What is Hydrometallurgy ?

What is meant by hydrometallurgy ?

Assertion : Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal. Reason : Copper is extracted by hydrometallurgy.

Copper can be extracted by hydrometallurgy but not zinc. Explain.

True of False : Silver is extracted by by hydrometallurgy.

What is hymen? What are the functions of hymen?

What is allergy? What are its symptoms?

What is Tyndall effect ? What is the cause of it ?

What is electric energy ? what is its SI unit?