CBSE 11th Board Sample Paper Chemistry


 

                                                                   

Central Board of Secondary Education (CBSE)                                                       

Guess Paper – 2011

Class – XI

Subject – Chemistry

 


 

1.      What is photovoltaic cell?

2.       Why HF acid is stored in wax coated glass bottles?

3.       What is the molarity of 1 N KMnO4?

4.       Give the IUPAC name of

                                 NO2 

                                                     OC2H5                                                                             

 5.       Why are Grignard reagents soluble in ether but not in benzene?

6.       Give the IUPAC name of

                   H3C                  CH3

                                  =                  H

                      H                   C                       

                             H3C                  Br

 7.       Why is bakelite a thermoplastic polymer?

8.       What is invert sugar?

9.       Equilibrium constant is related to E0cell but not to Ecell, explain why?

                                                                                        OR

      Calculate the emf of the cell in which the following reaction takes place:

  •                  Ni (s) + 2Ag+ (0.002 M) ®Ni+2 (0.160 M) +2Ag

 

       Given that E0cell = 1.05 V.

10.   Under what condition Van’t hoff factor is,

(i)                 equal to 1

(ii)               greater than 1

(iii)             less than 1.

11.   What is mercury cell? Give its electrode reaction.

12.   What inspired N. Bartlett for carrying out reaction between Xe and PtF6 ?

13.   Why the ester hydrolysis is slow in the beginning and becomes faster after some time?

14.   Arrange each set of compounds in order of increasing boling points.

 Bromoethane, bromoform, chloromethane, dibromomethane.

15.   Although electron gain enthalpy of fluorine is less negative as compared to chlorine, fluorine is a stronger oxidizing agent than chlorine. Why?

16.   Desribe the features of catalysis by zeolites.

17.   Give the chemical test to distinguish between the following pair of compounds:

(i)                 Ethylamine and Aniline

(ii)               Aniline and benzylamine

18.   How does the presence of double bonds in rubber molecules influence their

structure and reactivity?

19.   Niobium crystallizes in bcc structure. If density is 8.55 g cm-3, calculate atomic

radius of niobium,

given that its atomic mass is 93 u.

20.   Two elements A & B form compounds having molecular formula AB2 and AB­4.

When dissolved in 20 gm of benzene, 1 gm of AB2 lowers the freezing point

by 2.3 K whereas 1.0 gm of ABlowers it by 1.3 K. The molal depression constant for benzene is 5.1 K kg mol-1. Calculate atomic masses of A and B.

 

21.   Describe the principle of froth floatation process. What is the role of stabilizer and of a depressant? Give one example each.

OR

      What is the chief ore of iron? Write chemical reactions taking place in the extraction of iron

       from its ore by blast furnace.

22.   Derive integrated rate equation for rate constant for a first order reaction.

What would be units of the first order rate constant, if the concentration is expressed

in moles per litre and time in seconds?

23.   Compete the following reaction:

       (i)C6H5CHO + CH3CH2CHO        dil.NaOH ?

                                                              NaBH4

(ii) CH3COCH2COOC2H                

                                                                H+

                                                        (i) O3

 (iii)                                                                 2                =O

                                                       (ii) Zn-H2O

 

24.   Explain why

(i)  The dipole moment of chlorobenzene is lower than that of cyclohexyl

      chloride.

(ii) Sulphuric acid is not used during the reaction of alcohol with KI.

25.   What is meant by unidentate, didentate and ambidentate ligands?

Give two examples for each.

26.   What happens when D-glucose is treated with the following reagents?

    (i) HI     (ii) Br2 water     (iii) HNO3

      27. Explain the following terms with suitable examples.

                (i) Anionic detergents (ii) cationic detergents

(iii) neutral detergents.

      28. (a)  Explain:

                (i)   In transition metal halides, the highest oxidation state is generally

more stable with

                         fluorine.                                                                                                                                                                             

                (ii) In transition metal oxides, oxygen stabilizes the highest oxidation

state than flourine. 1

            (b) A blackish brown colored solid ‘A’ when fused with alkali metal

hydroxides in presence

                  of air, produces a dark green colored compound ‘B’, which on

electrolytic oxidation in

                  alkaline medium gives a dark purple colored compound ‘C’. Identify

A, B and C and

                  write the reaction involved.                                                                                                                                             

OR

(a)    Describe the preparation of K2Cr2O7 from chromite ore. Write the chemical equations      

      of the reaction involved. What is the effect of pH of a solution of K2Cr2O7?                      

