Which of the following fluorides does not exist?

Which of the following characteristics belongs to the Kingdom Animalia?

If $\frac{(1+i) x-i}{2+i}+\frac{(1+2 i) y+i}{2-i}=1$,then $(x, y)$ is equal to

If $A$ and $B$ are two sets,then $A \times B = B \times A$ if and only if

Two fair dice are rolled. The probability of the sum of digits on their faces being greater than or equal to $10$ is

If $x, y, z$ are all positive and are the $p$-th,$q$-th and $r$-th terms of a geometric progression respectively,then the value of the determinant $\left|\begin{array}{lll} \log x & p & 1 \\ \log y & q & 1 \\ \log z & r & 1 \end{array}\right|$ equals