Question

Assertion:Gold and silver are used to make jewellery.
Reason:Gold and silver are highly inactive metals. Therefore, they do not undergo corrosion due to attack by moisture and atmospheric gases.
A.Both assertion and reason are correct and reason is the correct explanation for assertion.
B.Both assertion and reason are correct but reason is not the correct explanation for assertion.
C.Assertion is correct but reason is incorrect.
D.Both assertion and reason are incorrect.

Answer 1

First we must know the basic properties of elements that can be used for making jewellery. The properties are that it should be lustrous which means they should be shiny, and should be able to mould easily into any shape and resistant to corrosion because it should not tarnish. Gold and silver are less active metals which means they do not react with water, acids or air.

Complete step-by-step answer: Gold and silver are malleable and ductile and hence they can be transformed into any shape. A malleable material means the one in which a thin sheet can be easily formed by hammering or by rolling. Or in other words we can say the material has the ability to deform under very compressive stress. Whereas ductility is the ability of a material to deform under tensile stress. Hence, a ductile material is a material that can easily be stretched into a wire when it is pulled.
They are very shiny metals which means they are lustrous and are non - corrosive which means it does not react with air, water or acids and forms oxides because they are unreactive metals and hence they do not tarnish thereby retaining their lustre and shine for years.
Due to these properties gold and silver are called noble metals and they are used in jewelers.

Hence we can say that the correct answer is A which states that both assertion and reason are correct and reason is the correct explanation for assertion.

Note: Gold is a very good conductor of heat and electricity and the metal does not get affected by air and most reagents. This element is corrosion resistant and is present in deposits of alluvium and veins. Silver is used in jewellery, silverware and decorative items. It has the highest electrical conductivity of all the metals, but the high cost of it has restricted us from using it in all electrical devices. It is also a very good conductor of both electricity and heat.