Free Chemistry Online Practice Tests

Free Chemistry Online Practice Tests
FREE online interactive quizzes on Chemistry 10+2 level
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Free online chemistry practice test for engineering/medical entrance exams

1. Which of the following varies with change in temperature?

(a) Mole fraction

(b) Molality

(c) % (w/w)

(d) Formality

Ans. (d)

2. Which of the following is not a chalcogen?

(a) Se

(b) O

(c) S

(d) Na

Ans. (d)

3. A radioactive substance decays to 3/4 of its original value in 2h. The half-life of the substance is:

(a) 60 mm

(b) 30 mm

(c) 90 mm

(d) 15 mm

Ans. (a)

4. A compound of vanadium has a magnetic moment of 1.73 BM. What is the oxidation number of vanadium in the compound?

(a) +4

(b) +3

(c) +2

(d) +1

Ans. (a)

5. A bottle of dry ammonia and a bottle of dry hydrogen chloride connected through a long tube are opened simultaneously at both ends, the white ammonium chloride ring first formed will be:

(a) At the centre of tube

(b) Near the hydrogen chloride bottle

(c) Near the ammoni bottle

(d) Throughout the length of the tube

Ans. (b)

6. With the help of which reaction cyclohexanone is converted into cyclohexane?

(a) Wurtz-Fittig reaction -

(b) Wolff-Kishner reduction

(c) Tischenko reaction

(d) Stephen’s reaction

Ans. (b)

7. Benadryl is used as:

(a) Antiseptic

(b) Disinfectant

(c) Analgesic

(d) Antihistamine

Ans. (d)

8. Azeotropic mixture of HC1 and water has:

(a) 80% HC1

(b) 20.2% HC1

(c) 60% HC1

(d) 40.8% HC1

Ans. (b)

9. The molal freezing point constant for water is1.86°C per mol therefore, the freezing point of 0.M NaCl solution in water is expected to be:

(a) —1.86°C

(b) —0.186°C

(c) +0.372°C

(d) —0.372°C

Ans. (d)

10. The percentage by weight of hydrogen in C₂H₅OH is:

(a) 20 %

(b) 23.08 %

(c) 13.04%

(d) 10.15%

Ans. (c)

11. Real gas will approach the behaviour of an ideal gas at:

(a) Low temperature and low pressure

(b) High temperature and low pressure

(c) High temperature and high pressure

(d) The critical point

Ans. (b)

12. 0.45 g acid of molecular weight 90 was neutralise by 20 mL of 0.5N KOH. The basicity of the acid is:

(a) 2

(b) 4

(c) 1

(d) 3

Ans. (a)

13. Which of the following is not possible?

(a) n=2, l=1, m=0

(b) n=2, l=0, m= -1

(c) n=3, l=0, m=0

(d) n=3, l=1, m= -1

Ans. (b)

14. The relationship which describes the variation of vapour pressure with temperature is known as:

(a) Kirchhoff’s law

(b) Clausius-Clapeyron equation

(c) EquationHesss law

(d) Arrhenius equation

Ans. (b)

15. Phenol is more acidic than alcohol because:

(a) Phenol is more soluble in polar solvents

(b) Alcohol does not lose hydrogen atom

(c) Pentoxide ion is stabilized by resonance

(d) Pentoxide ion do not exhibit resonance

Ans. (c)

16. The element having highest electron affinity is:

(a) Bromine

(b) Iodine

(c) Fluorine

(d) Chlorine

Ans. (d)

17. Bakelite is prepared by the reaction between:

(a) Phenol and formaldehyde

(b) Urea and formaldehyde

(c) Ethylene and glycol

(d) Tetra ethylene and glycol

Ans. (a)

18. Which one of the following is a conjugated protein?

(a) Phosphoprotein

(b) Glycoprotein

(c) Chromoprotein

(d) All of the above

Ans. (d)

19. Iodine test is shown by

(a) Glucose

(c) Glycogen

(b) Starch

(d) Polypeptide

Ans. (b)

20. A fruity smell is obtained by the reaction of  ethanol with:

(a) CH₃COCH₃

(b) PCl₅

(c) CH₃COOH

(d) CH₃CHO

Ans. (c)

Directions: In the following questions more than one of the answers given may be correct. Select the correct answers and mark it according to the code.

