Quiz on Chemistry for 12th Students

Post: Quiz on Chemistry for 12th Students. Multiple choice objective questions on chemistry. Topics: Hydrogen bond, hydrogen bonding, carbohydrates, vitamin, protein, olefin, acids, fat, enzymes, Brownian motion, Tyndall effect, periodic table, Bohr model, macro and micronutrients, IUPAC system, catalyst, chromatography, others.

Also read: Quiz on botany for 12th

Important quiz on chemistry

Question 01. Which type of bond is dipole-dipole interactions?

(a). Primary bond.
(b). Weak bond.
(c). Secondary bond.
(d). All of the above.

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Question 02. What will be the proportional formula of a compound which has 48% C, 4% H, and 48% O2?

(a). C4H4O.
(b). C4H4O2.
(c). C4H4O3.
(d). C4H4O4.

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Question 03. Identify olefin?

(a). C2H6.
(b). C4H4.
(c). C2H2.
(d). CH3OH.

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Question 04. Which a blood coagulation vitamin?

(a). Vitamin A.
(b). Vitamin B.
(c). Vitamin E.
(d). Vitamin K.

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Question 05. Where is Brownian motion observed?

(a). Liquid medium.
(b). Gaseous medium.
(c). Both a and b.
(d). Soil media.

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Question 06. Consider about Brownian mostion.

  1. It is the random motion of particles.
  2. This motion is named after Robert hook.
  3. Ion is a Brownian particle.
  4. Protein doesn’t behave as a Brownian particle.

(a). Only 1 and 3 are true.
(b). Only 2 and 4 are true.
(c). 3 is not true.
(d). All are true.

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Question 07. What is Tyndall effect?

(a). Sound scattering by particles.
(b). Light effect by particles.
(c). Both a and b.
(d). Motion effect by particles.

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Question 08. In Tyndall effect, which will scatter more?

(a). Red light.
(b). Violet light.
(c). Indigo light.
(d). Blue light.

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Question 09. In hydrogen bond which is the most frequent donor and acceptor atom?

(a). Nitrogen second-row element.
(b). Oxygen first row element.
(c). Fluorine first row element.
(d). All of the above.

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MCQ on chemistry

Question 10. Consider about hydrogen bonding.

  1. A H atom attached to a relatively electronegative atom is the H bond acceptor.
  2. C-H bonds can also participate in hydrogen bonding when the carbon atom is bound to electropostive substituents.
  3. In the H bond donor, center of H is protic.
  4. The donor is a Lewis base.
  5. In H···Y system dots represent the hydrogen bond.

Which option includes true statements.

(a). Only 1 and 2 are true.
(b). Only 1, 3 and 5 are true.
(c). Only 3, 4, and 5 are true.
(d). None of the above.

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Question 11. What is period in a periodic table?

(a). Four rectangular areas.
(b). Columns of the table.
(c). Rows of the table.
(d). None of the above.

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Question 12. In a periodic table, non-metallic characters increase in which direction?

(a). Form right to left across a period.
(b). From up to down across a group.
(c). From left to right across a group.
(d). None of the above.

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Question 13. Which one is the 112th element in a periodic table?

(a). Rg.
(b). Mc.
(c). Nh.
(d). Cn.

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Question 14. In a periodic table, which one belongs to transition material?

(a). Mn.
(b). Ni.
(c). Fe.
(d). All of the above.

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Question 15. Which one is the last element of a periodic table?

(a). Og.
(b). Ts.
(c). Lv
(d). Lr.

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Question 16. Which one of the following is ketohexose?

(a). Glucose.
(b). Sucrose.
(c). Starch.
(d). Fructose.

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Question 17. Which is known as ascorbic acid?

(a). Vitamin A.
(b). Vitamin C.
(c). Vitamin D.
(d). Vitamin B.

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Multiple choice questions

Question 18. What is fat?

(a). Fat is easter of mallic.
(b). Fat is easter of fatty acid.
(c). Fat is easter of amino acid.
(d). None of the above.

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Question 19. How is fat extracted?

(a). By using hexane solvent.
(b). By supercritical carbon dioxide.
(c). Both a and b.
(d). None of the above.

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Question 20. Orotidine 5′-phosphate decarboxylase is involved in the biosynthesis of which one of the following?

(a). Pyrimidine.
(b). Pyrethrum.
(c). Pyruvate.
(d). All of the above.

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Question 21. Which is a less common amino acid?

(a). Cysteine.
(b). Selenocysteine.
(c). Methionine.
(d). None of the above.

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Question 22. What is an enzyme?

(a). Protein.
(b). Mineral.
(c). Oil.
(d). Fatty acid.

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Question 23. What is the base of the Bohr model?

(a). Electrolytic dissociation theory.
(b). Law of mass ratio action.
(c). Dalton’s atom theory.
(d). Quantum theory.

