The mole fraction of glucose (C₆H₁₂O₆ ) in an aqueous binary solution is 0.1. The mass percentage of water in it, to the nearest integer, is _______.

Let C_NaCl and C_BaSO4 be the conductances (in S) measured for saturated aqueous solutions of NaCl and BaSO₄, respectively, at a temperature T. Which of the following is false?

Henry’s constant (in kbar) for four gases $$\alpha $$, $$\beta $$, $$\gamma $$ and $$\delta $$ in water at 298 K is given below :

	$$\alpha $$	$$\beta $$	$$\gamma $$	$$\delta $$
KH	50	2	2 $$ \times $$ 10-5	0.5

(density of water = 10³ kg m^-3 at 298 K)
This table implies that :

The atomic number of the element unnilennium is :