This quiz works best with JavaScript enabled. Home > Cbse > Class 7 > Science > Salts > Class 7 Science Chapter 4 Salts – Quiz 12 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Salts Quiz 12 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. SOAP IS MADE UP OF? A) POTASSIUM HYDROXIDE. B) SODIUM HYDROXIDE. C) BOTH ' A' AND 'B'. D) NONE. Show Answer Correct Answer: C) BOTH ' A' AND 'B'. 2. Ant's sting contain ..... Acid A) Formic. B) Ascorbic. C) Carbonic. D) Hydrochloric. Show Answer Correct Answer: A) Formic. 3. What is another name of magnesium sulphate A) Epsom Salt. B) Washing soda. C) Blue vitriol. D) Table salt. Show Answer Correct Answer: A) Epsom Salt. 4. A solution has turned the colour of red litmus paper to blue. The pH of the solution is approximately: A) 10. B) 2. C) 7. D) 5. Show Answer Correct Answer: A) 10. 5. Bases are ..... in taste A) Bitter. B) Sweet. C) Chilly. D) Sour. Show Answer Correct Answer: A) Bitter. 6. In dilute acid the Concentration of water is- A) Less. B) More. C) Equally. D) None of the above. Show Answer Correct Answer: B) More. 7. Which method is used to prepare barium sulfate? A) Add excess solid reactant to acid. B) Titration. C) Precipitation. D) None of the above. Show Answer Correct Answer: C) Precipitation. 8. Chemical formula of ammonium hydroxide A) NH4OH. B) CA(OH2). C) All the above. D) None of the above. Show Answer Correct Answer: A) NH4OH. 9. To relieve indigestion, we take an antacid such as ..... , which contains magnesium hydroxide. A) Milk of hydroxide. B) Milk of magnesia. C) Magnesium hydroxide. D) Calcium hydroxide. Show Answer Correct Answer: B) Milk of magnesia. 10. Which of the following reactions form only salt and hydrogen gas? A) Zinc carbonate and hydrochloric acid. B) Magnesium and sulphuric acid. C) Copper(II) oxide and nitric acid. D) Calcium hydroxide and hydrochloric acid. Show Answer Correct Answer: B) Magnesium and sulphuric acid. 11. Give the name of an ion PO4 $^{3-}$: A) Metaphosphate. B) Diphosphate. C) Phosphate. D) None of the above. Show Answer Correct Answer: C) Phosphate. 12. What is a strong base? A) Solution producing a low concentration of hydrogen ions. B) Solution producing high concentration of hydrogen ions(H+). C) Solution producing high concentration of hydroxyl ions (OH-). D) Solution producing high concentration of hydroxyl ions (OH-). Show Answer Correct Answer: C) Solution producing high concentration of hydroxyl ions (OH-). 13. Substances which taste bitter and feel soapy on touching are known as A) Bases. B) Salts. C) Acids. D) Neutral. Show Answer Correct Answer: A) Bases. 14. Which form of Turmeric is used as an indicator? A) No change. B) Paste. C) Liquid. D) Strips. Show Answer Correct Answer: B) Paste. 15. Bases are soapy to touch. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 16. The solubility of calcium sulfate will increase in a(n) ..... A) Acidic solution. B) Basic solution. C) Neutral solution. D) Potassium sulfate solution. Show Answer Correct Answer: A) Acidic solution. 17. Neutralization reaction can be compared to a battle between two powerful forces. In this scenario, what does neutralization reaction mean? A) Formation of a cation and anion. B) Formation of salt and water. C) Increase of H$_{3}$O$^{+}$ ions. D) Increase of OH$^{-}$ ion. Show Answer Correct Answer: B) Formation of salt and water. 18. It is known that the following solutions:1) Na $ _ {2} $ s2) kcn3) nh $ _ {4} $ cl4) al $ _ {2} $ (so $ _ {4} $) $ _ {3} $$ _ {5)} $ ba (no A) 1 and 2. B) 1 and 3. C) 2 and 5. D) 3 and 4. E) 4 and 5. Show Answer Correct Answer: A) 1 and 2. 19. What is the range of the pH scale for bases? A) 1 to 7. B) 7 to 14. C) 0 to 7. D) 14 to 0. Show Answer Correct Answer: B) 7 to 14. 20. What is the formula for Potassium Sulphate? A) Hiker. B) K2so4. C) Patch. D) K2S. Show Answer Correct Answer: B) K2so4. 21. State whether the following compound is soluble or insoluble. Lead(II) iodide PbI$_{2}$ A) Soluble. B) Insoluble. C) All the above. D) None of the above. Show Answer Correct Answer: B) Insoluble. 