100 ml of 0.0018% (w/v) solution of Cl^$$-$$ ion was the minimum concentration of Cl^$$-$$ required to precipitate a negative sol in one h. The coagulating value of Cl^$$-$$ ion is _________ (Nearest integer)

For Freundlich adsorption isotherm, a plot of log (x/m) (y-axis) and log p (x-axis) gives a straight line. The intercept and slope for the line is 0.4771 and 2, respectively. The mass of gas, adsorbed per gram of adsorbent if the initial pressure is 0.04 atm, is ______ $$ \times $$ 10^–4 g.
(log 3 = 0.4771)

The mass of gas adsorbed, x, per unit mass of adsorbate, m, was measured at various pressures, p. A graph between $$\log {x \over m}$$ and log p gives a straight line with slope equal to 2 and the intercept equal to 0.4771. The value of $${x \over m}$$ at a pressure of 4 atm is :
(Given log 3 = 0.4771)