BSEB / Bihar Board 12th Exam Sample Paper Chemistry


Sample papers


  Bihar School Examination Board (BSEB)

SAMPLE PAPER / MODEL TEST PAPER

SUBJECT – CHEMISTRY

BSEB SENIOR SECONDARY EXAM 2011




Section 1 (Objective Type )

  1. In the following Question Nos. 1 to 10 there is only one correct answer among the four alternatives. You have to choose that correct option and mark in the answer – sheet
  1. Faraday’s second law at electrolysis is related to

(a) atomic number of the cation                        (b) equivalent weight of the electrolyte

(c) atomic number of nation                            (d) speed of cation

2. Which of the following is not element of first transition series?

(a) Iron                (b) Chromium            (c) Magnesium         (d) Nickel

3. The formula of copper pyrite is

(a) CuFes                    (b) CuFeS2 (c) Cu2S                  (d) Cu2FeS2

4. Which of the following is not a colligative property?

(a) Depression in freezing point                  (b) Optical activity

(c) Optical activity                                      (d) Elevation of boiling point

5. The number of chiral carbon is glucose is

(a) 4              (b) 5                        (c) 3                  (d) 1

6. The antiseptic action of CHI3 is

(a) due to iodoform

(b) due to liberation of free iodine

(c) partially due to iodine and partially due to CHI3

(d) Tetanus

7. Glycerol  is a

(a) Primary alcohol                             (b) Secondary alcohol

(c) Tertiary alcohol                              (d) Trihydric alcohol

8. The number of P – O – P bonds in cyclic metaphosphori acid is

(a) two                     (b) zero               (c) three              (d) four

9. Smelting involves reduction of metal oxide with

(a) Al               (b) C             (c) Mg                  (d) CO

10. Which of the following is not a condensation polymer?

(a) Glyptal                 (b) Nylon – 6,6          (c) PTFE          (d) Dacron

II. In Question Nos. 11 to 15 there are two statements (statement I & Statement II given. Choose the correct option for each question out of options A, B, C, and D o the basis of given statement.

11. Consider the following statement:

Statement I : Inert gases are chemistry inert

Statement II: Inert gases have high ionization energy and zero electron affinity of these statements:

(a)   Both the statements are true and Statement II is the correct explanation Statement I

(b)  Both the statement are true, but Statement II is not the correct explanation Statement I.

(c)   Statement I is true, but Statement II is false

(d)  Statement I is false, but Statement II is true

12. Consider the following statement:

Statement I: KMNO4 is due to charge transfer

Statement II: Colour of KMNO4 is due to charge transfer of these statements:

(a)   Both the statement are true and Statement II is the correct explanation of Statement I.

(b)  Both the statements are true, but Statement II is not the correct explanation of Statement I

(c)   Statement I is true, but Statement II is false.

(d)  Statement I is false, but Statement II is true

13. Consider the following statement

Statement I Decrease in free energy comes from spontaneous reaction.

Statement II: Spontaneous reactions are exothermic of these statements:

(a)   Both the statements are true and Statement II is the correct explanation Statement I.

(b)   Both the Statements are true, but Statement II is the correct explanation Statement I.

(c)    Statement I is true, but Statement II is false.

(d)  Statement I is false, but Statement II is true.

14. Consider the following statements:

Statement I: Benzoic acid is weaker acid than formic acid.

Statement II: Pheynl group when attached with carboxylic group, it acts as electron donor.

Of these statements:

(a)   Both the statement are true and Statement II is the correct explanation of Statements I.

(b)  Both the statement is true, but Statement II is not the correct explanation of Statements.

(c)   Statement I is true, but statement II is false.

(d)   Statement I is false, but Statement II is true.

15. Consider the following statements:

Statement I: All ores are mineral

Statement II: All minerals are ore.

Of these statements:

(a)   Both the statements are true and Statement II is the correct explanation of Statements I.

