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chemistry MCQs

Practise multiple-choice questions from chemistry for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemistry Mcqs
1. What is a mixture of Potassium Nitrate Powdered Charcoal and Sulphur called?
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A. Glass

B. Paint

C. Cement

D. Gun Powder
2. Which of following metals can be displaced by all other metals from its solution ?
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A. Cu

B. Ag

C. Au

D. A

3. Purines and pyrimidines are_________________?
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A. Enzymes

B. Carbohydrates

C. Nitrogenous bases

D. Lipids

4. Isomerism which is present only in alkene is__________________?
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A. structural isomerism

B. metamerism

C. cis-trans isomerism

D. both b and c

5. Stronger is the oxidizing agent greater is the___________________?
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A. Oxidation potential

B. e.m.f of cell

C. standard reduction potential

D. Redox potential

6. A safe and more reliable method for drying the crystal is__________________?
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A. Vacuum desiccator

B. folds of filter paper

C. oven

D. Hot air currents

7. Which of the elements do not fall in stair case of the modern periodic table__________________?
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A. Si

B. None of the above

C. As

D. Te

8. The hardest of the following solids is__________________?
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A. graphite

B. diamond

C. magnesium

D. sodium

9. Which of the following solution has the highest boiling point ?
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A. All have same boiling point

B. 18.0 % glucose solution

C. 6.0 % urea solution

D. 5.85% NaCl Solution
10. The inhaled breath of diabetics patient contain acetone. A medical student wishes to test for diabetes by asking patient to bubble their breath through a reagent ?
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A. aqueous NaOH

B. Fehling solution

C. aqueous bromine

D. alkaline aquenous iodine
11. The properties of an element mosly corresponds to that isotope which has greater_________________?
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A. all of the above

B. Mass number

C. Atomic mass

D. Relative abundance
12. When cationic molecular ions are allowed to pass through strong magnetic field in mass spectrometer which of the following ions is fallen__________________?
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A. lighter

B. are collected at same time

C. heavier

D. intermediate

13. Which of the following are isoelectronic species ?
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A. C1- Br- I

B. Li+ Na+ K+

C. F- Ne Na+

D. H+ H H-

14. The radioactive isotope of hydrogen is called___________?
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A. protium

B. deuterium

C. tritium

D. ortho-hydrogen

15. Chemical properties of first member of homologous series with respect to other members are_________________?
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A. same

B. depends upon number of C atoms

C. different

D. depends upon number of H atoms

16. Electron was discovered by?
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A. Yuri Gagarin

B. James Maxwell

C. Michael Faraday

D. J.J Thomson
17. In which of the following type of reactions energy of reactant is greater than energy of product________________?
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A. endothermic

B. unpredictable

C. same

D. exothermic
18. Which of the following is an amide________________?
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A. R-NH2

B. C6H5NH2

C. RCONH2

D. R NH R

19. When aquious bromine is added to aqueous phenol a creamy white ppt is obtained. What does this reaction show ?
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A. a hydroxy group makes the benzene ring more susceptible to electrophilic attack

B. 2-bromophenol is insoluble in water

C. phenol is unsaturated

D. acid-base reaction

20. Which one of the following looks odd__________________?
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A. KMnO4

B. H2SO4

C. H2S

D. K2CrO4

21. A method of separation of components from its solution using Distribution law is ___________________?
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A. Solvent extraction

B. Distillation

C. Sublimation

D. Crystallisation

22. For which system does the equilibrium constant Kc has unit of (concentration)-1__________________?
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A. N2+3H2 2NH3

B. H2+I2 2HI

C. 2NO2 N2H4

D. PCI5 PCI3+CI2

23. Which of the following methods is used to estimate hydrogen in an organic compound ?
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A. All of the above methods are for different purposes

B. Combustion method

C. Dumas method

D. Kjeldahls method

24. Which of the following points are important in connection with equilibrium constant ?
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A. Kc is unaffected by change in concentration of reactants or products

B. All of the above

C. Kc indicates the extent of reaction but not about the rate of reaction.

D. Kc is constant at given temperature

25. Which of the following terms is used for the mass of chlorine 35.5 ?
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A. relative atomic mass

