What is corrosion? Do gold ornaments corrode? Justify.

What is corrososion?Do gold omaments corrode? Justify you answer

Metals get attacked by substances around it such as moisture, acids, etc. Metal is said to 'corrode' due to this attack and the process is called corrosion. Many metals like iron, copper, silver, etc. get corroded. When iron is exposed to moist air, it undergoes corrosion and a reddish brown coloured solid layer is formed on its surface. Corrosion of iron, which is known as rusting, is a serious problem as enormous amount of money is spent every year to replace damaged iron. Similarly, copper reacts with moisture and. CO_(2) in air to form a green coloured coating of basic copper carbonate on its surface. Silver acquires a black colour when exposed to air containing H_(2)S due to the formation of silver sulphide on its surface. Based on the above paragraph, answer the following question. Do gold ornaments corrode? Justify.

State whether the following statements are True or False ( If a statement is false, correct it and rewrite it): Silver plated spoon, gold plated ornaments are the examples of alloying.

What is the oxidation number of gold in the complex [AuCl_4]^- ?

State which of the following are statements .Justify. In case of statement , state its truth value. Do you like mathematics?

A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution which was a fuming liquid. The bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?

Answer the following question in one sentence : What is done to prevent corrosion of metals?

In our society a woman is often blamed for not bearing a male child. Do you agree? Justify.

Electrons donated by chl-a molecules during the process of non-cyclic photophosphorylation do not come back to the same chlorophyll molecule. Justify.