Free chemistry practice test for Medical Engineering exams

Free chemistry practice test for Medical Engineering exams
Chemistry Model Questions and Practice Exam for Medical/ Engineering Entrance
Free Online Medical Engineering Entrance Test In Chemistry

1. Brillstein test is used to detect which of the following?

(a) Na

(b) CO2

(c) N2

(d) Cl

Ans. (d)

2. Acetone and iodine reacts to produce iodoform in presence of:

(a) KOH

(b) NaOH

(c) MgCO3

(d) CaCO3

Ans. (b)

3. The number of atoms in one unit cell of a face centered cubic lattice is

(a) 2

(b) 4

(c) 3

(d) 5

Ans. (b)

4. All the lanthanides show the common valency:

(a) 1

(b) 2

(c) 3

(d) 4

Ans. (c)

5. The hydrogen bond is not present in:

(a) Phenol

(b) Liquid HC1

(c) Water

(d) Liquid NH3

Ans. (b)

6. BF3 is a:

(a) Bronsted acid

(b) Bronsted base

(c) Lewis acid

(d) Lewis base

Ans. (c)

7. The number of sigma electrons in toluene are:

(a) 6

(b) 9

(c) 15

(d) 30

Ans. (d)

8. Benzaldehyde and alcoholic KCN reacts to produce which of the following:

(a) Ethyl benzoate

(b) Benzyl alcohol

(c) Benzoin

(d) Benzyl benzoate

Ans. (c)

9. In human body the percentage of sodium and iron is

(a) 0.15%and0.10%

(b) 0.15% and 0.004%

(c) 0.20% and 0.08%

(d) 0.20% and 0.04%

Ans. (b)

10. Root mean square velocity of a molecule is 1000 m/s. The average velocity of the molecule is:

(a) 455.55 m/s

(c) 921.58 m/s

(b) 675.55 m/s

(d) 1221.58 m/s

Ans. (c)

11. The oxidation number of Cr in K2Cr2O7 is:

(a) +3

(b) +5

(c) +6

(d) – 6

Ans. (c)

12. Which of the following oxide cannot act as a reducing agent?

(a) SO2

(b) CO2

(c) ClO2

(d) NO2

Ans. (b)

13. Which one of the following is used as an anti-knocking compound?

(a) Glycol

(b) Glycerol

(C) TEL

(d) Freon

Ans. (c)

14. A radioactive isotope has a half-life of 25 days. Starting with 4 g of isotope, the mass

Remaining after 75 days is

(a) 0.2 g

(b) 0.4 g

(c) 0.5 g

(d) 0.6 g

Ans. (c)

15. Bad smelling isocyanides are formed by heating alkali and chloroform with any:

(a) Primary amine

(b) Aliphatic amine

(c) Aromatic amine

(d) Tertiary amine

Ans. (a)

16. Dacron is a condensation polymer of ethylene glycol and:

(a) Phthalic acid

(b) Terephthalic acid

(c) Salicylic acid

(d) benzoic acid

Ans. (b)

17. Chloramines-T is used as an:

(a) Analgesic

(b) Antiseptic

(c) Antipyretic

(d) anti-inflatnatory

Ans. (b)

18. The amount of chlorine evolved by passing 14 of current in aqueous solution of NaCI for 30 minis:

(a) 0.84g

(b) 1.32g

(c) 3.34 g

(d) 5.47 g

Ans. (b)

19. For a reversible reaction the concentration of the reactants are doubled, then the equilibrium:

(a) Becomes 1/4

(b) Doubled

(c) Halved

(d) Same

Ans. (d)

20. AgNO3 does not produce any precipitate with chloroform because:

(a) AgNO3 is insoluble inCHCl3

(b) CHC13 does not ionize in water

(c) CHC13 is insoluble in water

(d) CHC13 is an organic compound

Ans. (b)

21. Hydrolysis of sucrose is known as:

(a) Hydration

(b) Saponification

(c) Esterification

(d) Inversion

Ans. (d)

22. Yndall effects are not found in:

(a) Sugar solution

(b) Gold solution

(c) Suspension

(d) Emulsion

Ans. (a)

23. The molecule having zero dipole moment is:

(a) H2O

(b) HBr

(c) HF

(d) CO2

Ans. (d)

24. Ethylene reacts with 1% alkaline solution of KMnO4 to produce:

(a) Ethylene glycol

(b) Formaldehyde

(c) Acetone

(d) Acetic acid

Ans. (a)

25. By passing H2S through an acidified solution of Ag, Cu and Zn, the precipitated element is:

(a) Ag

(b) Cu

(c) Zn

(d) All of these

Ans. (b)

26. Two molecules of acetic acid on heating with phosphorous pent oxide produce:

(a) Ethyl alcohol

(b) Acetic anhydride

(c) Acetyl pentaoxide

(d) Pentoxide of acetic acid

Ans. (b)

