Which of the following compounds is formed by the addition of a mineral acid to an aqueous solution of borax?

If the slope of one of the pair of lines represented by $2x^2 + 3xy + Ky^2 = 0$ is $2$,then the angle between the pair of lines is

Which sugar is represented by the structural formula shown below?

Which phylum is characterized by the presence of a central cavity known as the spongocoel?

Data Entry - Physics

$\begin{aligned} & A(\alpha, \beta)=\left[\begin{array}{ccc}\cos \alpha & \sin \alpha & 0 \\ -\sin \alpha & \cos \alpha & 0 \\ 0 & 0 & e^\beta\end{array}\right] \\ & \Rightarrow[A(\alpha, \beta)]^{-1}=\end{aligned}$