Which of the following oxoacids of phosphorus has the lowest oxidation state of phosphorus?

Which of the following is not produced during the electrolysis of brine solution?

Two point white dots are $1\, mm$ apart on a black paper. They are viewed by an eye with a pupil diameter of $3\, mm$. Approximately,what is the maximum distance in $m$ at which these dots can be resolved by the eye? [Take wavelength of light $\lambda = 500\, nm$]

If $\alpha, \beta, \gamma$ are the roots of $x^3+4x+1=0$,then the equation whose roots are $\frac{\alpha^2}{\beta+\gamma}, \frac{\beta^2}{\gamma+\alpha}, \frac{\gamma^2}{\alpha+\beta}$ is

Families are characterized on which of the following features of plant species?

Which of the following compounds on oxidation gives methyl ethyl ketone?