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) Al₂ (SO₄)₃

(d) Al₂O₃ .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 KMnO₄ is

(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) 3d¹⁰,4s² ,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. sp³ —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

(b) CH₃COOH

(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)₂ 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?

(a) HCOOH

(b) CH₃COOH

(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

(b) CH₃COOH

(c) CH₂ = CH₂

(d) C₂H₅HSO₄

Ans. (c)

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