Gold recovery from elektronics

Where is gold in electronics? (single choice)

• in IPS LCD monitors

• only in the output devices

• only in the input devices

• in various connectors and in integrated circuits

Why gold is placed in electronics? (single choice)

• because is semicontuctor

• because of very high corosive durability

• because of very high electronic conductivity

• because of very high corosive durability and very high electronic conductivity, together

What was the composition of the solution for separating gold from pcb's? (multiple choice)

• hydrochloric acid

• sodium metabisulfite

• borax

• copper chloride solution

• sodium chloride

What do You need, to dissolve gold? (single choice)

• hydrochloride acid

• aqua regia

• nitric acid

• it's practically impossible

Which chemical substance can precipitate gold from solution? (single choice)

• borax

• hydrochloric acid

• sodium metabisulfite

• any hydroxide

What should we add when melting gold? (single choice)

• borax

• any organic acid

• methylsulfonylmethane

• crude oil

What is the most important component of the final gold purification solution? (single choice)

• nitric acid

• sulphuric acid (VI)

• sulphuric acid (IV)

• any strong hydroxide