(b)  Both the statements are true, but Statement II is not the correct explanation of Statements I.

(c)   Statement I is true, but Statement II is false.

(d)  Statement I is false, but Statement II is true.

III. In questions nos. 16 to 18 there is only one correct answer among the four four alternatives. You have to choose the correct answer and mark it in the answer sheet.

16. Chloramphenicol is

(a) antibiotic                     (b) analgesic            (c) antipyretic       (d) none of these

17. Which of the following is carbohydrate?

(a) Thiamine          (b) Lactose                        (c) Glycerol        (d) Insulin

18. The oxygen atom in ether is

(a) very reactive               (b) replaceable                       (c) comparatively                      (d) active

IV. In Question Nos. 19 to 22, there are two columns. In column I Column I four questions are given. You have to match the correct answer from the options in Column

II:

Column I                                                                  Column II

19. Semipermeable membrane                                   (a) C6H5NC

20. Freon                                                                    (b) AgNO3

21. Carbylamine                                                        (c) Cu2 [Fe (CN)6]

22. Lunar caustic                                                        (d) CF2 Cl2

V. For Question Nos. 23 to 25, a passage is given. Read carefully the passage and select the correct answer from the given four options of the questions.

Nucleic acid is the prosthetic group of nucleoproteins. Theses are natural bio polymers made of nucleotide units i. e., poly nucleotides. They are present in all living cells and direct protein synthesis. They are responsible for transfer of genetic information. Nucleic acids are of two types DNA and RNA. Nucleic acids are basically made up of three units namely nitrogenous bases, sugar and phosphates.

23. In DNA, thymein is held by two hydrogen bonds with the base

(a) Adenine                    (b) Cytosine              (c) Thymine         (d) Guanine

24. Adenosine is an example of

(a) Nucleotide            (b) Pyrimidine base           (c) Nucleoside          (d) Purimen base

25. Which of the following is not a pyrimidine base?

(a) Uracil               (b) Cytosine                 (c) Thymine            (d) Guanine

Short answer type questions

  1. How will you distinguish between Lyophobic colloid and Lyophilic colloid?
  2. Give an example of each of the following:

(a) Gel                                                           (b) Aerosol

3. Calculate the osmotic pressure of 5% solution of urea at 273 K.

Or, What is reverse osmosis

4. How will you convert –

(a) aniline to bromobenzene                               (b) ethanol to methanamine?

5. Give reason for the following:

(a) Formic acid is stronger than acetic acid.

(b) aniline is less basis than methylamine.

6. Account for the followiig:

(a) The boiling point of ether is much lower than that of alcohol.

(b) Phenol is more acidic than alcohol.

7. Write down the half cell reaction and cell reaction for the Daniel cell.

Zn (s) | Zn +2 (aq.) (1M) || Cu +2 (aq.) (1M) | Cu (s)

8. Account for the following:

(a) HI is strong acid than HF

(b) The electron affinity of fluorine is less than that of chlorine

9. Give definitions of the following with examples:

(a) Calcination                          (b) Roasting

10. Differentiate between absorption and adsorption.

11. Give the chemical test to distinguish methyl acetate and ethyl acetate

LONG ANSWER TYPE QUESTIONS

12. (a) A first order reaction is 75% completed in 60 min. Find the half – life period of the reaction.

(b) Give one example of zero order and first order reactions.

Or,

Describe the general characteristics of transition elements with special reference to the following:

(a) Formation of colour salt                  (ii) Variable oxidation state.

13. An element A (Atomic mass = 100) having bcc structure has unit cell edge length of 400 pm. Calculate the density of A and number of unit cells in 10 gm of A.

14. Write the following giving chemical educations:

(i) Carbylamine reaction                       (ii) Wurtz reaction

(iii) Nitration of benzene

15. (a) What is reverse osmosis?

(b) What do you mean by crystalline solid and amorphous solid”?





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