schottky defect.
(ii) Why Frenkel defect is not found in pure alkali metal halides?
(iii) Name point defect a crystal which lowers the density of crystal.                                                                                       
(iv) Name the nonstoichiometric point defect responsible for colour in   alkali metal halides.  2 Marks
 
Q 10) is square planar but    is tetrahedral in shape. Explain.  2 Marks
 
Q 11)State Henry's law. Give its two applications also.  2 Marks
 
Q 12)What is a secondary cell? Write the reaction/s taking place when a lead storage battery is in use.  2 Marks
 
Q 13)An element crystallizes into fcc unit cell type of a structure. The edge length of unit cell is 150 pm.If 150 g of this element have 12 x 1023 atoms, then calculate the density of the element.  2 Marks
 
OR

In an fcc arrangement of P and Q atoms, P atoms are at the corners of the unit cell. What is the formula of the compound?  2 Marks
 
Q 14)Write balance chemical reactions for the following changes:-
(i) Potassium permagnate reacts with potassium iodide.
(ii) Acidic potassium dichromate reacts with hydrogen sulphide.
  2 Marks
 
Q 15)Convert the following:-
(i) 1-bromopropane to 2-bromopropane.
(ii) Propene to 1-nitropropane.  2 Marks
 
Q 16)(i) What is the role of sulphur in vulcanization of rubber?
(ii) What is PHBV?  2 Marks
 
Q 17)Explain the following
(i) Swarts reaction
(ii) Why chloroform is kept in dark coloured bottles?  2 Marks
 
Q 18)(i) Aspirin is an analgesic drug. Why it is useful for heart patients?
(ii)What are antifertility drugs? Explain and give one example also.
  2 Marks
 
Q 19)(i) What would be the value of vant' Hoff factor for dilute solution of K2SO4?
(ii) Which will have higher boiling point?0.1 molar solution of glucose or 0.1 molar solution of NaCl in water?
(iii) Which of the following is not a colligative property?Osmotic pressure or freezing point?  3 Marks
 
Q 20)(a) Zn(s) +2Ag+?Zn2+(aq) +2Ag(s)
(i) Represent a galvanic cell in which the above chemical reaction takes place.
(ii) Write reactions taking place at electrode and cell reaction.
(b) Sn(s)/ Sn2+ (0.04) ? H+ (0.02)  / H2/Pt(s)
(Given Sn(s)/ Sn2+= -0.16V)
Write Nernst equation for above cell.
  3 Marks
 
Q 21)(a)(i) What happens when little amount of AgNO3 is added to KI solution?
(ii) Which of the following electrolyte will be most effective in the coagulation of Sb2S3 sol and why: AlCl3 or BaCl2 or KCl?
(b) Why is alum added for purification of water?  3 Marks
 
Q 22) Explain the following:-
(a) Role of  cresols in froth flotation method.
(b) Significance of leaching in extraction of silver.
(c) Basic difference between roasting and calcination.  3 Marks
 
Q 23)Give reasons for the following
(a) Transition metals form alloys easily.
 
(b) Zr and Hf have almost similar size.
 
(c) Cu, Ag & Au are considered as transition metal though they have d10 configuration.
  3 Marks
 
Q 24)(a) Arrange: CH3OH, (CH3)2CHOH, (CH3)3C-OH in decreasing order of
(i) Acidic strength.
(ii) Ease of dehydration.
(b) Distinguish between ethanol and phenol by one chemical test.
  3 Marks
 
Q 25)(a) What are interhalogen compounds? Write their general formula/s? Give examples.
(b)Arrange the followings as directed:
(i) HClO, HClO2, HClO3, HClO4 (Increasing Acidic Strength)
  3 Marks
 
Q 26)(a) Explain the following:-
(i) Use of carbylamine reaction
(ii) Methyl amine is a stronger base than ammonia.
(b) Write IUPAC name of the following compound
(CH3)2-N-CH2-CH3  3 Marks
 
Q 27)(a) Write structural differences between:-
(i) Cellulose and Amylose.
(ii) Sucrose and maltose.
(b) Give an example of anomers.  3 Marks
 
OR

(a) State differences between--
(i) ?-Helix and ?-pleated sheet structure
(ii) Primary and secondary structures of protein
(b) What is denatured protein?
  3 Marks
 
Q 28)(i) State any one condition under which a bimolecular reaction is kinetically a first order reaction.
(ii) Which will react faster with steam-----1cm x 1cm x 1cm cube of 10 g Magnesium or 10 g powdered magnesium?
(iii) The specific rate of reaction is 3.2x10-3 s-1.What is the order of reaction?
(iv) Why does rate of reaction not remain constant throughout?
(v) How is half life of a first order reaction related to initial concentration of reactants?
  5 Marks
 
Q 29) Assign reasons for the following:
(i) Acidic strength of acids is HF<HCl<HBr<HI.
(ii) Oxygen forms ? bonds whereas sulphur does not form ? bonds.
(iii) Nitrogen does not form NCl5 but P forms PCl5.
(iv) H3PO4 behaves as a dibasic acid.
(v) Of the noble gases only Xe forms chemical compounds.
  5 Marks
 
Q 30) An organic compound (A) molecular formula C5H10O gave positive 2, 4-DNP test but negative Tollen's and iodoform test. On reduction it gives n-pentane. Identify compound (A) and write its IUPAC name. Also write balance chemical reaction for reaction of (A) with NaBH4.  5 Marks
 
OR

Complete the following reactions and write the name of main products.
(i) 2HCHO + NaOH ?
(ii) CH3COCH3 + I2 + NaOH ?
(iii) CH3CHO + CH3MgBr  ?
(iv) CH3CH2CONH2 + Br2 + KOH  ?
(v) 6HCHO + 4NH3
  5 Marks
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Comments (6)
Tarin Bansal
Blazing goIITian

Joined: 27 Jul 2007 21:32:33 IST
Posts: 3134
9 Jan 2008 00:03:31 IST
0 people liked this

Sorry for those question marks. That's not my fault. Its some bug in GOIIT.
But the question papers are still easily readable.

VARSHA KRISHNAN
Blazing goIITian

Joined: 5 Jun 2007 13:29:19 IST
Posts: 438
9 Jan 2008 08:09:04 IST
0 people liked this

good job... thanx a lot buddy...

Pratik Anand
Blazing goIITian

Joined: 11 Jun 2007 22:58:05 IST
Posts: 914
9 Jan 2008 08:44:17 IST
0 people liked this

needed it...chem on 11th....

Anupam Agarwal
Hot goIITian

Joined: 3 Jun 2007 08:59:04 IST
Posts: 158
9 Jan 2008 16:55:43 IST
0 people liked this

Great work! keep it up yaar.

Tarin Bansal
Blazing goIITian

Joined: 27 Jul 2007 21:32:33 IST
Posts: 3134
9 Jan 2008 18:59:03 IST
0 people liked this

Thanx doston.
Keep giving ur comments I will keep giving U sample papers.

Madmax
Blazing goIITian

Joined: 24 Dec 2007 20:04:39 IST
Posts: 1111
17 Feb 2008 18:39:24 IST
0 people liked this

Bro give the link na yaar.........Copy karo par fir bhi source to bata do
http://www.extramarks.com


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