1. As pure elements, all of the hal are diatomic molecular species. Their meltin
ID: 874562 • Letter: 1
Question
1. As pure elements, all of the hal are diatomic molecular species. Their melting points are: Fa, 85 K, Cl2, 239 K, Bra, 332 K, and l,, 457 K. Using the Periodic Table, predict as best you can the molecular formula of elemental astatine, At, the only radioactive element in this family. Also predict whether it will be a solid, liquid, or gas at room temperature. Elemental formula Phase at room temperature 2. Substances A, B, and c can all act as oxidizing agents. In solution, A is green, B is yellow, and C is red. In the reactions in which they participate, they are reduced to A-, B-, and C-ions, all of which are colorless. When a solution of C is mixed with one containing B- ions, the color changes from red to yellow. Which species is oxidized? which is reduced? When a solution of C is mixed with one containing A ions, the color remains red Is C a better oxidizing agent than A? Is C a better oxidizing agent than B? Arrange A, B, and C in order of increasing strength as an oxidizing agent. 3. You are given an unknown, colorless, solution that contains one of the following salts: NaA, NaB, Nac. In solution, each salt dissociates completely into the Na on and the anion A-, B-, or C-, whose properties are given in Problem 2. The Na ion is effectively inert. Given the availability of solutions of A, B, and C, develop a simple procedure for identifying the salt that is present in your unknown.Explanation / Answer
Q. 1 : Elemental formula for Astatine : At
Phase at room temperature : Solid
Q.2 : Oxidation is removal of elctrons : B- is oxidized becuase It gives electrons
C is oxidized reduced : (oxidizing agent always reduces itselp and help other to oxidize. )
: C is better oxidizing agent than B
C > B > A
Q. 4 :
The salt will be NaA since A is weak oxidizing agent and so it will form bond with NaA
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