The amphoteric hydroxide is

$Br_2 + 2X^{-} \to 2Br^{-} + X_2$
$Cl_2 + 2Y^{-} \to 2Cl^{-} + Y_2$
The incorrect match regarding the above reactions is:

$\sum_{k=1}^{2n+1} (-1)^{k-1} k^2$ is equal to

The path difference between the two waves $y_1 = a_1 \sin \left( \omega t - \frac{2\pi x}{\lambda} \right)$ and $y_2 = a_2 \cos \left( \omega t - \frac{2\pi x}{\lambda} + \phi \right)$ is

The circle $4x^2 + 4y^2 - 12x - 12y + 9 = 0$

Which of the following is a part of the midbrain of a rabbit?