4 Square planar Diamagnetic 125 The hardest lanthanide is 1 La 2 Gd 3 Sm 4 Yb 126 Which of the following can not exist together in aqueous solution 1 HgCl and SnCl 2 HgCl and SnCl 3 SnCl4 and FeCl3 4 SnCl4 and PbCl 127 Which of the following is the correct order of increasing field strength of ligands to form coordination compounds 1 SCN F CN C 0 2 F SCN C 0 CN 3 CN C 0 SCN F 4 SCN F C 02 CN 128 Alum helps in purifying water by 1 forming Si complex with clay particles 2 sulphate part which combines with the dirt and removes it 3 aluminium which coagulates the mud particles 4 making mud water soluble 129 Among the following surfactant molecules the surfactant that forms micelles in aqueous solution at the lower CMC at ambient condition is 1 CH3 CH 15N CH3 3Br 2 CH CH OSO Nat 3 CH3 CH COO Na 4 CH3 CH2 11N CH3 3Br 130 Which one of the compound does not decolourised an acidified solution of KMnO4 1 S0 2 FeCl3 3 H 0 4 FeSO4 131 Which ore contains both iron and copper 1 Cuprite 2 Chalcocite 3 Chalcopyrite 4 Malachite 132 Which one of the following compounds on hydrolysis yield hydrogen peroxide 1 HNO3 2 H P 0 3 H S 08 4 H S 06 133 The formula of exhausted permutit is 1 K Al Si 0 XH O 2 CaAl2Si O8 xH O 3 Na Al Si 0 xH O 4 CaB Si 0g xH O 134 For a tetrahedral complex MCI the spin only magnetic moment is 3 83 B M The element M is 1 Co 2 Cu