Code:

(a) 1, 2 and 3 are correct

(b) 1 and 2 are correct

(c) 2 and 4 are correct.

(d) 1 and 3 are correct

21. The enthalpy change for the process

(1) Heat of vaporisation

(2) Heat of sublimation

(3) Heat of atomisation

(4) Heat of allotropic change

Ans. (c)

22 The anodic mud obtained during electro refining of Cu contains:

(1) Ag

(2) Fe

(3) Au

(4) Zn

Ans. (d)

23. Which is natural polymer?

(1) Cellulose

(2) Protein

(3) SBR

(4) PMMA

Ans. (b)

24. Resolution can be done by:

(1) Mechanical method

(2) Biochemical method

(3) Chemical method

(4) Dialysis method

Ans. (a)

25. Aldehyde and ketone can be distinguished by:

(1) Tollen’s reagent

(2) Fehling’s reagent

(3) 2, 4 -DNP

(4) NaHC0₃

Ans. (b)

26. Which elements can detect by flame test?

(1) Na

(2) Ca

(3) Ba

(4) Be

Ans. (a)

27. The raw material in Solvay process is:

(1) NaC1

(2) CaCO3

(3) NH4C1

(4) CO2

Ans. (a)

28. Which are the acidic oxides?

(1) CO2

(2) SO2

(3) MgO

(4) AI2O3

Ans. (b)

29. Monodentate ligands are:

(1) H2O

(2) NH3

(3) EDTA

(4) Ethylene diamine

Ans. (b)

30. The greater stability of tert-butyl carbocation over methyl carbocation can be explained on the basis of:

(1) +1 effect of the methyl group

(2) Hyperconjugation effect of the methyl group

(3) Electromeric effect of the methyl group

(4) —I effect of the methyl group

Ans. (b)

31. Graphite is used:

(1) In making electrodes

(2) As lubricant

(3) As crucible in lead pencil

(4) In the manufacture of glass

Ans. (a)

32. IInd group basic radicals are:

(1) Pb

(2) Ba

(3) Sb

(4) Ni

Ans. (d)

33. Which are colligative properties?

(1) Osmotic pressure

(2) Pressure

(3) Elevation in boiling point

(4) Volume

Ans. (d)

34. Which are sulphide ores?

(1) Zinc blende

(2) Galena

(3) Cryolite

(4) Rutile

Ans. (b)

35. Disaccharide sugars are:

(1) Maltose

(2) Glucose

(3) Sucrose

(4) Raffinose

Ans. (d)

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Chemistry practice test for C.B.S.E. All India Engineering Entrance Exam. (AIEEE)

Chemistry practice test   for C.B.S.E. All India Engineering Entrance Exam. (AIEEE)
Free online AIEEE Practice Test chemistry
AIEEE sample paper Chemistry
All India Engineering Entrance Examination (AIEEE) is an all-India common entrance examination conducted by CBSE.This is a sample Paper on subject of Chemistry

1. Cyanide process is used for extraction of:

(a) Ag

(b) Ni

(c) Pt

(d) Zn

Ans. (a)

2. An acid solution of 0.005 M has a pH of 5. The degree of ionisation of acid is:

(a) 0.1 x 10^-2

(b) 0.2 x 10^-2

(c) 0.5 x 10^-4

(d) 0.6 x 10^-6

Ans. (b)

3. Which metal gives hydrogen gas on heating with hot concentrated alkali?

(a) Ag

(b) Ni

(c) Zn

(d) Cu

Ans. (c)

4. The conversion of ethyl chloride into diethyl ether takes place by:

(a) Williamson’s synthesis

(b) Perkin’s reaction

(c) Wurtz reaction

(d) Grignard reaction

Ans. (a)

5. CHCl₃ + C₆H₅NH₂ + 3NaOH ← A+3B+3C

In the above reaction, the product ‘A’ is:

(a) Chlorobenzene

(b) Phenyl isocyanides

(c) Phenyl cyanide

(d) Phenyl chloride

Ans. (b)

6. A gas is found to have a formula [CO] _x. Its vapour density is 70, the x is:

(a) 3.0

(b) 3.5

(c) 5.0

(d) 6.5

Ans. (c)

7. Which of the following is used as purgative?

(a) HgS

(b) Hg₂Cl₂

(c) HgC1₂

(d) ZnSO₄

Ans. (b)

