Chemistry - Study Mode

[#701] In the electroplating of gold, the electrolyte used is
Correct Answer

(C) Gold sulphate

Explanation

Solution: Gold plating is a method of depositing a thin layer of gold onto the surface of another metal, most often copper or silver (to make silver-gilt), by chemical or electrochemical plating. Electroplating of gold is done using a sulphate/sulphite based electrolyte. This product is environment- and user friendly and moreover the electroplating rate is good.

[#702] The deterioration of a metal by an electrochemical process is commonly termed as
Correct Answer

(B) Corrosion

Explanation

Solution: Corrosion can be defined as the deterioration of materials by chemical processes.

[#703] Aqueous solution of which of the following is a good conductor of electricity
Correct Answer

(A) Ammonium acetate

Explanation

Solution: Aqueous solution of ammonium acetate is a good conductor of electricity.

[#704] The cathode of a lead storage battery is made up of
Correct Answer

(B) Lead

Explanation

Solution: The electrodes of the cells in a lead storage battery consist of lead grids. The openings of the anodic grid is filled with spongy (porous) Pb lead. The openings of the cathodic grid is filled with lead dioxide PbO 2 .

[#705] When a lead storage battery is discharged,
Correct Answer

(D) Sulphuric acid is consumed

Explanation

Solution: Discharging the stored energy relies on both the positive and negative plates becoming lead(II) sulphate and the electrolyte losing much of its dissolved sulfuric acid. Hence, sulphuric acid is consumed.