Chemistry quiz

The amount of electricity required to deposit 1 mol of aluminium from a solution of AlCl₃ will be

• 0.33F

• 3F

• 2F

• 1Ampere

Which of the following is supplied to the cathode of a fuel cell ?

• HYdrogen

• Nitrogen

• Oxygen

• Chlorine

Molar conductivity of 0.15M solution of KCl at 298K , if it's conductivity is 0.0152Scm^-1 will be

• 124 S cm² mol^-1

• 204 S cm² mol^-1

• 101 S cm² mol^-1

• 300 S cm² mol^-1

The standard reduction potential of X,Y and Z metals are 0.52, -3.03, -1.18 respectively. The order of reducing power of the corresponding metals is

• Y>Z>X

• X>Y>Z

• Z>Y>X

• Z>X>Y

Standard solution of KNO₃ is used to make a salt bridge because

• Velocity of K⁺ is greater than NO₃ ^-

• Velocity of NO^{₃ -} is greater than K⁺

• Velocity of both K⁺ and NO^-₃ are nearly same

• None of these

An electrochemical cell generally consists of cathode and anode. Which of the following statements is correct with respect to the cathode ?

• Oxidation occurs at the cathode.

• Electrons move in the cathode

• Usually denoted by negative sign

• Is usually made by insulating material.

What is the direction of flow of electrons in an electrolytic cells ?

• Anode to cathode externally

• Anode to cathode internally

• Cathode to anode externally

• Cathode to anode in the solution

What is the emf of a galvanic cell if E^°_cathode = 0.80 V and E^°_anode=-0.76 V

• 1.56 V

• -1.56 V

• 0.04 V

• -0.04 V

Find the number of electrons transferred in the equation Cu + 2Ag⁺ ----- Cu²⁺ + 2Ag

• 1

• 2

• 3

• 4

Which of the following is the electrolyte used ina a dry cell is

• Ammonium chloride

• Manganese dioxide

• Potassium hydroxide

• Sulphuric acid