Definitions and MCQs of Ninth class chemistry (acids, bases and salts)


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Complete and comprehensive notes of ninth class chemistry.

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Definitions and MCQs of Ninth class chemistry (acids, bases and salts)

  1. 1. Chapter 9Acids, Bases and Salts(I do not own any business but the entireworld is my own where Almighty Allah is tobe felt and Muhammad (s.a.w) to befollowed)Chemistry Def. & MCQs Dr. Sajid Ali Talpur
  2. 2.  Definitions1. Acid: -A compound having usually sour tasteand capable of neutralizing alkalis andreddening blue litmus paper, containinghydrogen that can be replaced by a metal or anyother electropositive atom to form salt, orcontaining an atom that can accept electronsfrom a base.2. Base: - A base is a substance that can accepthydrogen ions or more generally, donateselectrons pairs.3. Salt: -the ionic substance that result from theneutralization of an acid with a base.4. Ph: - A measure of the acidity or alkalinity of asolution, numerically equal to 7 for neutralsolutions, increasing with increasing alkalinityand decreasing with increasing acidity.5. Arrhenius Theory: It states that an acid can bedefined as a substance that yields hydrogen ionswhen dissolved in water. A base can be definedas a substance which yields hydroxide ionswhen dissolved in water.6. Bronsted Lowery Theory: It states that an acidis a substance having a tendency to donate oneor more protons and a base is a substancehaving a tendency to accept protons.Chemistry Def. & MCQs Dr. Sajid Ali Talpur
  3. 3. 7. Lewis Theory: It states that an acid is anyspecies (molecule or ion) which can accept apair of electrons and a base is any species(molecule or ion) which can donate a pair ofelectrons.8. Titration: -titration is the quantitativemeasurement of an analyte in solution bycompletely reaction with reagent solution.Indicators: -color showing organic compounds.OR for acid-base titrations, organic compoundsthat exhibit different colors in solution ofdifferent acidities; used to determine the point atwhich the reaction between two solutes iscomplete.9. Buffer: -any substance that prevents changes inpH is known as buffer.10. Neutralization: -when the two substances (acidand base) having opposed properties are allowedto react, salt and water are produced. Thereaction is known as neutralization.Chemistry Def. & MCQs Dr. Sajid Ali Talpur
  4. 4.  Multiple Choice Questions:1. Ascorbic acid is the other name of:a) Vitamin A b) Vitamin Bc) Vitamin C d) Vitamin D2. all are the properties of acids except:a) sour in taste b) smooth in touchc) proton donor d) electrons acceptor3. the common acid in stomach is:a) HCl b) H2SO4c) HNO3 d) H3PO44. The consumption of …… is an index to the stateof civilization and prosperity of a country:a) HCl b) H2SO4c) HNO3 d) H3PO45. the important acid for making explosivematerials and fertilizers is:a) HCl b) H2SO4c) HNO3 d) H3PO46. the souring of milk produces.a) citric acid b) lactic acidc) acetic acid d) fumaric acid7. lemon, oranges, grape fruits contain:a) citric acid b) lactic acidc) acetic acid d) fumaric acidChemistry Def. & MCQs Dr. Sajid Ali Talpur
  5. 5. 8. all are the properties of bases except:a) bitter in tasteb) aqueous solution conducts electricityc) undergo neutralization with acidsd) turn litmus paper to red.Q 9 – 14Select from the terms below:a) Arrhenius Theory b) Bronsted –loweryc) Lewis concept d) N.O.T9. Bases are proton acceptors.10. acids are sour in taste11. acids are H+ions donor12. bases turn litmus paper to blue13. ammonia is base14. bases are electron donors15. all are weak acids except:a) sulphuric acid b ) acetic acidc) formic acid d) phosphoric acid16. which one is the normal salt:a) NaCl b) NaHSO4c) KHCO3 d) Mg(OH) Cl17. which one is not double salt:a) potash alum b) chrome alumc) Mohor’s salt d) table saltChemistry Def. & MCQs Dr. Sajid Ali Talpur
  6. 6. Q18 -22Select from the terms below:a) Sodium carbonate b) backing sodac) copper sulphate d) Epsom salte) potash alum f) N.O.T18. it is a common double salt19. used as antiacid and fire extinguishers20. used as germicide, insecticide and in paint andvarnish industry21. it is used in softening of water, glass industryand as cleaning agent22. used as anticeptic and mouth wash23. water is not:a) universal solvent b) liquidc) present in urine d) amphoteric moleculee) N.O.T24. The number of moles of solute dissolved perliter of solution is:a) molarity b) molalityc) titration d) pH25. negative logarithm of hydrogen ionconcentration is:a) molarity b) molalityc) titration d) pHChemistry Def. & MCQs Dr. Sajid Ali Talpur
  7. 7. 26. it is important for an analytical chemista) molarity b) molalityc) titration d) pHQ 27 – 32Select from the terms belowa) 0 b) 5-7c) 7 d) 7.4e) 1427. it is the neutral pH28. the pH of water is :29. it is the highly acidic Ph30. the pH of urine is:31. the pH of blood is32. pH + p OH = ?33. Methyl orange produce…. Color in acidicsolutiona) red b) greenc) yellow d) pink34. a solution whose molarity or strength is knownis called standard solution:a) true b) falseChemistry Def. & MCQs Dr. Sajid Ali Talpur
  8. 8. 35. low p H of blood causes diabetes, diarrhea,vomiting.a) true b) false36. water and CO2 are produced as a result ofneutralization:a) true b) falseAnswer Key1 C 2 B 3 A4 B 5 C 6 B7 A 8 D 9 B10 D 11 A 12 D13 B 14 C 15 A16 A 17 D 18 E19 B 20 C 21 A22 E 23 E 24 C25 C 26 A 27 B28 D 29 E 30 A31 D 32 C 33 A34 A 35 B 36 BChemistry Def. & MCQs Dr. Sajid Ali Talpur