8. Least stable oxide of chlorine is:

(a) Cl₂O

(b) ClO₂

(c) C1₂O₇

(d) ClO₃

Ans. (a)

9. The sides of safety matches contains

(a) Red phosphorus + sand powder

(b) P₄S₃

(c) Ca₃ (PO) ₄ + glass pieces

(d) KC1O₃, KNO₃, sulphur + antimony

Ans. (a)

10. Chemically aspirin is known as:

(a) Salicylic acid

(b) Salicylaldehyde

(c) 2-acetoxybenzoic acid

(d) Phenyl salicylate

Ans. (c)

11. Borax is represented as:

(a) Na₂B₄O₅(OH) ₄.8H₂O

(b) Na₂B₄O_7.8H₂O

(c) Na₂B₄O_7. 4H₂O

(d) Na₂B₄O₇.7H₂O

Ans. (a)

12. Which cannot be oxidized by H₂O₂ ?

(a) Na₂5O₃

(b) PbS

(c) KI

(d) O₂

Ans. (d)

13. The gas not absorbed by coconut charcoal is:

(a) He

(b) Ne

(c) Ar

(d) Kr

Ans. (a)

14. K1 and CuSO₄ solutions on mixing produce:

(a) Cu₂1₂ + K₂SO₄

(b) Cu₂1₂ + I₂ + K₂SO₄

(c) Cu1₂ ÷ K₂SO₄

(d) Cu1₂ + I₂ + K₂SO₄

Ans. (b)

15. Vitamin B12 contains:

(a) Co

(b) Mn

(c) Mg

(d) Fe

Ans. (a)

16. Water glass is:

(a) Glass made of water

(b) Sodium silicate

(c) Calcium format

(d) Pyrex glass

Ans. (b)

17. Purification of alumina takes place by:

(a) Bosch process

(b) Hall’s process

(C) Hoope’s process

(d) Quartation process

Ans. (b)

18. What will be the product in the following reaction?

Ans. (a)

19. What will be the TUPAC name of given compound?'

(a) 2, 5-diethyl-4-methylhexane

(b) 3, 4, 6-trimethyloctane

(c) 2, 5, 6-trimethyloctane

(d) 3, 5-dimethyl-6-ethylheptane

Ans. (b)

20. The correct order of hybridisation of the central atom in the following species:

NH₃, [PtCI₄] ^2-, PCl₅ and BCl₃ is:

(a) dsp², dsp³, sp², sp³

(b) sp³, dsp², sp³d, sp²

(c) dsp², sp2, sp3, dsp3

(d) dsp², sp³, sp², sp³

Ans. (b)

21. Unit of mole fraction is:

(a) mol-L

(b) mol/L²

(c) mol/L

(d) Dimensionless

Ans. (d)

22. The equivalent weight of phosphoric acid (H₃PO₄) in the reaction:

NaOH + H₃PO₄ → NaH₂PO₄ + H₂Ois:

(a) 59

(b) 49

(c) 25

(d) 98

Ans. (d)

23.

Ans. (c)

24. DDT is prepared by reacting chlorobenzene with:

(a) CHC1₃

(b) CCl₃ CHO

(c) CCl₄

(d) C₂H₆

Ans. (b)

25. According to Heisenberg’s uncertainty principle, the product of uncertainties in position and ‘velocities for an electron of mass 9.1 xl0^-31 kg is

(a) 2.8 x10^-3 m²s^-1

(b) 3.8x 10^-5 m²s^-1

(c) 5.8 x 10^-5 m²s^-1

(d) 6.8 x 10^-6 m^2-1

Ans. (c)

26. The state of hybridisation of B in BCI₃ is:

(a) sp

(b) sp²

(c) sp³

(d) sp²d²

Ans. (b)

27. The significant figures in 3400 are:

(a) 2

(b) 5

(c) 6

(d) 4

Ans. (a)

28. For a Carnot engine, the source is at 500 K and the sink at 300 K. What is efficiency of this engine?

(a) 0.2

(b) 0.4

(c) 0.6

(d) 0.3

Ans. (b)

29. If 20 g of a solute was dissolved in 500 mL of water and osmotic pressure of the solution was found to be 600 mm of Hg at 15°C, then molecular weight of the solute is

(a) 1000

(b) 1200

(c) 1400

(d) 1800

Ans. (b)

