chemistry

EAMCET PREVIOUS PAPER QUESTIONS FORM SOLUTIONS PART-1

1.During the depression of freezing point experiment an equilibrium is estalished       between the molecules of :

1) liquid solvent and solid solvent                    2) liquid solute and solid solvent

3) liquid solute and solid solute                        4) liquid solvent and solid solute

2.After removing the hard shell of an egg by dissolving in dil HCl, a semiper meable membrane is visible. If such an egg is kept in a saturated solution of common salt the size of the egg will :

1) shrink                                                            2) grow

3) remain the same                                            4) first shrink and then grow larger

3.Molality of an aqueous solution that produces an elevation of boiling point of 1.00 K at 1 atm pressure ( K_bfor water = 0.512 K.kg.mol^-1)

1) 0.512 M                   2) 0.195m                     3) 1.95m                       4) 5.12M

4.When 25 grams of a non-volatile solute is dissolved in 100 grams of water , the vapour pressure is lowered by 2.25 ×10^-1mm. If the vapour pressure of water at 20^oC is 17.5 mm, what is the molecular weight of the solute ?

1) 206                           2) 302                           3) 350                           4) 276

5.The volumes of two HCl solutions A(0.5N) and B(0.1N) to be mixed for preparing 2L of 0.2N HCl

solution
1) 0.5 L of A+1.5 L of B	2)	1.5 L of A+0.5 L of B
3) 1 L of A +1 L of B	4)	0.75   of A +1.25 L of B

6.In the redox reaction, 2 KMnO₄+ 3H ₂SO₄ +5H₂ C₂O₄ ¾¾®K₂SO₄ +2MnSO₄ +8H ₂ O +10CO₂  the

	volume of 0.1 M. KMnO4 required to oxidizes 25mL of 0.25mL of 0.25M  H 2C 2O4  solution
	1) 25 L	2) 125 mL		3) 25 mL			4) 1.25 L
7.	The vapour pressure of water at 23oC is 19.8 mm. 0.1 mole of glucose is dissolved in 178.2 gms of
	water. What is the vapour pressure (in mm) of the resultant solution?
	(1) 19.0	(2)	19.602	(3)	19.402		(4)	19.202
8.	In an oxidation reduction reaction, MnO-			ion is converted to		2Å . What is number of equivalents of
			4			Mn
	KMnO4	(molecular wt. = 158) present in 250 ml of 0.04 M KMnO4 ?
	(1) 0.02	(2)	0.05	(3)	0.04		(4)	0.07