Partial pressures and concentrations?

Let us take each one 40 grams . Then He 10 moles, Ne 2 moles , Ar 1 mole. Total moles 13 . For the same time diffusion V He/V Ne = PP of He x Square root of Mw of Ne / PP of Ne xsquare root of MW of He. This gives11.18/1 . or 5.59/0.5 .For the same diffusion time as above V He/V Ar = 31.6/1 or 15.8/0.5 dividing both by 2.825 gives 5.59/ 0.18. Moles of gases remaining after same time diffusion He 10-5.59 =4.41 , Ne 2- 0.5 = 1.5 , Ar 1-0.18=0.82. Hence PAr < PNe < PHe . None of your options are matching this one. 2) BaCl2 ( 10 millimoles) + H2SO4 (5 millimoles) -------> BaSO4 ( s) + 2 HCl. BaCl2 consumed is 5 millimoles and H2SO4 consumed is 5 millimoles . BaSO4 formed five millimoles is precipitated since it is insoluble salt. BaCl2 remaining (5 millimoles) ionises. Hence 5 millimoles of Ba^2+ present in 200 ml solution. In 1000 ml 25 millimoles Ba2+ present. Hence the concentration of Ba2+ is 0.025M . Among the gives gases may be SO2 deviates most because it is polar and others are nonpolar.