Monday, May 16, 2011

free online chemistry test


free online chemistry test
Free online chemistry practice test for all entrance exams
Free Online Chemistry Sample Paper
Free online chemistry practice test for PMT PET
1. How much of NaOH is required to neutralise 1500 cc of 0.1 N HCl (Na = 23)
(a) 60g
(b) 6g
(c) 4g
(d) 40g
Ans. (b)
2. Order of reaction is decided by:
(a) molecularity
(b) pressure
(c) temperature
(d) mechanism of reaction s well as relative concentration of reactants
Ans. (d)
3. Reaction of aniline with benzaldehyde is:
(a) polymerisation
(b) condensation
(c) addition
(d) substitution
Ans. (b)
4. The simplest way to check whether a system is colloidal is by:
(a) electrodialyis
(b) finding out particle size
(c) Tyndall effect
(d) Brownian movement
Ans. (c)
5. According to Fajan’s rule, covalent bond is favoured by:
(a) small cation and large anion
(b) large cation and small anion
(c) large cation and large anion
(d) small cation and small anion
Ans. (a)
6. The type of hybrid orbitals used by the chlorine atom in ClO2- is:
(a) sp3
(b) sp2
(c) sp
(d) none of these
Ans. (a)
7. The normality of a 2.3 M sulphuric acid solution is:
(a) 0.46 N
(b) 0.23 N
(c) 2.3 N
(d) 4.6 N
Ans. (d)
8. A 500 g tooth-paste sample has 0.2kg fluoride concentration. What is the concentration of fluoride in terms of ppm level?
(a) 250
(b) 200
(c) 400
(d) 1000
Ans. (c)
9. At 30°C the solubility of Ag2CO3 (K sp = 8 x 10-12) would be greatest in one litre
(a) 0.05 M Na2CO3
(b) 0.05 M AgNO3
(c) pure water
(d) 0.05 M NH3
Ans. (d)
10. Lithopone, a substitute of white lead is:
(a) BaSO4 + ZnS
(b) BaSO4 + ZnO
(c) PbCO3. Pb(OH)2
(d) none of the above
Ans. (a)
11. In Nessler’s reagent the active ion is:
(a) Hg+
(b) Hg2+
(c) [HgI]2-
(d) [Hg14]2-
Ans. (d)
12. The product obtained by means of HgSO4 + H2SO4 from 1-butyne would be:
Ans. (b)
13. The increasing order of acidity among phenol, p-methyl phenol, m-nitrophenol and p-nitrophenol is:
(a) phenol, p-methyl phenol, p-nitrophenol, m-nitrophenol
(b) p-methyl phenol, phenol, in-nitrophenol, – p-nitrophenol
(c) p-methyl phenol, m-nitrophenol, phenol, p-methyl phenol
(d) m-nitrophenol, p-nitrophenol, phenol, p-methyl phenol
Ans. (b)
14. Bismarck brown is example of:
(a) phthalein dye
(b) azodye
(c) anthraquinone dye
(d) nitro dye
Ans. (b)
15. Which of the following species planar shape?
(a) CH3-
(b) CH3+
(c) BF4-
(d) SiH4
Ans. (b)
16. Mond’s process is used for preparing:
(a) Ni
(b) Co
(c) NH3
(d) H2SO4
Ans. (a)
17. The most abundant salt of sodium is its:
(a) chloride
(b) nitrate
(c) sulphate
(d) phosphate
Ans. (a)
18. A smuggler could not carry gold by depositing iron on the gold surface since:
(a) gold is denser
(b) iron rusts
(c) gold has higher reduction potential than iron
(d) gold has lower reduction potential than iron
Ans. (c)
19. The ionic product of water will increase if:
(a) pressure is decreased
(b) H+ ions are added
(c) OH- ions are added
(d) temperature is increased
Ans. (d)
20. Which of the following is not isoelectronic?
(a) Na+
(b) Mg2+
(c) O22-
(d) C1-
Ans. (d)
21. From which of the following t-butyl alcohol is obtained by the action of methyl magnesium bromide?
(a) HCHO
(b) CH3COCH3
(c) CH3CHO
(d) CO2
Ans. (b)
22. The shape of gaseous SnCl2 is:
(a) Angular
(b) Linear
(c) Tetrahedral
(d) T-shaped
Ans. (a)
23. Which of the following metal is found in gun metal, monel metal and brass alloy?
(a) Zn
(b) Hg
(c) Fe
(d) Cu
Ans. (d)
24. According to Lewis the ligands are:
(a) Acidic in nature
(b) Basic in nature
(c) Neither acidic nor basic
(d) None of the above
Ans. (b)
25. Diamond is a:
(a) Ionic crystal
(b) Covalent crystal
(c) Metallic crystal
(d) Molecular crystal
Ans. (b)
26. An aqueous solution freezes at— 0.186°C, what is the elevation in boiling point?
(kf.= 1.86, kb 0.512)