30. Work done during isothermal expansion of one mole of an ideal gas from 10 atm to 1 atm at300 K is:

(a) 4938.8J

(b) 4138.8J

(c) 5744.1J

(d) 6257.2J

Ans. (c)

31. The number of sodium atoms in 2 moles of sodium ferrocyanide is:

(a) 12 x 10²³

(b) 26 x 10²³

(c) 34 x 10²³

(d) 48 x 10²³

Ans. (d)

32. According to Bohr’s principle, the relation between principle quantum number (n) and radius of orbit is

(a) r α n

(b) r α n²

(c) r α 1/n

(d) r α 1/n²

Ans. (b)

33. For an exothermic reaction, the value of:

(a) Δ E is negative

(b) Δ H is positive

(c) Δ H is negative

(d) Δ H equal to zero

Ans. (c)

34. The number of lattice arrangements in different crystal systems are

(a) 8

(b) 7

(c) 9

(d) 14

Ans. (b)

35. If equilibrium constants of reaction,

N₂+ O₂ = 2NO is K₁, and

1/2N₂ + 1/2O₂ =NO is K₂, then:

(a) K1 = K₂

(b) K₂ = √K₁

(c) K₁= 2K₂

(d) K₁ = 1/2K₂

Ans. (b)

36. Wolframite ore is separated from tins tone ore by the process of:

(a) Roasting

(b) Electromagnetic

(c) Smelting

(d) Calcinations

Ans. (b)

37. If solubility product of HgSO₄ is 6.4 x 10, then its solubility is:

(a) 8 x 10^-3 mol/L

(b) 6.4 x 10^-5 mol/L

(C) 6.4 x 10^-3 mol/L

(d) 2.8 x 10^-6 mol/L

Ans. (a)

38. Disintegration constant for a radioactive substance is 0.58 per hour. Its half-life period is:

(a) 82h

(b) 5.2h

(c) 1.2h

(d) 2.4h’

Ans. (c)

39. The rate constant of a reaction depends upon:

(a) Extent of reaction

(b) Time of reaction

(c) Temperature of the system

(d) Concentration of the system

Ans. (c)

40. A cylinder of 5 L capacity, filled with air at NTP, is connected with another evacuated cylinder of 30 L capacity. The resultant air pressure in both the cylinders will be:

(a) 10.8cm of Hg

(b) 14.9cm of Hg

(c) 21.8cm of Hg

(d) 38.8cm of Hg

Ans. (a)

41. The maximum number of hydrogen bonds formed by a water molecule in ice is :.

(a) 4

(b) 5

(c) 7

(d) 3

Ans. (d)

42. The volume strength of 1.5 N H₂O₂ solutions is:

(a) 8.4L

(c) 16.8L

(b) 4.2L

(d) 5.2 L

Ans. (a)

43. When a substance is dissolved in a solvent, the vapour pressure of solvent decreases. It brings:

(a) A decrease in boiling point of the solution

(b) An increase in boiling point of the solution

(c) A decrease in freezing point of the solution

(d) An increase in freezing point of the solution

Ans. (b)

44. Acetone reacts with iodine to form iodoform in the presence of:

(a) CaCO₃

(b) NaOH

(c) KOH

(d) MgCO₃

Ans. (b)

45. The chemical formula of diammine silver (I) chloride is

(a) [Ag(NH₃)]Cl

(b) [Ag(NH₃) ₂ ]Cl

(c) [Ag(NH₃) ₂] ₂ Cl

(d) [Ag (NH₄) ₂] CI

Ans. (b)

46. When alkyl halide is heated with dry Ag20, it produces:

(a) Ester

(c) Ketone

(b) Ether

(d) Alcohol

Ans. (b)

47. The IUPAC name of the compound

(a) 2-methoxy-1-butanol

(b) 3-methoxy-1-butanol

(c) 2-methoxy-1-butanal

(d) 1, 2-methoxy-butanol

Ans. (a)

48. Which of the following has the highest first ionisation energy?

(a) Li

(b) Be

(c) B

(d) C

Ans. (d)

49. Which of the following is used widely in the manufacture of lead storage battery?

(a) Arsenic

(b) Lithium

(c) Bismuth

(d) Antimony

Ans. (d)

50. By annealing, steel:

(a) becomes soft

(b) becomes liquid

(c) becomes hard and brittle

(d) Is covered with a thin film of Fe₃O₄

Ans. (a)

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