57) The oxidation states of sulphur in Caro′s and Marshall′s acid are:

58) A compound of Xe and F is found to have 53.5% Xe. What is the oxidation number of Xe in this compound?

59) Number of moles of K₂Cr₂O₇ that can be reduced by 1 mole of Sn²⁺ ions is:

60) When methane is burnt in oxygen to produce CO₂ and H₂O, the oxidation number changes by:

61) The number of equidistant oppositely charged ions in NaCl crystal is: