CBSE 12th Board Sample Paper Chemistry


Sample papers


Central Board of Secondary Education (CBSE)

Sample Paper – 2011
Class – XII
Subject – Chemistry




 


Q.1      FILL THE BLANKS

1. XeF6+NaF  —–à

2. Zn+V.DIL HNO3  —-à

3.SCl2+NAF  —-à

4.POCl3+H2O —-à

P4O10

5.HNO3 —HEAT——–à

 

Q.2      GIVE  THE METHIOD OF PREP.OF XeOF4 & XeO3 FROM XeF6

Q.3      DRAW THE STRUCTURE OF 1)H2SO5     2)H2S2O8

3)HOClO3 4) BrF3     5)XeF6

Q.4  GIVE THE ANSWER OF FOLL:

1) NOBALGASELEMENT FROM COMPOUND WITH ONLY FLOURIN &  OXYGEN

2) WHY ALLBOND IN PCL5ARE NOT EQUAL IN LENGTH

3) OZONE IN THERMODYNAMICALLY UNSTABLE ?

4) HOW IS THE PRESENCE OF SO2 IS DETECTED ?

5) GIVE TWOIMP. USE OF NOBALGAS.

 

Q.5 GIVE THE ANSWER OF FOLL

1) DESCRIBE THE MANUFACTHRING OF H2SO4 BY CONTACT PROCESS?

2) WHY DOES R3P=0 EXIST BUT R3N=0 DOES NOT ?

3) HOW RED PHOSPHOROUS IS OBTAINED FROM WHITE PHOSPHORUS ?

4) SF4 CAN BE HYDROLYS BUT SF6 CAN NOT ?

5) O3 ACT AS POWER OXIDISING AGENT

6) GIVE REASON, WHICH PREMPTED BARTTLET TO PREPARE 1ST NOBALGAS COMPOUND.

 

Q.6 GIVE THE ANSWER OF FOLL

1) FLOURINE DOES NOT SHOWVARIABLE O.S WHILE OTHER MEMBER OF HALOGEN  FAMILY EXHIBIT VARIABLE O.S

2) HF IS STORED IN GLASS BOTTLE BUT IS KEPT IN WAX BOTTLE.

 

Q.7     EXPLAIN WITH REASON

 

1)      THE ENTHALPY OF ATOMISATION OF  T.MARE HIGH

2)CHEMISTRY OFALLTHE LANTHANOIDS IS QUITE SIMILAR

2)      CRO42-   IS STRONG OXIDIZING AGENT WHILE MNO<sub%





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