22. Which type of salt the following salt are classiffied as?"K$_{2}$SO$_{4}$" A) Neutral salt. B) Acidic salt. C) Basic salt. D) None of the above. Show Answer Correct Answer: A) Neutral salt. 23. Ammonium Carbonate, (NH$_{4}$)$_{2}$CO$_{3}$ A) Soluble Salt. B) Insoluble Salt. C) All the above. D) None of the above. Show Answer Correct Answer: A) Soluble Salt. 24. The effect of formic acid cannot be neutralised by rubbing ..... A) Moist baking soda. B) Soda water. C) Calamine solution. D) None of the above. Show Answer Correct Answer: B) Soda water. 25. Copper sulphate crystal having five molecules of water in each copper sulphate molecule is written as A) $ AGNO_3 $. B) $CaCO_3$. C) $CuSO_4.5H_2O$. D) $ 10 h_2o $. Show Answer Correct Answer: C) $CuSO_4.5H_2O$. 26. Which one of the given is incorrect? A) Acids turns blue litmus paper red. B) Aqueous solutions of acids conduct electricity. C) Acids react with certain metals to form hydrogen gas. D) None of the above. Show Answer Correct Answer: D) None of the above. 27. On the pH scale is ..... A) Increasingly acidic. B) Increasingly basic. C) Neutral. D) None of the above. Show Answer Correct Answer: B) Increasingly basic. 28. Which of the following is an insoluble salt? A) Lead(II) sulfate. B) Calcium chloride. C) Ammonium carbonate. D) Lead(II) nitrate. Show Answer Correct Answer: A) Lead(II) sulfate. 29. Crystallisation is used to separate ..... from a liquid. A) Undissolved solid. B) Undissolved liquid. C) Dissolved solid. D) Dissolved liquid. Show Answer Correct Answer: C) Dissolved solid. 30. Which of the following salts can be prepared by using double decomposition method? A) Sodium carbonate. B) Lead (II) nitrate. C) Silver chloride. D) Barium nitrate. Show Answer Correct Answer: C) Silver chloride. 31. What is added to phenolphthalein to make it colourless? A) Base. B) Acid. C) Both. D) Salt. Show Answer Correct Answer: B) Acid. 32. Which of the following ions is in white precipitate and insoluble in excess sodium hydroxide solution? A) Zn$^{2+}$. B) Mg$^{2+}$. C) Pb$^{2+}$. D) Al$^{3+}$. Show Answer Correct Answer: B) Mg$^{2+}$. 33. A substance, P, dissolves in dilute hydrochloric acid to produce a gas which turn lime water milky. When aqueous sodium hydroxide is added, a brown precipitate is formed. What is probably P? A) Iron (III) carbonate. B) Zinc carbonate. C) Lead (II) carbonate. D) Magnesium carbonate. Show Answer Correct Answer: A) Iron (III) carbonate. 34. Tooth decay is formed by the presence of base. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 35. Bases are used as window cleaners. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 36. THE ACID PRESENT IN ANT STING IS? A) HYDROCHLORIC ACID. B) ACETIC ACID. C) FORMIC ACID. D) TARTARIC ACID. Show Answer Correct Answer: C) FORMIC ACID. 37. Strong acids react with weak base to form A) Basic salt. B) Neutral salt. C) Acidic salt. D) None of the above. Show Answer Correct Answer: C) Acidic salt. 38. What does PH value "7" indicates? A) Strong Acidic Solution. B) Acidic Solution. C) Neutral Solution. D) Strong Basic Solution. E) Basic Solution. Show Answer Correct Answer: C) Neutral Solution. 39. What is the chemical formulae for Nitric acid? A) H$_{2}$SO$_{4}$. B) HNO$_{3}$. C) HCl. D) None of the above. Show Answer Correct Answer: B) HNO$_{3}$. 40. A substance with a ph of lower than 7 is a A) Acid. B) Threaten and. C) Base. D) Salt. Show Answer Correct Answer: A) Acid. 41. Which of the following shows the correct dissolution reaction for BaCl$_{2}$ as related to K$_{sp}$? A) BaCl$_{2}$(s) $\rightarrow$ Ba $^{2+}$(aq) + Cl$_{2}$$^{-}$(aq). B) BadCl$_{2}$(s) $\rightarrow$ F $^{2+}$(aq) + 2Cl$^{-}$(aq). C) Bad $^{2+}$(aq) + 2Cl$^{-}$(aq) $\rightarrow$ BaCl$_{2}$(s). D) BadCl$_{2}$(aq) $\rightarrow$ F $^{2+}$(aq) + 2Cl$^{-}$(aq). Show Answer Correct Answer: B) BadCl$_{2}$(s) $\rightarrow$ F $^{2+}$(aq) + 2Cl$^{-}$(aq). 42. Slaked lime and quick line respectively is A) Calcium Hydroxide and Calcium oxide. B) Calcium oxide AND Calcium Hydroxide. C) Both. D) None. Show Answer Correct Answer: A) Calcium Hydroxide and Calcium oxide. 43. State whether the following compound is soluble or insoluble. Potassium bromide KBr A) Soluble. B) Insoluble. C) All the above. D) None of the above. Show Answer Correct Answer: A) Soluble. 