A solution of (-) –1 - chloro - 1 - phenylethane is toluene racemises slowly in the presence of a small amount of SbCl5, due to the formation of :
Assuming human pupil to have a radius of 0.25 cm and a comfortable viewing distance of 25 cm, the minimum separation between two objects that human eye can resolve at 500 nm wavelength is :
Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar?
Let C be the circle with centre at (1, 1) and radius = 1. If T is the circle centred at (0, y), passing through origin and touching the circle C externally, then the radius of T is equal to