(b)   Represent the reaction of acidified K2Cr2Owith (i) KI and (ii) FeSO4 with the help of

      chemical reaction.                                                                                                                                                    

(c)  Draw the structure of chromate ion.                                                                                                                            

      29.  (a) How is the presence of SO2 detected?                                                                                                                  

 (b) Why Kais less than Ka1 for H2SO4 in water?                                                                                      

 (c)  Draw the structure of sulphurus acid.                                                                                                                  

                                                                                                                    OR

(a)    A translucent white waxy solid (A) on heating in an inert atmosphere is

converted into its allotropic form (B). Allotrope (A) on reaction with very dilute

KOH liberates a highly poisonous gas (C) having rotten fish smell. With excess of

chlorine (C) forms (D) which hydrolyses to compound (E). Identify A toE. Write

all the possible reaction.                  5

30.     (a)  How will you convert the following into benzoic acid?

              (i) Benzonitile   (ii) toluene.                                                                                                                                         

       (b)  Write short notes on Etard reaction.                                                                                                                     

                                                                                                                OR

(a)     How will you convert ethanal into the following compounds?

(i) Butane-1, 3-diol     (ii) But-2-enal                                                                                                                     

             (b)  Write short note on Gattermann-Koch reaction.                                                                                                               

CBSE 11th Board Sample Paper Chemistry
Rate this post




More Govt Jobs given below

SSC Combined Graduate Level Exam Sample Paper

Staff Selection Commission

Combined Graduate Level Exam

Subject – General English

Directions (1-10): In the following passage there are blanks, each of which has been numbered. These numbers are printed below the passage and against each four words are suggested, one of which fits the blank appropriately. Find out the appropriate word.

A two party (1) is must for a democratic country like (2) to achieve national objectives (3) as removal (4) unemployment,

 » Read more about: SSC Combined Graduate Level Exam Sample Paper  »


SSC CGL Exam Model Practice Paper

MODEL PRACTICE SET

Subject- General English

Combined Graduate level Examination SSC 2011

Directions (1-10): A passage is given below in which blanks have been numbered. Four alternative choices are given below against each number. In the context of the whole passage, select the best word in each case to fit each of the blanks to complete the passage correctly and meaningfully.

During the World War I penicillin was (1) on six patients.

 » Read more about: SSC CGL Exam Model Practice Paper  »


IBPS Clerk Exam Model Question Paper 2

SAMPLE PAPER

BANK PROBATIONARY OFFICER (BANK PO)

 

GENERAL KNOWLEDGE

 

1. Which country will introduce entrepreneur visa to encourage foreign nationals from India and elsewhere to catalyze the country’s economic recovery?

(a) US                                                         (b) Britain

(c) France                                                (d) Denmark

(e) None of these

2. Name the state whose chief minister has said that the Armed Forces Special Powers Act can be withdrawn from some areas with a rider that the Army can step in again if the situation so warrants.

 » Read more about: IBPS Clerk Exam Model Question Paper 2  »


IBPS PO / Management Trainee Exam Model Question Paper 2

SAMPLE PAPER

Bank Probationary Officer ( Bank PO)

 

General Knowledge

1. Name the Karnataka minister who resigned in the wake of the Lokayukta police filing a first information report against him on irregularities related to allotment of land through the Karnataka Industrial Area Development Board (KIADB).

(a) Katta Subramanya Naidu              (b) N Santosh Hegde

(c) Jagmohan Reddy                           (d) Roshan Baig

(e) None of these

2.

 » Read more about: IBPS PO / Management Trainee Exam Model Question Paper 2  »


IBPS PO / Management Trainee Exam Model Question Paper 1

SAMPLE PAPER

NABARD Bank PO

 

General Knowledge

1. Which of the following is rated the poorest region of the world?

(a) The Middle East                           (b) Asia

(c) Sub-Saharan Africa                      (d) Latin America

(e) None of these

2. Which of the following terms is not used in the world of economics/finance?

(a) Sinking Fund                                 (b) Third World

(c) Open Door Policy                                     (d) Devaluation

(e) Privilege Motion

3.

 » Read more about: IBPS PO / Management Trainee Exam Model Question Paper 1  »


Disclaimer: we provide job information based on information from different job website.although we take extreme care for accuracy of the information provided, but you must check the authenticity of the website before applying for the job. We are not responsible for your operation , once you leave our website and apply thereafter. Please recheck the genuineness of the job website from your end. Exams|Exam Pattern | Contact us| Privacy Policy