Questions in solutions

Select	Question
	The number of moles of a solute in its solution is 20 and total number of moles are 80. The mole fraction of solute is
	When $1.80gm$ glucose dissolve in $90gm$ of ${{H}_{2}}O$, the mole fraction of glucose is
	In a mixture of 1gm ${{H}_{2}}$and 8 gm${{O}_{2}},$the mole fraction of hydrogen is
	What volume of $0.8M$ solution contains $0.1$ mole of the solute
	The number of molecules in $4.25g$ of ammonia is approximately
	When a solute is present in trace quantities the following expression is used
	How many moles of water are present in $180g$ of water
	1000 g aqueous solution of $CaC{{O}_{3}}$ contains 10 g carbonate. The concentration of solution is
	10 grams of a solute is dissolved in 90 grams of a solvent. Its mass percent in solution is
	A aqueous solution of glucose is 10% in strength. The volume in which one gram mole of is dissolved will be