1. 47. Hyperconjugation involves overlap of the following orbitals   σ – σ   σ – p   p – p   π – π   Hint Half-n-half Clue   2. 48. The major product of the following reaction is   Half-n-half Clue   3. 49. Aqueous solution of Na2S2O3 on reaction with Cl2 gives   Na2S4O6   NaHSO4   NaCl   NaOH   Half-n-half Clue   4. 50. Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of   nitrogen   oxygen   carbon dioxide   argon   Half-n-half Clue   5. 51. Under the same reaction conditions, initial concentration of 1.386 mol dm–3 of a substance becomes half in 40 seconds and 20 seconds through first order and zero order kinetics, respectively. Ratio ( k1 k0 ) of the rate constants for first order (k1) and zero order (k0) of the reactions is   1.5 mol dm–3   1.0 mol dm–3   2.0 mol–1 dm3   0.5 mol–1 dm3   Half-n-half Clue   6. 52. 2.5 mL of 2 5 M weak monoacidic base (Kb = 1 × 10–12 at 25ºC) is titrated with 2 15 M HCl in water at 25ºC. The concentration of H+ at equivalence point is (Kw = 1 × 10−14 at 25ºC)   3.7 × 10–13 M   3.2 × 10–7 M   3.2 × 10–2 M   2.7 × 10–2 M   Half-n-half Clue   7. 53. The correct statement(s) about the compound given below is (are)   The compound possesses centre of symmetry   The compound possesses plane of symmetry   The compound is optically active-;020;-The compound possesses axis of symmetry   Half-n-half Clue