Question

Que 5 ) Assertion : If one of the metal in a alloy is mercury the alloy is known as amalgam . Reason : Silver mercury amalgam is used in dentistry A ) Both A and R are true B ) Both A and R are false C ) A is true but R is false D ) A is false R is true​

Answer 1

An amalgam is a substance formed by the reaction of mercury with another metal. Almost all metals can form amalgams with mercury, the notable exception being iron. Silver-mercury amalgams are important in dentistry, and gold-mercury amalgam is used in the extraction of gold from ore.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Answer 2

If one of the metals in an alloy is mercury, the alloy is known as amalgam. Silver-mercury amalgam is used in dentistry. Therefore, Both A and R are true. Thus, the correct option is A.

Explanation:

• Alloys are admixtures of two or more metals combined in some proportions.  
• In dentistry, the cavities in teeth are usually filled with a dental filling that consists of liquid mercury and other metals such as silver, tin and copper.
• Therefore, Silver-mercury amalgam is used in dentistry.
• Hence, both assertion and reason are true.