27. Which one of the following represents noble gas configuration?

(a) 1s², 2s²p², 3s² 3p⁶ 3d¹⁰, 4s² 4p⁶ 4d¹⁰, 5s², 5p⁶ 5d⁶, 6s²

(b) 1s², 2s² 2p⁶, 3s² 3p⁶ 3d¹⁰, 4s² 4p⁶ 4d¹⁰, 5s² 5p⁶ 5d¹, 6s²

(c) 1s², 2s² 2p⁶, 3s² 3p⁶ 3d¹⁰, 4s² 4p⁶ 4d¹⁰, 5s² 5p⁶

(d) 1s², 2s² 2p⁶, 3s² 3p⁶ 3d¹⁰, 4s² 4p⁶ 4f¹⁰, 5s² 5p⁶ 5d¹

Ans. (c)

28. The number of unpaired electrons in Ni(CO)₄ Is

(a) 0

(b) 1

(c) 3

(d) 4

Ans. (a)

29. Ethyl amine on treatment with HNO₂ produces:

(a) CH₃CHO

(b) C₂H₅OH

(c) CH₃COOH

(d) C₂H₅NO₂

Ans. (b)

30. Which one of the following is a correct statement?

(a) All metal nitrates’ are insoluble in water

(b) Solubility depends on temperature

(c) All metal nitrates are soluble in water

(d) All metal nitrates are soluble in alcohol

Ans. (c)

32. In benzene molecule carbon atoms are inclined at an angle of:

(a) 60°

(b) 109°, 28°

(c) 120°

(d) 180°

Ans. (c)

32. Which one of the following shows maximum value of paramagnetic behaviour?

(a) [Sc (CN)₆]^3-

(b) [Co (CN) ₆]^3-

(c) [Fe (CN) ₆]^4-

(d) [Cr (CN) ₆]^3-

Ans. (d)

33. Carbolic acid is:

(a) HCOOH

(b) CH₃COOH

(C) C₆H₅COOH

(d) C₆H₅OH

Ans. (d)

34. The solubility product of BaCl2 is 4 x 10^-9. Its solubility in mol/L is:

(a) 4 x 10^-9

(b) 4 x 10^-9

(c) 1 x 10^-9

(d) 1 x 10^-9

Ans. (c)

35. Which one can differentiate between C ₂H₅OH and CH₃OH?

(a) H₂O

(b) Na₂CO₃ + I₂

(c) NH₃

(d) HC1

Ans. (b)

36. Zinc and cold dil. HNO₃ reacts to produce:

(a) NO

(b) NO₂

(c) NH4NO₃

(d) ZnNO₃

Ans. (c)

37. The ratio of pi and sigma bonds in benzene is:

(a) 1:2

(b) 1:4

(c) 1:6

(d) 1:8

Ans. (b)

38. The chemical formula of plaster of Paris is

(a) CaSO₄ ½H₂O

(b) CaSO₄ H₂O

(c) CaSO₄ 2H₂O

(d) CaSO₄ 3H₂O

Ans. (a)

39. Which one of the following has square planar structure ?

(a) [Ni(CN) ₄] ^2-

(b) [Ni(CO) ₄]

(c) [NiCl₄] ^2-

(d) All of these

Ans. (a)

40. The oxidation number of chromium in potassium dichromate is:

(a) +2

(c) +6

(b) +4

(d) +8

Ans. (c)

41. The electronic configuration of most electronegative elements is :

(a) 1s², 2s² 2p⁵

(b) 1s², 2s² 2p⁴, 3s¹

(c) 1s², 2s² 2p⁶, 3s¹ 3p¹

(d) 1s², 2s² 2p⁶, 3s² 3p⁵

Ans. (a)

42. The molecular formula C3H9N cannot represent:

(a) 1° amine

(b) 2° amine

(c) 3° amine

(d) Quatemary salt

Ans. (d)

43. The bond length between C—C bond in sp2 hybridized molecule is:

(a) 1.2 Å

(b) 1.39Å

(c) 1.33 Å

(d) 1.54 Å

Ans. (b)

44. The energy ratio of a photon. of wavelength 3000 A and 6000 A is:

(a) 1:1

(b) 2:1

(c) 1:2

(d) 1:4

Ans. (b)

45. Gas equation PV = nRT is obeyed by ideal gas in:

(a) Adiabatic process

(b) Isothermal process

(c) Both (a) and (b)

(d) None of the above

Ans. (c)

46. Clemmensen’s reduction of ketones is carried out in:

(a) LiA1H₄ in H₂0

(b) Glycol and KOH

(c) Zn-Hg and HC1

(d) H₂ and Pd catalyst

Ans. (c)

47. The planar structure of BF3 can be explained by the fact that BF3 is

(a) sp-hybridized

(b) sp²-hybridized

(c) sp³-hybridized

(d) sp³d hybridized

Ans. (b)

48. Reduction of aniline with acetyl chloride in presence of NaOH produce:

(a) Aniline hydrochloride

(b) Acetanilide

(c) p-chloroaniline

(d) Areddye

Ans. (b)

49. The statement not applicable to chemisorptions is that it is

(a) Highly specific

(b) Independent of temperature

(c) Irreversible

(d) Slow

Ans. (b)

50. An unknown compound ‘D’ first oxidized to aldehyde and then acetic acid by a dilute solution of K₂Cr₂O₇ and H₂S0₄. The compound ‘D’ is

(a) CH₃OH

(b) C₂H₅OH

(c) CH₃CH₂COOH

(d) CH₃CH₂CH?

Ans. (b)

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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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