Important Questions on Some Basic Concepts of Chemistry A solution is prepared by dissolving 20 g NaOH 1250 mL 0 . 8 g / mL . Dissolving 120 g of a compound of (mol. wt. 60) in 1000 g of water gave a solution of density 1.12 g/mL. The molarity of the solution is : The mole fraction of a solvent in aqueous solution of a solute is 0.8 . k g - 1 The mole fraction of glucose C 6 H 12 O 6 0 . 1 . … … … The molality of solution containing 15.20 g of urea, (molar mass = 60) dissolved in 150 g of water is In which one of the following reactions, entropy decreases? The volume of 0.1 M strong dibasic acid sufficient to neutralize 1g of a base that furnishes 0.04 mole of O H - A litre of seawater (which weighs 1030 g 6 × 10 - 3 g ppm A solution (5 mL) of an acid X is completely neutralized by y mL of 1M NaOH. The same volume (y mL) of 1M NaOH is required to neutralize 10 mL of 0.6 M H 2 S O 4 What quantity (in mL 45 % 20 % 800 mL 29 . 875 % Dissolving 120 g 1000 g 1 . 15 g / mL . What is mole fraction of the solute in a 1 . 00 Calculate the concentration of the 2 % ( w / w ) NaCl The standard enthalpies of formation of H 2 O ( l ) CO 2 ( g ) - 286 kJ mol - 1 - 394 kJ mol - 1 CH 4 ( g ) - 891 kJ mol - 1 , CH 4 ( g ) A gas mixture contains 25 % He 75 % CH 4 The mole fraction of ethanol in water is 0 . 08 While combusting in air, 4 g H 2 36 μmole CO 2 CO 2 Which of the following is dependent on temperature? If Avogadro's number is A 0 H 2 SO 4 8 g NaOH 18 g H 2 O NaOH mol kg - 1 
