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

of:

(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:

(a) CH₃CH₂CH₂CHO

(b) CH₃CH₂COCH₃

(c) CH₃CH₂CHO + HCHO

(d) CH₃CH₂COOH + HCOOH

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) O2^2-

(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?

(k_f.= 1.86, k_b 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?

(a) CH₃CH₂OSO₃H

(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) C_l2

(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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