Grade 9 online quiz

Which of the liquids given below is a non electrolyte?

• Sodium Chloride solution

• Slightly acidified water

• Copper Sulphate solution

• Distilled water

The action not taking place when an electric current is passed for a short time through the set up shown in the diagram.

• Deflection in the ammeter

• Copper colour forming on negative electrode

• Evolution of gas at positive electrode

• Copper Sulphate solution turns dark blue

Action that should not be done when electroplating

• Using the metal that is plated as the positive electrode

• Using the ornament that is plated as the negative electrode

• Electrolysing a solution of a salt of the metal that is electroplated.

• Elecrtrolyte used should be concentrated salt solution

Electricity is not conduct through a sodium Chloride crystals because

• It is not an ionic compound

• There is no mobile ions

• It is not a colourd salt

• It is easily soluble in water

The solution that can be used as the electrolyte when gold plating a silver ornament

• Gold Cyanide

• Silver Nitrate

• Copper sulphate

• Slightly acidified water.

Select the correct statement, from the following statements.

• Solid sodium chloride (NaCl) is an electrical conductor

• Fused sodium chloride (NaCl) does not conduct electricity

• An aqueous solution of sodium chloride (NaCl) conducts electricity

• Solid sodium chloride (NaCl) consists of mobile ions.

Which of the following statement is correct about electroplating?

• To make a high quality electroplating, the concentration of the electrolyte must be high

• To electroplate a copper ring with silver, the copper ring must be kept as the positive electrode,

• To electroplate a copper ring with silver, a copper salt must be taken as the electrolyte

• When electroplating a copper ring with silver, the positive electrode erodes gradually

You are required to coat a silver bangle with gold. Which of the following set of substances is most suitable for it?

• A silver rod, a very dilute solution of a silver salt

• A gold rod, a very dilute solution of a silver salt

• A gold rod, a very dilute solution of a gold salt

• A gold rod, a concentrated solution of a gold salt