(a) 0.186
(b) 0.512
(c) 0.05 12
(d) 0.86
Ans. (c)
27. The reference electrode is made from which of the following?
(a) ZnC12
(b) CuSO4
(c) Hg2Cl2
(d) HgCl2
Ans. (c)
28. Assuming fully decomposed, the volume of CO2 released at SW on heating 9.85 g of BaCO3(at. wt. of Ba = 137) will be:
(a) 1.12L
(b) 0.84L
(c) 2.24 L
(d) 4.06 L
Ans. (a)
29. The frequency of yellow light having wavelength 600 nm is:
(a) 5×1014Hz
(b) 5×1017Hz
(c) 2.5×1014Hz
(d) 2.5xl07Hz
Ans. (a)
30. Which of the following represents the correct sets of the four quantum numbers of 4 d electrons?
(a) 4, 3, 2, + 1/2
(b) 4, 2, 1, 0
(c) 4, 3, – 2, + 1/2
(d) 4, 2, 1, – ½
Ans. (d)
31. A mixture of iodine and sand can be separated by:
(a) Sublimation
(b) Crystallization
(c) Filtration
(d) Distillation
Ans. (a)
32. Number of gram of oxygen in 322 g of Na2SO4-10H20 is:
(a) 20.8
(b) 224
(c) 208
(d) 22.4
Ans. (b)
33. During the extraction of silver which of the following is formed?
(a) Na[Ag(CN) 2]
(b) Na2 [Ag(CN) 2]
(c) Na24[Ag(CN) 2]
(d) None of these
Ans. (a)
34. The electronic configuration of Sc21 is:
(a) 1s2, 2s2, 2p6, 3s2 3p6, 4s2 3d2
(b) Is2, 2s2, 2p6, 3s2 3p6, 4sO 3d3
(c) 1s2, 2s2 2p6, 3s2 3p6, 4s1 3d2
(d) 1s2, 2s2 2p6, 3s2 3p6, 4s2 3d1
Ans. (d)
35. The oxidation state of Fe in brown complex [Fe(H2O)5NO]SO4 is
(a) +3
(b) +4
(C) +2
(d) +1
Ans. (c)
Ans. (b)
36. The bond order in N+2 is:
(a) 50.5
(b) 11.2
(c) 5.6
(d) 30.2
Ans. (a)
37. When benzoic acid reacts with conc. HNO3 and H2SO4 the products is:
(a) 2, 4-dinitrobehzoic acid
(b) 3-nitrobenzoic acid
(c) 1, 3-dinitrobenzoic acid
(d) 2-nitrobenzoic acid
Ans. (b)
38. Which is correct statement about proton?
(a) Proton is the nucleus of deuterium
(b) Proton is alpha particle
(c) Proton is ionised hydrogen molecule
(d) Proton is ionised hydrogen atom
Ans. (d)
39. Which of the following conditions are necessary in preparation of aryl halides?
(a) Low temperature
(b) Absence of sunlight
(c) Presence of halogen carrier
(d) All of the above
Ans. (d)
40. Which of the following is formed as an intermediate in the conversion of ethanol to ethylene in presence of concentrated H2SO4?
(b) CH3CH
(c) (CH3CH2)2SO4
(d) CH3CH
Ans. (b)
41. An organic compound ‘A’ has the molecular formula C3H60. It undergoes iodoform test. When saturated with HC1 it gives ‘B’ of molecular formula C H1O ‘A’ and ‘B’ respectively are
(a) propanal and mesitylene
(b) propanone and mesityl oxide
(c) propanone and 2, 6-dimethyl-2, 5 heptadien-4-one
(d) propane and mesitylene oxide
Ans. (c)
42. TUPAC name of CH2 =CHCN is:
(a) ethenenitrile
(b) vinyl cyanide
(c) cyanoethene
(d) 2-propenenitrile
Ans. (c)
43. Which of the following halogen is purified by sublimation?
(a) F2
(b) Cl2
(c) Br2
(d) I2
Ans. (d)
44. Which one has the lowest boiling point?
(a) NH3
(b) PH3
(c) AsH3
(d) SbH3
Ans. (b)
45. Proteins on heating with concentratedHNO3 produce yellow colour, this test is known as
(a) Millon’s test
(b) Xanthoprotein test
(c) Hopkin’s test
(d) Ninhydrin test
Ans. (b)
46. The compound which is not coloured is:
(a) K4Fe(CN)6
(b) K3Fe(CN)6
(c) Na2CdCI4
(4) Na2CuCl4
Ans. (c)
47. Reduction of nitrobenzene by alkaline sodium arsenite forms
(a) aniline
(b) azobenzene
(c) hydrazobenzene
(d) azoxybenzene
Ans. (d)
48. The types of impurities present in bauxite ore are:
(a) Fe2O3
(b) Cu2O
(c) CO2
(d) SiO3
Ans. (a)
49. When calcium salts of dicarboxylic acids are subjected to dry distillation, a cyclic ketone having one carbon atom less is formed. This is called
(a) Clemmensen’s reduction
(b) Dieckmann’s method
(c) Wislicenus method
(d) Freund’s method
Ans. (c)
50. The physical adsorption of gases on the solid surface is due to:
(a) covalent bond
(b) hydrogen bond
(c) ionic bond
(d) van der Waals’ forces
Ans. (d)


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