$A$ thin liquid film formed between a $U$-shaped wire and a light slider supports a weight of $1.5 \times 10^{-2} \, N$ (see figure). The length of the slider is $30 \, cm$ and its weight is negligible. The surface tension of the liquid film is (in $, N/m$)

Which of the following statements is incorrect regarding physisorption?

On a new scale of temperature (which is linear) called the $W$ scale,the freezing and boiling points of water are $39\,^{\circ}W$ and $239\,^{\circ}W$ respectively. What will be the temperature on the new scale,corresponding to a temperature of $39\,^{\circ}C$ on the Celsius scale? ............ $^{\circ}W$

In the given circuit, the current flowing through it is: (in $ A$)

If tangents are drawn from any point on the circle $x^2+y^2=25$ to the ellipse $\frac{x^2}{16}+\frac{y^2}{9}=1$,then the angle between the tangents is

During which of the following reactions will a gaseous product $NOT$ be produced?