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21. Which is not possible on the basis of molecular orbital theory?

a. H₂⁺              b. He₂             c. He₂⁺           d. C₂

                                                                                                                           

22. The indicator used in the titration of oxalic acid  and sodium hydroxide

a. Methyl Orange                                                b. Methyl red

c. Phenolpthalein                                               d. None of the three

 

23. Which statement about anhydrous Aluminium chloride is correct?

a. It exists as AlCl₃                                b. It is not easily hydrolysed

c. It is a strong Lewis base                   d. It sublimes at 100⁰ C under vacum

 

24. Which of the following alkali metal cation is the most heavily hydrated?

a. Li⁺                                                                        b. Na⁺

c. K⁺                                                                         d. Cs⁺

 

25. Pick the Diamagnetic species

a. O₂                                                                        b. O₂⁺

c. O₂^-                                                                       d. O₂^2-

 

26. Which of the following element can exhibit both positive as well as negative oxidation state?

a. Fr                                                                         b. Mg

c. I                                                                            d. Ne

 

27. The Inert pair effect is most predominant in

a. B                                                                          b. Ga

c. Al                                                                         d. Tl

 

28. Tin plague means

a.     Conversion of white tin to grey tin

b.     Conversion of grey tin to white tin

c.     Emission of sound while bending a tin plate

d.     Conversion of Stannous salts to Stannic salts

 

29. In CuSO₄.5H₂O, copper is coordinated to

a. 1 water molecule                                           b. 4 water molecules

c. 5 water molecules                                          d. 1 Sulphate anion

 

30. Sodium hydride is an example of

a. Ionic hydride                                                   b. Molecular hydride

           c. Metallic hydride                                              d. Polymeric hydride