SINHA IIT CHEMISTRY

1-D-10, Talwandi, Commerce College Road , Kota Mo. 9314905055 , Ph. 0744-2422383

Mole concept (Solution-1)1. Fluoxmesterone, C

20H

29FO

3, is an anabolic steroid. A solution is prepared by

dissolving 10 mg of the steroid in 500 ml of water, 1.0 ml portion of this solution isdiluted to a final volume of 1.00 L. What is the resulting molarity ?(a) 1.19 × 10-10 (b) 1.19 × 10-7 (c) 5.95 ×10-8 (d) 2.38 × 10-11

2. The lead nitrate, Pb(NO3)

2 , in 25 ml of a 0.15 M solution reacts with all of the aluminium

sulphate, Al2(SO

4)

3, in 20 ml of solution. What is the molar concentration of the Al

2(SO

4)

3

?

3Pb(NO3)

2 (aq.) + Al

2(SO

4)

3 (aq.) 3PbSO

4 (s) + 2Al(NO

3)

3 (aq.)

(a) 6.25 × 10-2 M (b) 2.421 × 10-2 M (c) 0.1875 M (d) None3. Concentrated HNO

3 is 63 % HNO

3 by mass and has a density of 1.4 g/ml. How many

mililitres of this solution are required to prepare 250 mL of a 1.2 M HNO3 solution ?

(a) 18.0 (b) 21.42 (c) 20 (d) 14.214. The density of a 56 % by weight aqueous solution of 1-propanol (CH

3CH

2CH

2OH) is

0.888975 g/cm2. What is the mole fraction of the compound ?(a) 0.292 (b) 0.227 (c) 0.241 (d) 0.276

5. Three solutions X,Y, Z of HCl are mixed to produce 100 ml of 0.1 M solution. The molaritiesof X, Y and Z are 0.07 M, 0.12 M and 0.15 M respectively. What respective volumes of X,Y and Z should be mixed ?(a) 50 mL, 25 mL, 25 mL (b) 20 mL, 60 mL, 20 mL(c) 40 mL, 30 mL, 30 mL (d) 55 mL, 20 mL, 25 mL

6. What is the molarity of SO4

2- ion in aqueous solution that contain 34.2 ppm of Al2(SO

4)

3 ?

(Assume complete dissociate and density of solution 1g/mL)(a) 3 × 10-4 M (b) 2 × 10-4 M (c) 10-4 M (d) None

7. 50 mL of 20.8 % (w/V) BaCl2 (aq.) and 100 ml of 9.8 % (w/V) H

2SO

4 (aq.) solutions are

mixed. Molarity of Cl- ions in the resulting solution s (At.wt. of Ba = 137)(a) 0.333 M (b) 0.666 M (c) 0.1 M (d) 1.33 M

8. Molarity and molality of a solution of an liquid (mol.wt. = 50) in aqueous solution is 9 and 10respectively. What is the density of solution ?(a) 1 g/cc (b) 0.95 g/cc (c) 1.05 g/cc (d) 1.35 g/cc

9. An aqueous solution of ethanol has density 1.025 g/mL and it is 2 M. What is the molality ofthis solution?(a) 1.79 (b) 2.143 (c) 1.951 (d) None

10. 0.2 mole of HCl and 0.2 mole of barium chloride were dissolved in water to produce a 500mL solution. The molarity of the Cl- ions is(a) 0.06 M (b) 0.09 M (c) 1.2 M (d) 0.80 M

11. Calculate the mass of anhydrous HCl in 10 ml of concentrated HCl (density = 1.2 g/mL)solution having 37 % HCl by weight.

(a) 4.44 g (b) 4.44 mg (c) 4.44 × 10-3 g (d) 0.444 g12. 100 ml of 10 % NaOH (w/V) is added to 100 ml of 10 % HCl (w/V). The resultant solution

becomes.(a) alkaline (b) strongly alkaline (c) acidic (d) Neutral

13. Calculate the molality of 1 L solution of 80 % H2SO

4 (w/V), given that the density of the

solution is 1.8 g mL-1.(a) 8.16 (b) 8.6 (c) 1.02 (d) 10.8

14. How many mililitres of 0.1 M H2SO

4 must be added to 50 mL of 0.1 M NaOH to give a

solution that has a concentration of 0.05 M in H2SO

4 ?

(a) 400 ml (b) 200 ml (c) 100 ml (d) None15. 1 M HCl and 2M HCl are mixed in volume ratio of 4 : 1. What is the final molarity of HCl

solution ?(a) 1.5 (b) 1 (c) 1.2 (d) 1.8

id3088671 pdfMachine by Broadgun Software - a great PDF writer! - a great PDF creator! - http://www.pdfmachine.com http://www.broadgun.com

SINHA IIT CHEMISTRY

1-D-10, Talwandi, Commerce College Road , Kota Mo. 9314905055 , Ph. 0744-2422383

Mole concept (Solution-1) Answers

1. ( c) 2.(a) 3.(b) 4.(d) 5.(d) 6.(a) 7.(b) 8.(d) 9.(b) 10.(c) 11.(a) 12.(c)13.(a) 14.(c) 15.(c)