3. What is the oxidation number of Se in K SeO? A) -6 B) +6 C)+I D)44 E) -2 4. W

Question

3. What is the oxidation number of Se in K SeO? A) -6 B) +6 C)+I D)44 E) -2 4. Which of the following solutions is a good buffer system? A) a solution that is 0.10 M HCH,0, and 0.10 M LIC H,0 B) a solution that is O.10 M HBr and 0.10 M LiC H,O C) a solution that is 0.10 M HI and 0.10 M NH D) a solution that is 0.10 M LIOH and 0.10 M KOH E) None of the above are buffer systems 5. Which of the following is the correct cell notation for the reaction? 6. Examine the following half-reactions and select the strongest oxidizing agent among the -0.755 V 7, A solution is 2.00x 10 M in NaCl and 1.30x 10' M in AgNO, Will a procipitate form? K for AgC-L 10 A) Yes B) No 8. Which of the following is an exact or approximate value of the pll at the equivalence point of a titration of a weak acid with a strong base? A) 3.5 B) 70 10 D) 140 E) 10

Explanation / Answer

Solved the first three problem post multiple question to get the remaining answers

Q3)

Let the oxidation number of Se be x

Potassium (K) will always exists in +1 oxidation and Oxygen(O) will exists in -2 oxidation

2(1) + x + 4(-2) = 0

x = 6

Hence the oxidation state of Se is +6

Correct answer is Option B

Q4)

A buffer is formed when one is acidic/basic and other is salt in nature with the one ion in common

The option A satisfies that condition since C2H3O2- is a common ion, whereas HC2H3O2 is an acid and LiC2H3O2 is a salt

Q5)

Al is oxidized from ground state to +3 oxidation state

Au is reduced from +3 state to the ground state

cell notation is oxidizing half followed by reduction half, hence final answer will be

Al(s)|Al(+3)||Au(+3)|Au(s)

Hence correct answer is Option B

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