Question

A' metal 'X' becomes black in colour when exposed to form 'Y' . It does not displace copper from CuSO4 and does not displace copper hydrogen with dilute acid. The metal is used in filling dental cavities. Identify the metal 'X' and compound 'y' . Give reasons for the properties?

Answer 1

Explanation:

X IS SILVER

Y IS SILVER SULPIDE

SILVER IS USED IN DENTAL CAVITIES AND FORMS SILVER SULPHIDE BLACK IN COLOR WHEN EXPOSED TO ATMOSPHERE AND REACTS WOTH SULPHUR TO BECOME BLACK IN COLOR