A water drop and a mercury drop each of 1 mm radius are to be sprayed into one billion dros.Which is easier and why?

A drop of each of the ffollowing is placed separately on four slides.Which of them will not coagulate?

Two mercury droplets of radii 0.1 cm and 0.2 cm collapse into one single drop. What amount of energy is released ? The surface tension of mercury, T = 435.5 xx 10^-3 N m^-1

You have a bag of cotton and an iron bar, each indicating a mass of 100 kg when measured on a weighing machine. In reality, one is heavier than other. Can you say which one is heavier and why ?

Out of alcohol and water, which one is more acidic and why?

Solution A gives pink colour when a drop of phenopthalein indicator is added to it. Solution B gives red colour when a drop of methyl orange is added to it. What type of solutions are A and B and which one of the solutions A and B will have a higher pH value?

If light of wavelength 412.5 nm is incident on each of the metals given below, which one will show photoelectric emission and why?