wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

Gold is plated with rhodium to give a base for mounting diamonds in modern jewellery. The rhodium-gold alloy consists of gold atoms in fcc structure with half the face centers being replaced by rhodium atoms. Formula of this alloy is :

A
Au5Rh3
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
AuRh3
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
Au3Rh5
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
Au3Rh
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is A Au5Rh3
In an fcc unit cell:
Number of atoms at corners (Au)=18×8=1
Number of face center atoms =12×6=3
Half of face centre atoms is Rh, other half is Au.
Au=1+32=52;Rh=32
Au5Rh3 is the formula of alloy.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Close Packing
CHEMISTRY
Watch in App
Join BYJU'S Learning Program
CrossIcon