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Question 24. Who discovered radioactive for the first time?

(a). Henry Becquerel.
(b). Madame Curie.
(c). Niels Bohr.
(d). J. J. Thomson.

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Question 25. The formula of an element’s phosphate is MHPO4. What will be the formula of its chloride?

(a). MCI.
(b). MCI2.
(c). MCI3.
(d). M2CI3.

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Online mock test biochemistry

Question 26. Why is acetic acid a weak acid?

(a). It is unstable.
(b). It is an organic compound.
(c). Its ionization is low.
(d). It is a basic acid.

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Question 27. Which one is a micronutrient?

(a). Nitrogen.
(b). Phosphorus.
(c). Potash.
(d). Zinc.

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Question 28. The molecular mass of KMnO4 is M. What will be its equivalent weight in acidic medium?

(a). M.
(b). M/2.
(c). M/3.
(d). M/5.

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Question 29. Of which compound is ethylene a member?

(a). Paraffin.
(b). Olefin.
(c). Paraffin.
(d). None of the above.

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Question 30. Which is abundant in soil surface?

(a). Al2O3.
(b). SiO2.
(c). MgO.
(d). CaO.

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Question 31. In which of the following is hydrogen bond absent?

(a). Ammonia.
(b). Hydrogen.
(c). Alcohol.
(d). Ethylene.

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Question 32. What will be the result of acidic solution in water?

(a). Ferric chloride.
(b). Ammonium acetate.
(c). Sodium chloride.
(d). Sodium acetate.

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Question 33. Between how many substrates the oxidoreductases catalyse oxido-reductions?

(a). Two substrates.
(b). Three substrates.
(c). Four substrates.
(d). Five substrates.

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Question 34. Hydrolases catalyse hydrolysis of which one of the following?

(a). Ester.
(b). Peptide.
(c). Glycosidic bonds.
(d). All of the above.

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Objective questions for 12th students

Question 35. Conversion of  malic acid to fumaric acid by fumarase is the example of which one of the following?

(a). Isomerases.
(b). Lyases.
(c). Ligases.
(d). Transferases.

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Question 36. What is the pH of blood?

(a). 5.2.
(b). 6.3.
(c). 7.4.
(d). 8.5.

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Question 37. Which one is the IUPAC name of CH3CH2COCl?

(a). Propanoyl chloride.
(b). Ethenoil chloride.
(c). Acetyl chloride.
(d). Chloro ethane.

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Question 38. Which one is a chemical?

(a). NH2CONH2.
(b). (NH4)2SO4.
(c). Ca(H2PO4)2.
(d). HNO2.

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Question 39. Which catalyst is used in the hardening of oils?

(a). Co.
(b). Fe.
(c). Cu.
(d). Ni.

See answer

Question 40. What is chromatography?

(a). Separation of mixture into components.
(b). Identification of components.
(c). Study of microelememts.
(d). Study of elemental colours.

See answer


01: Gabuda S.P., and Lundin, A.G.(1969). Diffusion of Water Molecules in Hydrates and NMR Spectra. Url: http:/www.jetp.ac.ru/cgi-bin/dn/e_028_03_0555.pdf

02: Brian Burrell (1998). Merriam-Webster’s Guide to Everyday Math: A Home and Business Reference. ISBN 9780877796213, p. 85–101.

03: Olefin: Chemical compound. The Editors of Encyclopaedia Britannica. URL: https://www.britannica.com. Reference date: January 07, 2022.

04: Science Direct. Vitamin K and its role in blood coagulation. URL: https://www.sciencedirect.com › Vitamin K and its role in blood coagulation. Reference date: January 07, 2022.

05 and 06: Feynman R. (1964). The Brownian Movement. The Feynman Lectures of Physics, Volume 01. p. 41.

07 and 08: Tyndall effect. URL: https://chem.libretexts.org/Bookshelves. Physical and Theoretical Chemistry Textbook Maps. Supplemental Modules (Physical and Theoretical Chemistry). Physical Properties of Matter. Solutions and Mixtures Colloid Tyndall Effect.

09 and 10: Jeffrey G. A.(1997). An introduction to hydrogen bonding. Oxford university press, New York, United States of America. ISBN 0195095499.

11 and 15: Periodic table of elements. https://pubchem.ncbi.nlm.nih.gov/periodic-table/.

21: Medline plus. Amino acid. URL: https://medlineplus.gov/ency/article/002222.htm.

22: Clevel and clinic. What are enzymes? Pancreas, digestion and liver functions. URL: https://my.clevelandclinic.org/health/articles/21532-enzymes.

24: Martin B.R. (2011). Nuclear and particle physics: An introduction (second edition). p. 240. 

40.1: Bernard F. (2003). Handbook of Thin-Layer Chromatography. Marcel Dekker Incorporation. 

40.2: Chromatography. URL: https://www.etymonline.com/word/chromatography.

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