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FBISE Chemistry XII (2018-First Group) 1. Br - reduces H 2 SO 4 to form a) S b) H 2 S c) SO 2 d) SO 3 ... Answer is c) Explanation:Br - is strong reducing agent and reduces H 2 SO 4 to form SO 2 . In this reaction oxidation state of S decreases from +6 (in H 2 SO 4 ) to +4 (in SO 2 ). show Answer 2. Which of the following will not produce nitrite on heating? a) LiNO 3 b) NaNO 3 c) KNO 3 d) RbNO 3 ... Answer is a) Explanation: LiNO 3 will not produce nitrite on heating like other alkali metals becuse lithium nitrite is unstable due to high polarizing power of Li + ion and it docomposes to most stable lithium oxide. show Answer 3. In reaction with aqueous copper complex, [Cu(H 2 O) 6 ] +2 , NH 3 acts as ligand well as a) An acid b) A base c) A salt d) A nucleophile ... Answer is b) Explanation: Ammonia acts as base and produces [Cu(H 2 O) 4 (OH) 2 ] when used...