Which of the following pairs would be appropriate to make

a buffer of pH 4.0?

Group of answer choices

a. H₂CO₃ and NaHCO₃

b. HNO₂ and HNO₃

c. HClO and NaClO

d. HCHO₂ and KCHO₂

e.HI and NaI

#2

Which of the following will form a buffer?

Group of answer choices

a. ClO₂^- with slowly added NaOH

b. KF with slowly added NaOH

c. HClO₄ with slowly added NaOH

d. KClO (aq) with slowly added HCl

e. HC₂H₃O₂ with slowly added HC

#3

Which of the following is an acidic salt?

Group of answer choices

a. KCl

b. NaNO₃

c. NH₄Br

d. NaC₂H₃O₂

e. HCl

#4

When the following redox reaction is correctly balanced:

BrO₃ ^-  +  Cr(OH)₃(s)  → Br^-  +  CrO₄ ^2-(basic)

what is the coefficient in front of OH^-

a. 12

b. 10

c. 1

d. 6

e. 4

#5

What is the pH of 0.15 M KClO (aq)?

a. 10.35

b. 9.83

c. 13.18

d. 3.65

e. 4.17

#6

What is [C₂O₄ ^2-] in a 0.1 M solution of H₂C₂O₄ dissolved in pure water?

a. 1.0 x 10^-14 M

b. 6.1 x 10^-5 M

c. 6.5 x 10^-2 M

d. 1.6 x 10^-10 M

e. 8.1 x 10^-2 M

#7

Which of the following ions is classified incorrectly?

a. K⁺    neutral cation

b. NH₄ ⁺    acidic cation

c. Sr²⁺    neutral cation

d. NO₂ ^-    neutral anion

e. C₂H₃O₂ ^-    basic anion

#8

When the following redox reaction is correctly balanced:

NO (g)  +  Pb²⁺ →  NO₃ ^-  +  Pb (s)    (acidic)

what what is the coefficient in front of NO(g) ?

a. 2

b. 6

c. 3

d. 8

e. 1

#9

When the following redox reaction is correctly balanced:

Cl₂  +  MnO₂ (s)  → ClO₃ ^-  +  Mn²⁺ (acidic)

what is the coefficient in front of H₂O ?

Group of answer choices

a. 5

b. 4

c. 10

d. 1

e. 8

#10

For the reaction in the previous problem, which substance is

the reducing agent?

Group of answer choices

a. ClO₃ ^-

b. H⁺

c. MnO₂ (s)

d. Cl₂

e. Mn²⁺