SMATEE TEST SERIES 4 CHEMISTRY

1.  If 250 ml of 0.25 M NaCl solution is diluted with water to a volume of 500 ml, the new concentration of the solution is

a) 16 7
b) 0.125 M    
c) 0.082 M
d) 0.016

2. The boiling point of benzene is 353.23 K. When 1.80 g of a non volatile solute was dissolved in 90 g of benzene, the boiling point is raised to 354.11 K. Calculate the molar mass of the solute ( K_b for benzene = 2.53 K kg mol^-1)

a) 57.5 g
B. 64.2 g           
c) 79. 6 g
d) 91.3 g

3.  In comparison to a 0.01 M solution of glucose, the depression in freezing point of a 0.01 M Mg Cl₂ solution is

a) the same
b) about twice
c) about three times
d) about six times

4. Colligative properties depends on

a) The nature of the solute particles dissolved in solution
b) The number of solute particles in solution
c) The physical properties of the solute particles dissolved in solution
d) The nature of solvent particles

5. Which of the following aqueous solutions should have the highest boiling point

a) 1.0 M NaOH
b) 1.0 M NH₄NO₃
c) 1.0 M KNO₃
d) 1.0 M Na₂SO₄

6. A solution of sulphuric acid in water exhibits

a) negative deviation from Raoult’s law
b) positive deviation from Raoult’s law
c) ideal properties
d) the applicability of Henry’s law

7. A solution has 4 : 2 molar ratio of propane to heptane. If their P° values are 200 and 400 mm Hg. Calculate the mole fraction of heptane in vapour phase

a) 0.1
b) 0.3
c) 0.5
d) 0.7

8. Acetic acid dimerized in benzene upto 10%, find Van’t Hoff factor ‘i’

a) 2.12
b) 1.26
c) 0.95
d) 0.0

9. Homolytic fission of a covalent bond leads to the formation of

a) electrophile
b) nucleophile
c) free radical
d) carbocation

10. Aniline is separated from aniline-water mixture by

a) crystallization
b) steam distillation
c) solvent extraction
d) sublimation

11. The most stable carbocation is:

a) CH₃⁺
b) (CH₃)₃C⁺
c) CH₃CH₂CH₂⁺
d) (CH₃)₂CH⁺

12. Hyperconjugation involves overlap of the following

a) sigma – sigma
b) sigma – p
c) p – p
d) pi – pi

13. Which of the following compounds will be suitable for Kjeldahl’s method for nitrogen estimation?

14. Benzene molecule has

a) 6sigma-bonds and 6 π-bonds
b) 12sigma-bonds and 6 π – bonds
c) 6sigma- bonds and 3 π- bonds.
d) 12sigma -bonds and 3 π- bonds

15. Which of the following is an electrophile ?

a) CN^–
b) ROH
c) AlCl₃
d) NH₃   

16. Methoxy methane and ethanol are

a) Functional isomers
b) Optical isomers
c) Position isomers
d) Chain isomers

17. CO is isolectronic with

a) SnCl₂
b) NO⁺
c) NO₂^–
d) O₃

18. For which of the following hybridization the bond angle is maximum ?

a) sp
b) sp²
c) sp³
d) dsp²

19. What is the Geometry of ClF3 (including the lone pair of electrons)

a) See saw
b) T shape
c) Trigonal bipyramidal
d) Tetrahedral

20. The shape of XeF4 molecule is

a) Octahedral
b) Square planar
c) Tetrahedral
d) Trigonal bipyramidal