Monday, May 16, 2011

Free chemistry online Practice Test for IIT JEE Entrance


Free chemistry online Practice Test for IIT JEE Entrance
IIT JEE Joint Entrance Exam Question Papers, Solutions & Online revision
Online IIT JEE Chemistry Complete Practice Test for IIT JEE
1. Carborundum is
(a) SiC
(b) AlCl3
(C) Al(SO4)3
(d) Al2O.2H2O
Ans. (a)
2. The number of unpaired electron in Mn 2+ is
(a) 4
(b) 5
(c) 6
(d) 7
Ans. (b)
3. The bond order of nitrogen molecule is
(a) 2
(b) 2.5
(c) 3
(d) None of these
Ans. (c)
4. Paracetamol is used as
(a) Antipyretic
(b) Analgesics
(c) Antiseptics
(d) Antibiotics
Ans. (a)
5. The number of water molecules in Mohr’s salt is
(a) 5
(b) 6
(c) 7
(d) 10
Ans. (b)
6. Which of the following is most basic?
(a) PH3
(b) AsH3
(c) SbH3
(d) NH3
Ans. (d)
7. Resonance structure of a molecule should have:
(1) Identical arrangement of atoms
(2) Nearly the same energy
(3) The same number of paired electron
(4) Identical energy
Ans. (a)
8. Oxidation number of Mn atom in KMnOis
(a) 6
(b) 7
(c) 14
(d) 5
Ans. (b)
9. Benzoic acid is dissolved in benzene, van’t Hoff factor will be
(a) 1
(b) 05
(c) 1.5
(d) 2
Ans. (b)
10. The Gibbs free energy for a reversible reaction at equilibrium is
(a) Positive
(b) Negative
(c) Zero
(d) Can be positive or negative
Ans. (c)
11. Which of the following electronic configuration is not possible ?
(a) 1s2, 2s2
(b) 3d10,4s,4p2
(c) 1s2, 2s2, 2p6
(d) 1s2, 2s2, 2p2, 3s1
Ans. (d)
12. Aldehydes and ketones can be distinguished by using
(a) Lucas reagent
(b) Tollen’s reagent
(c) Iodoform test
(d) Phenyl hydrazine
Ans. (b)
13. Which radioactive elements is inert gas?
(a) Ra
(b) Rn
(c) Pu
(d) Po
Ans. (b)
14. White phosphorus has:
(1) Six P—P single bonds
(2) Four lone pairs of electrons
(3) P—p—P angle of 60°
(4) Four P—P single bonds
Ans. (a)
15. Which is strongest acid?
(a) HClO
(b) HClO2
(c) HClO3
(d) HClO4
Ans. (d)
16. If phosphoric acid is allowed to react with sufficient quantity of NaOH, the product obtained is
(a) Na3PO4
(b) NaH2PO4
(c) Na2HPO4
(d) NaHPO3
Ans. (a)
17. The concentration unit, independent of temperature would be
(a) Molality
(b) Molarity
(c) Normality
(d) Weight per volume
Ans. (a)
18. Hexamethylenetetramine formed by the reaction of formaldehyde and
(a) Ammonia
(b) Primary amine
(c) Secondary amine
(d) Tertiary amine
Ans. (a)
19. During Lassaigne’s test N and S present M an organic compound changes into
(a) Na2S and NaCN
(b) NaSCN
(c) Na2SO4 and NaCN
(d) Na2S and NaCN
Ans. (a)
20. The quantum of light energy is
(a) Photon
(b) Neutron
(c) Electron
(d) Proton
Ans. (a)
21. When ethyl alcohol reacts with Cl2 in presence of NaOH, the product will be
(a) CH3Cl
(b) C2H5Cl
(c) Ccl3 CHO
(d) CHCl3
Ans. (d)
22. The oxidation number of Fe in FeO4 is
(a) + 8/3
(b) + 3/8
(c) – 8/3
(d) – 3/8
Ans. (a)
23. When lead nitrate is heated, it gives
(a) NO2
(b) PbO
(c) Both (a) and (b)
(d) NO
Ans. (c)
24. Size of colloidal particle is
(a) 10-9 m to 10-7 m
(b) 10-4 cm to 10-7 cm
(c) 10-6 m to 10-8 m
(d) 10-6 cm to 10-9 cm
Ans. (a)
25. Gun metal is an alloy of
(a) Mg, Sn, Zn
(d) Cu, Ni, Zn
(c) Cu, Sn, Zn
(C) Cu, Sb, Zn, Pb
Ans. (c)
26. Which are the ore of lead?
(1) Galena
(2) Cinnabar
(3) Cerussite