B. mass number

C. atomic weight

D. relative isotopic mass

26. Industrial materials thermal power stations are coated with__________________?
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A. Epoxy paints

B. Polyester resins

C. polyamide resins

D. Polyvinyl chloride

27. In solids the temperature is the measure of__________________?
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A. Vibrational kinetic energy

B. Average kinetic energy of molecules

C. None of the above

D. Translational kinetic energy

28. Which of the following elements has greater 1st ionization energy__________________?
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A. N

B. O

C. B

D. C

29. A solution has pH = 0 its H+ ion concentration is__________________?
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A. 1 x 10-1

B. 1 x 10-7

C. 1 x 10-14

D. 1
30. Bohrs model is contradicted by__________________?
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A. Plancks theory

B. Heisenbergs uncertainty principle

C. Dual nature of matter

D. All of these

31. Which of the following element doesnot show allotropy_________________?
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A. Arsenic

B. Nitrogen

C. Carbon

D. Sulphur

32. Which of the solid does not contain covalent bond__________________?
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A. copper

B. diamond

C. ice

D. graphite

33. 1 mole of electron has mass in microgram_________________?
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A. 1.673 x 10-3

B. 1.84 x 10-4

C. 1.008 x 10-3

D. 5.5 x 10-4
34. Which of the following properties prove that cathode rays are material in nature_________________?
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A. all of the above

B. they are negatively charged

C. they cast shadow

D. they possess momentum
35. For industrial preparation of CH3CHO catalytic promoter is_________________?
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A. CuCl2

B. Cu2Cl2

C. PdCl2

D. PbCl2

36. The process of fermentation involves all the enzymes except__________________?
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A. Invertase

B. Sucrase

C. Zymase

D. Diastase

37. The common name of propane -1 3-dioic acid is____________________?
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A. Succinic acid

B. Fumaric acid

C. Malonic acid

D. Oxalic acid

38. Which of the following elements conduct electricity and also melts below 100C ?
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A. Sulphur

B. Aluminium

C. Carbon

D. Sodium
39. The metallic sound produced by engine due to the pre-ignition of fuel is called _______________?
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A. a and c

B. knocking

C. cracking

D. reforming

40. What is maximum number of electrons in an orbital with m (magnetic quantum number) = 3 ?
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A. 6

B. 4

C. 2

D. 3

41. Which of the following is pseudo solid_____________________?
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A. CaF2

B. Diamond

C. NaCl

D. Glass
42. Which of the following solids show anisotropy___________________?
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A. Plastic

B. None of the above

C. Rubber

D. Glass

43. Which of the following can be used in laptops ?
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A. Fuel cell

B. Silver oxide battery

C. Nickel cadmium cell

D. Lead accumulator

44. Equal masses of methane and oxygen are mixed in empty container at 250?(C) The fraction of total pressure exerted by oxygen is___________________?
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A. two / three

B. one / seventeen

C. one / three

D. sixteen / seventeen

45. Covalent network crystals have_____________?
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A. higher melting point then molecular crystals

B. discrete molecules linked by Van der waals forces

C. hydrogen bonding

D. lower melting point then molecular crystals

46. Empirical formula of chloroform is____________________?
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A. CHCL3

B. CH3C1

C. CC14

D. CH2 C12

47. Dempsters mass spectrometer has number of zones / parts_________________?
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A. 4

B. 5

C. 2

D. 3

48. The balanced chemical equation for the reaction which occurs when Be is added to water is____________?
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A. no reaction

B. Be+H2O?Be (OH)2+H2

C. Be+H2O?[Be (OH)4]+2+H2

D. Be+2H2O?Be (OH)2+H2

49. When 0.5 mole of phosphoric acid is dissolved in aqueous solution how many moles of -ve and +ve ions are collected altogether ?
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A. 1

B. 0.5

C. 1.5

D. 2
50. Atomic radius can be determined by_________________?
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A. Electron microscope

B. X ray diffraction

C. Optical microscope

D. Spectrophotometer