Hydrated transition metal ions typically produce solutions that are _____ (a) ac
ID: 513876 • Letter: H
Question
Hydrated transition metal ions typically produce solutions that are _____ (a) acidic. (b) basic. (c) neutral (d) strongly basic. (e) strongly acidic. Glancing at a periodic table, where do you expect to find elements that are good oxidizing agents? (a) at the bottom left (b) in the top left (c) in the transition metals (d) at the bottom (e) on the right (except for the last group) In the smelting of iron from iron oxide according to the equation Fe_2 O_3 (s) + 3 CO (g) rightarrow 2 Fe (s) + 3 CO_2 (g), what is the change in oxidation number for iron? (a) +3 (b) +2 (c) 0 (d) -2 (e) -3 The following reaction occurs in basic solution. Identify the oxidizing agent. (a) H_2 O (l) (b) NO_3^- (aq) (c) OH^- (aq) (d) Zn (s) (e) NH_3 (aq)Explanation / Answer
(28) (a) acidic
(29) (e) On the right side except last group.
Oxidising agent is the one which undergoes reduction. As we move from left to right the atomic size will decrease consequently the nuclear charge will increase. And also the 16 th and 17 th group elemtns are short of only two and one electron to get stable noble gas configuration. Hence they are ready to undergo reduction and acts as strong oxidising agents.
Among the elements of periodic table F is the strongest oxidising agent.
(30) (e) - 3
Initial oxidation number in Fe2O3 is +3 and final oxidation number in Fe is 0. Hence change is 0-3 = -3.
(31) Oxidising agent is the one which undergoes reduction.
Oxidation number of N in NO3- is +5 but in NH3 is -3. So, its oxidation number is decreased which indicates gaining of electrons. So, it undergoes reduction.
(b) NO3- is the oxidising agent
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