Why did the cross mark disappear?
A. The insoluble precipitate that is formed in the flask does not allow the light to pass through it to see the cross mark.
B. The resultant solution is dark coloured which does not allow the light to pass through it.
C. The resultant solution has high viscosity due to which it refracts the light to other angle.
D. The solution so formed has ability to absorb black colour hence black coloured cross is not seen.
Answer:A
Why did the cross mark disappear?
A. The insoluble precipitate that is formed in the flask does not allow the light to pass through it to see the cross mark. B. The resultant solution is dark coloured which does not allow the light to pass through it. C. The resultant solution has high viscosity due to which it refracts the light to other angle. D. The solution so formed has ability to absorb black colour hence black coloured cross is not seen.