CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

Atomic mass of X and Z are 20 u and 40 u respectively. If X, Y and Z constitute Dobereiner’s triads, what should be the atomic mass of Y (in u)?

A
20
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
40
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
30
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
60
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C 30
According to Dobereiner's law of triads, the atomic mass of the middle element of the triad is equal to the arithmetic mean of the atomic masses of the other two elements.
Since, Y is the middle element of the triad, its mass should be the average of X and Z, that is,

Y=X+Z2=20+402=30 u

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Early Models of Periodic Table
CHEMISTRY
Watch in App
Join BYJU'S Learning Program
CrossIcon