Why do gold ornaments look new even after several years of use?

Metals X and Y can be recovered from the anode mud left behind after the electrolytic refining of copper metal. The coins made of metal X look new even after several years of use but the coins made of metal Y lose their shine gradually and get blackened soon. when metal X is alloyed with a small amount of metal Y, it becomes hard and hence suitable for making ornaments. what are metals X and Y? Also state the colour of metal X.

Give reason for the following (i) Iron grills are frequently painted. (ii) Gold ornaments retain their lustre even after several years of use.

Give reasons for the following : Ionic compounds have high melting points and boiling points. (ii) Ionic compounds conduct electricity in molten state. (iii) Ionic compounds are solids at room temperature and are somewhat hard. (iv) Ionic grills are frequently painted. (v) Gold ornaments retains their lustre even after several years of use.

Why do clouds generally look white ?

Why do clouds generally look white ?

Seema wants to purchase a gold ornament. Gold ornaments are not made of pure gold but they are usually made up of 22 carat. Her cousin Isha asks her to check hallmark while purchasing jewellery. Why does she ask to do so?

Read the following and answer any four questions Sohan 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. The bangles sparkled like new but their weight was reduced drastically. The lady was sad but after a futile argument, the man beat a hasty retreat. Which of the following is used for dissolution of gold?