TEST

What is electrolysis?

• Electrolysis is an oxidation-reduction process that occurs in the heart of the electrodes when a direct current passes through the molten electrolyte or electrolyte solution.

• Electrolysis is the oxidation - reduction process that occurs at the electrode surface when alternating current passes through the molten electrolyte or electrolyte solution.

• Electrolysis is an oxidation - reduction process that occurs at the electrode surface when a direct current passes through the molten electrolyte or electrolyte solution.

• Electrolysis is an oxidation - reduction process that occurs at the electrode surface when there is no direct current passing through the molten electrolyte or the electrolyte solution.

When electrolysis saturated salt solution which has a membrane, which of the following phenomena occurs?

• Oxygen gas is released at the cathode, chlorine gas is released at the anode

•  Hydrogen gas is released at the cathode, chlorine gas is released at the anode

• Sodium metal escapes at the cathode, chlorine gas escapes at the anode

• Javen solution is created in an electrolytic cell

Fill in the missing words in the blanks:

Javen water is a substance ……., .... color, ... smell, … to be decomposed by light

• bleached, white, shocking, hard

• bleach, yellow, shocking, hard

• bleached, yellow, shocking, easy

• bleach, white, shocking, easy

Javel solution is a mixture consisting of two main components:

• Salt NaClO and Na2SO4

• Salt NaClO and CaCO3

• Salt NaCl and NaNO3

• Salt NaCl and NaClO

Which are two Stages of preparing javel solution by electrolysis of NaCl solution?

• Stage 1: NaCl electrolyzes into NaOH caustic soda and releases Hydrogen and Chlorine gas

• Stage 1: Chlorine gas escapes and reacts with NaOH solution to create Javel mixture

• Stage 2: NaCl electrolyzes into NaOH caustic soda and releases Hydrogen and Chlorine gas

• Stage 2: Chlorine gas escapes and reacts with NaOH solution to create Javel mixture

Fill in the blanks with the names of the parts in the structure of the electrolytic cell

Javel solution has strong detergent properties because

•  NaClO salt has strong oxidizing property

• NaCl salt has strong reducing property

• NaClO salt has strong reducing property

• NaCl salt has strong oxidizing property

Javel solution storage conditions:

• 2℃ – 8℃

• 2℃ - 6℃

• 2℃ - 5℃

• 2℃ - 4℃

Gas using water Javen should pay attention to (Can choose more than 2 answers)

• Avoid direct contact and be careful not to let them fall on the face and skin

• Let NaClO come into contact with metal utensils

• Do not drink, smell or inhale in any way.

• Mix javel solution with other disinfectants such as acid or ammonia.

• When using it to clean the room, you need to open the door

Application of javel solution (Can choose more than 2 answers)

• Used in medical examination and treatment

• Water treatment

• Clean the floor

• Remove stains on clothes, white carpets