Inorganic Chemistry Answers

Which of the following statements is FALSE?


A. Oxidation and reduction half-reactions occur at electrodes in electrochemical cells.

B. All electrochemical reactions involve the transfer of electrons.

C. Reduction occurs at the cathode.

D. All voltaic (galvanic) cells involve the use of electricity to initiate nonspontaneous chemical reactions.


Question 8

As the cell given below operates, the strip of silver gains mass (only silver) and the concentration of silver ions in the solution around the silver strip decreases, while the strip of lead loses mass and the concentration of lead increases in the solution around the lead strip. Which of the following represents the reaction that occurs at the negative electrode in the above cell?


Pb / Pb (NO3)2 (1.0 M) || AgNO3 (1.0 M) / Ag


A. Pb2+ + 2 e- Pb

B. Pb Pb2+ + 2 e-

C. Ag+ + e- Ag

D. Ag Ag+ + e

In voltaic cells, such as those diagrammed in your text, the salt bridge _______.


A. is not necessary in order for the cell to work

B. acts as a mechanism to allow mechanical mixing of the solutions

C. allows charge balance to be maintained in the cell

D. is tightly plugged with firm agar gel through which ions cannot pass


Question 2


Which of the following is the strongest oxidizing agent?


A. Pb2+

B. I2

C. Ag+

D. Pb

In the standard notation for a voltaic cell, the double vertical line "||" represents:

A. a phase boundary

B. gas electrode

C. a wire (metal) connection

D. a salt bridge


Question 2


Which of the following statements is (are) true for all voltaic (or galvanic) cells?

(I) Reduction occurs at the cathode.

(II) The anode gains mass during discharge (note: this means operation of the cell.)

(III) The voltage is less than or equal to zero.


A. only III

B. only II

C. only I

D. II and III

What mass of zinc is required to galvanize the top of a 3.00 m × 5.50 m sheet of iron to a thickness of 0.100 mm of zinc? If the zinc comes from a solution of Zn (NO3)2 and the current is 25.5 A, how long will it take to galvanize the top of the iron? The density of zinc is 7.140 g/cm3.

A. 231 g

B. 240 g

C. 115 g

D. 225 g

Which of the following statements are wrong?

Orbital angular momentum of 1s,2s and 3s electrons are same

Mn+7 is diamagnetic

Spin magnetic moment of Fe(0) is 6.92 B.M.

Percentage uncertainty in velocity of an electron in motion is equal to percentage uncertainty in its wavelength

(2.500*10^-1) mol/L NaOH solution was used to neutralize (1.30*10^1) mL hydrochloric acid. What is the concentration of the hydrochloric acid

A 6.20mL sample of 0.10mol/hydrochloride acid is used to standardized sodium hydroxide. What the concentration of the sodium hydroxide?

How many grams of ammonium chloride must be added to 0.050 kg of water to produce a

solution that freezes at -5.00 °C? The cryoscopic constant of water is 1.86 °C kg mol-1

. The

molar mass of ammonium chloride is 53.5 g mol-1

Calcium hydroxide and calcium sulfate are both used to prepare a saturated solution, S. Both

solids are only sparingly soluble, and the pH of S is found to be 11.6.

(i) Given that the Ksp for calcium hydroxide is 4.0 x 10-5

and the Ksp for calcium sulfate is 2.5 x 10-5 determine the concentration of sulfate ions present in S

Given that the Ka of benzoic acid is 6.3 x10-5, calculate the pH when 0.080M sodium hydroxide is added to 10.0 ml of 0.052M benzoic acid at the equivalence point