A noble metal is one which is inert and does not react with acids like HCl,HNO3,H2SO4. Select an option with a set of two noble metals.
A noble metal is one which is inert and does not react with acids like HCl,HNO3,H2SO4. Select an option with a set of two noble metals.
The explanation for the correct option:
Option(D) Gold (Au); Platinum (Pt)
- Gold (Au) and Platinum (Pt) are noble metals and are inert towards HCl,HNO3,H2SO4.
- Gold is unreactive because the nucleus of the gold is heavy such that the electrons must travel at the speed of light.
- The 6s electrons in the gold are less accessible for bonding and their energy is dissimilar to many reactants. This makes gold unreactive.
- Platinum is an inert metal that is capable of easily absorbing hydrogen.
- The platinum electrodes do not participate in redox reactions while the cell is working, unlike other metals Pure platinum metal is the most ductile of pure metals.
The explanation for the incorrect option:
A) Magnesium (Mg); Platinum (Pt)- In this pair, magnesium is highly reactive since it is an alkaline earth metal. but platinum is inert. hence magnesium reacts with the acids given.
B) Gold (Au); Iron (Fe) - In this pair, iron is reactive, hence it reacts with the acid given. but gold is inert.
C) Gold (Au); Zinc (Zn) -In this pair, zinc is reactive, hence it reacts with the acid given. but gold is inert.
Hence Option(D) Gold (Au); Platinum (Pt) are noble metals and are inert towards HCl,HNO3,H2SO4 .
The explanation for the correct option:
Option(D) Gold (Au); Platinum (Pt)
- Gold (Au) and Platinum (Pt) are noble metals and are inert towards HCl,HNO3,H2SO4.
- Gold is unreactive because the nucleus of the gold is heavy such that the electrons must travel at the speed of light.
- The 6s electrons in the gold are less accessible for bonding and their energy is dissimilar to many reactants. This makes gold unreactive.
- Platinum is an inert metal that is capable of easily absorbing hydrogen.
- The platinum electrodes do not participate in redox reactions while the cell is working, unlike other metals Pure platinum metal is the most ductile of pure metals.
The explanation for the incorrect option:
A) Magnesium (Mg); Platinum (Pt)- In this pair, magnesium is highly reactive since it is an alkaline earth metal. but platinum is inert. hence magnesium reacts with the acids given.
B) Gold (Au); Iron (Fe) - In this pair, iron is reactive, hence it reacts with the acid given. but gold is inert.
C) Gold (Au); Zinc (Zn) -In this pair, zinc is reactive, hence it reacts with the acid given. but gold is inert.
Hence Option(D) Gold (Au); Platinum (Pt) are noble metals and are inert towards HCl,HNO3,H2SO4 .