(4) Pyrolusite
Ans. (d)
27. sp—d2 hybridization is found in:
(1) SF6
(2) IF5
(3) IF7
(4) PF5
Ans. (b)
28. Which of the following substance is used as an antiknocking compound?
(a) Tetraethyl lead
(b) Lead tetrachloride
(c) Lead acetate
(d) Ethyl acetate
Ans. (a)
29. An orbital, in which n= 4, l= 2 is expressed as
(a) 4p
(b) 4d
(c) 4f
(d) 3d
Ans. (b)
30. Which of the following gas is maximum present in atmosphere?
(a) Ar
(b) CO2
(c) He
(d) Xe
Ans. (a)
31. Hydrolysis of acetonitrile in acidic medium gives
(a) CH3CH2NH2
(c) CH3CONH2
(d) CH3CHO
Ans. (b)
32. IUPAC name of C2H5CN is
(a) Ethyl cyanide
(b) Propionitrile
(c) Propane nitrile
(d) Cyano ethane
Ans. (c)
33. Which of the following is organometallic compound?
(a) CH3MgBr
(b) (CH3COO)Pb
(c) CH3COONa
(d) All of these
Ans. (a)
34. Which of the following is good conductor of electricity?
(a) Diamond
(c) Solid NaCl
(b) Graphite
(d) Wood
Ans. (b)
35. “Equal volumes of gases under similar conditions of pressure and temperature posses equal number of molecules”. This law is given by
(a) Avogadro
(b) Berzelius
(c) Gay Lussac
(b) Berzelius
(d) Graham
Ans. (a)
36. Most favorable condition for ionic bonding  are
(a) High charge, small cat ion, large anion
(b) Low charge, large cat ion, small anion
(c) Low charge, large cat ion, large anion
(d) High charge, small cat ion, small anion
Ans. (b)
37. In aluminothermite process ‘Al’ act as a/an
(a) Flux
(b) Oxidising agent
(c) Reducing agent
(d) Solder
Ans. (c)
38. The Lewis acids among the following are:
(1) BF3
(2) A1C13
(3) BeC12
(4) H2O
Ans. (a)
39. Which of the following is formed by the action of water on Na2O2?
(a) H2
(b) O2
(c) N2
(d) CO2
Ans. (b)
40. Glycerol has
(a) 1-primary-OH, 2-secondary-OH
(b) 2-primary-OH, 1 secondary-OH
(c) 3-primary-OH
(d) 1-primary-OH, 1 secondary OH, 1-tertiary OH
Ans. (b)
41. The long form of periodic table based on
(a) Atomic number
(b) Atomic mass
(c) Electronic configuration
(d) Effective nuclear charge
Ans. (c)
42. Catalyst increases the rate of reaction
(a) By decreasing Ea
(b) By increasing Ea
(c) By decreasing A
(d) By increasing entropy
Ans. (a)
43. Chlorobenzene is prepared commercially by
(a) Dow’s process.
(b) Decon’s process
(c) Raschig process
(d) Etard’s process
Ans. (c)
44. In a radioactive decay, an emitted electron comes from
(a) The nucleus of atom
(b) The orbit with principal quantum number
(c) The inner orbital of the atom
(d) The outer most orbit of the atom
Ans. (a)
45. Oleic, stearic, palmitic acids are
(a) Nucleic acids
(b) Amino acids
(c) Fatty acids
(d) None of these
Ans. (c)
46. The weight of one molecule of a compound C60H122 is
(a) 1.3 x 10-20g
(b) 5.01 x 10-21 g
(c) 3.72 x 1013g
(d) 1.4 x 10-21 g
Ans. (d)
47. The value of 1 amu is equal to
(a) 1.66 x 10-24 g
(b) 12.00 g
(c) 1.9924 x 10-24 g
(d) 1.0 g
Ans. (a)
48. Which of the following compound cannot reduce Fehling solution?
(c) HCHO
(d) CH3CHO
Ans. (b)
49. The metal present in vitamin B12 is
(a) Iron
(b) Manganese
(c) Cobalt
(d) Mercury
Ans. (c)
50. The product obtained, heating ethanol with conc. H2SO4 at 165°C-170°C, is
(a) (C2H5)2SO4
(c) CH2 = CH2
(d) C2H5HSO4
Ans. (c)


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