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Ni + H2SO4 (hot and concentrated) X(g).The liberated gas ______________________.

 
develops blue spots on the filter paper moistened with potassium iodate and starch solution
turns acidified K2Cr2O7 solution green
produces black precipitates with lead acetate solution
reacts with Cl2 water to produce an acid that produces white fumes with ammonia

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Why option 3 is wrong