The number of photons emitted by an monochromatic (single frequency)infrared range finder of power 1 mW and wavelength of 1000 nm, in 0.1 second is x * 10¹³. The value of x is_______. (Nearest integer)

(h = 6.63 * 10^-34 Js, c = 3.00 * 10⁸ ms^-1)

At 25°C the standard emf of cell having reactions involving two electrons change is found to be 0.295 V. The equilibrium constant of the reaction is :

Kindly consider the following 

Which of the following will not give ether as product :-

Which is most reactive towards electrophilic aromatic substitution reaction :-

Which one of the following ions is the most stable in aqueous solution ?

(At. No. Ti = 22, V = 23, Cr = 24, Mn=25)