EKLAVYA EDUCATION

             TEST      CLASS - XII CHEMISTRY (Surface chemistry)                                                                                       MM-35                                                                                       TIME-60 MIN       Q1 what is observed when light is passed through a colloidal solution?            [1]       Q2.State Hardy- Schulze rule. ?                                                                                    [1]      Q3. What is a protective colloid?                                                                                   [1]                                       Q4.   What is flocculation?                                                                                               [1]         Q5.   Alum is used for purification of water. Why?                                                      [1]       Q6.   Define the term peptization?                                         

ENGEENERING ENTRANCE AND MEDICAL ENTRANE EXAM-2013/2014                                       SUBJECT--CHEMISTRY    Q1-Which of the following will not give co 2 gas with NaHSO 3. ?  A)       Phenol                                         B) Succinic acid C) Benzoic acid                           D) Acetic acid Q2- Bezaldehyde reacts with acetic anhydride, gives- A)     Benzoic acid                          B) Cinnamic acid C) Succinic acid                         D) Acetophenone Q3-Cacl 2 undergoes 20% dissociation. What is it vant Hoff factor-   A) 1.6                                             B) 1.4   C)   2.4                                              D) 2.8 Q4-Which of the following compound have 1.732 magnetic moment-         A)   [Cucl 6 ] 4-                                B) [Crcl 6 ] 4-         C) [Co (OH] 4-                                      D) [ Zncl 6 ] 4-   Q5-100ml of 0.2M CH 3 COOH mixed with 200 ml of o.1M CH 3 COONa. If PKa is 4

  CORDINATION CHEMISTRY; SOME IMPORTANT QUESTION      XII-BOARD 2013                                                                                        MM=35                                                                              TIME =60 MIN   Question = 1 -6 (1-marks),,7-17(2-marks),,18-20 (3-marks) Q1 . Write the formula for the following coordination compound: Tetraamineaquachloridocobalt (III) chloride Q2 . Why is geometrical isomerism not possible in tetrahedral complexes having two different types of unidentate ligands coordinated with the central metal ion? Q3 . Write the IUPAC name of the following coordination compound: [CoCl 2 (en) 2 ]Cl. Q4. The spin only magnetic moment of [MnBr 4 ] 2- is 5.9 BM. Predict the geometry of the Complex ion? Q5 . Out of the following two coordination entities which is chiral (optically active)? (a)   cis ‐[CrCl 2 (ox) 2 ] 3- (b) trans ‐[CrCl 2 (ox) 2 ] 3- Q6 . [NiCl 4 ] 2