Question

The constituents of this material that is yttrium, barium and copper are in ____________

(a) 1:1:1

(b) 1:2:2

(c) 1:2:3

(d) 1:2:1

This question was posed to me at a job interview.

The origin of the question is Super Conductors in section Nano Materials of Applied Chemistry

Answer 1

Correct choice is (c) 1:2:3

To explain I would say: The constituents of this material that yttrium, barium and copper are in 1:2:3 molar stoichiometric ratios and hence are called as 1:2:3 super conductors.