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THE BEST ACADEMY, UDYAVARA, p - Block elements (Group 15+16), 1. Strongest reducing agent is, 1) H20 2) H2S 3) H2Se 4) HeTe, 2. Xis used as a germicide, disinfectant and for sterilizing water. X also acts as an oxidizing, agent in the manufacture of KMn0Ox, X is, , 1) 02 2) 03 3) Ch 4) ClO,, 3. Bleaching action of S02 is due to its, , 1) Oxidising property 2) Acidic property, , 3) Reducing property 4) Basic property, , 4. SO2 reacts with Cl in sunlight to form, 1) Sulphuryl chloride 2) Sulphany! chloride 3) Sulphur dioxide 4) None of these, §. Which of the following is least acidic but possesses highest thermal stability?, , 1) H20 2) HeS 3) HeSe 4) HzTe, 6. Amongst element group 15 the property which increases down the group is, 1) Stability of -3 oxidation state 2) Reducing character of hydrides, 3) Electronegativity 4) Acidic nature of oxides, 7. In which of the following arrangement, the sequence is not strictly according to the property, against it?, 1) COz < SiOz <SnO, < PbO, : Increasing oxidising power, 2) HF < HCI < HBr < HI : increasing acid strength, 3) NH3 < PH; < AsH3 < SbH3 __: increasing basic strength, 4) B< C<O<N : increasing first ionization enthalpy, , 8, Extra pure N2 can be obtained by heating, , 1) NH; and CuO 2) NHaNOs 3) (NHa)2Cr207 4) Ba(Ns)2, 9, Which one of the following combines with Fe (11) ions to form a brown complex?, 1) NO 2) N20 3) N203 4) N205, , 10, An example of tetrabasic acid is, 1) orthophasphorous acid 2) orthophosphoric acid, 3) Metaphosphoric acid 4) pyrophosphoric acid