Questions in solutions

Select	Question
	The mole percentage of oxygen in a mixture of 7.0g of nitrogen and 8.0g of oxygen is
	Solubility of $Ba{{F}_{2}}$ in a solution of $Ba{{(N{{O}_{3}})}_{2}}$will be represented by the concentration term
	When 5.0g of $BaC{{l}_{2}}$is dissolved in water to have 106 g of solution. The concentration of solution is
	Find out the molality of the molar sodium nitrate if density of solution is 1.25 g/cc
	Which of the following should be done in order to prepare $0.40\,M\ NaCl$ starting with $100ml$ of $0.30M\ NaCl$ (mol. wt. of $NaCl=58.5)$
	What is the molarity of a solution of HCl which contains 49% by weight of solute and whose specific gravity is 1.41
	Which statement is true for solution of $0.020M\ {{H}_{2}}S{{O}_{4}}$
	A solution of $CaC{{l}_{2}}$is 0.5 mol/litre, then the moles of chloride ions in 500 ml, will be
	If $25ml$ of $0.25M\ NaCl$ solution is diluted with water to a volume of $500ml$ the new concentration of the solution is
	3.0 molal $NaOH$solution has density of $1.110\,g/ml.$ The molarity of this solution is