44. Acid + Carbonate $\rightarrow$ A) Salt + water. B) Salt + water + carbon dioxide. C) Salt + carbon dioxide. D) Salt + hydrogen. Show Answer Correct Answer: B) Salt + water + carbon dioxide. 45. What is the oxidation number of a Nitrogen in the compound HNO2? A) +3. B) +2. C) +5. D) None of the above. Show Answer Correct Answer: A) +3. 46. Which two chemicals could you react to make only potassium chloride and water? A) Potassium and hydrochloric acid. B) Potassium hydroxide and hydrochloric acid. C) Potassium oxide and sulfuric acid. D) Potassium and sulfuric acid. Show Answer Correct Answer: B) Potassium hydroxide and hydrochloric acid. 47. Copper sulphate is also known as A) Oil of vitriol. B) Blue vitriol. C) All the above. D) None of the above. Show Answer Correct Answer: B) Blue vitriol. 48. Metal + Steam yields ..... A) Metal Oxide + Hydrogen. B) Metal Oxide. C) Metal Hydroxide + Hydrogen. D) A + B. Show Answer Correct Answer: C) Metal Hydroxide + Hydrogen. 49. Sodium hydroxide when exposed to the atmosphere at ordinary temperature, absorb moisture from atmosphere to become moist and ultimately dissolve in water to form a solution. What property is being exhibited by sodium hydroxide A) Diiquescence. B) Hygroscopic. C) Efflorescence. D) Dehydration. Show Answer Correct Answer: A) Diiquescence. 50. A student wants to make a basic salt. which of the following pairs of acid and base should he use. A) H$_{2}$SO$_{4}$ + K0H. B) HCl + NaOH. C) HCl + NH$_{4}$OH. D) H $ _ {2} $ Co $ _ {3} $ noe. Show Answer Correct Answer: D) H $ _ {2} $ Co $ _ {3} $ noe. 51. When a solution is basic phenolphthalein gives a ..... colour. A) Pink. B) Blue. C) Yellow. D) Red. Show Answer Correct Answer: A) Pink. 52. What is the correctly written chemical formula for the ionic compound, strontium oxide? A) SrO. B) SrO$_{2}$. C) Sr $ _ {2} $ o $ _ {2} $. D) Sr $ _ {2} $ o. Show Answer Correct Answer: A) SrO. 53. Ammonium Hydroxide is present in: A) Ant's Sting. B) Window Cleaner. C) Lime water. D) Soap. Show Answer Correct Answer: B) Window Cleaner. 54. State a reason why filtration is carried out during the preparation of Copper (II) sulphate when copper (II) oxide is added to dilute Sulphuric (VI)? A) To speed up the rate of reaction. B) To remove unreacted Copper (II) oxide. C) To dry Copper (II) Sulphate. D) To remove water. Show Answer Correct Answer: B) To remove unreacted Copper (II) oxide. 55. Substance which indicate if a substance is acid or basic is called a ..... A) China rose petals. B) Indicators. C) Turmeric. D) All of these. Show Answer Correct Answer: B) Indicators. 56. WHAT ARE INDICATORS? A) Indicators are the substances which when added in a solution show a change in colour, indicating whether it is an acidic or basic solution. B) Indicators are sour in taste. C) Indicators are bitter in taste. D) None of the above. Show Answer Correct Answer: A) Indicators are the substances which when added in a solution show a change in colour, indicating whether it is an acidic or basic solution. 57. Read the following and answer the question. A factory releases all it's waste, that is, harmful acids into bodies of water.The waste needs to be released immediately. But, there are organisms living inside the water too. Which one of these is the correct solution? A) Clear out all living organisms inside the body of water. Then, release the factory waste. B) Release all the waste immediately. C) Add Bases to neutralise the waste. D) None of the above. Show Answer Correct Answer: C) Add Bases to neutralise the waste. 58. Which is not a property of acids? A) These are sour to taste. B) Acids do not change the colour of turmeric indicator. C) Acids turn blue litmus red. D) With china rose indicator, these give dark pink colour. E) Acids turn red litmus blue. Show Answer Correct Answer: E) Acids turn red litmus blue. 59. If K < Q, which part of the reaction will speed up? A) Dissolution. B) Precipitation. C) None. D) None of the above. Show Answer Correct Answer: B) Precipitation. 60. What is the test for Hydrogen gas? A) Squeaky pop. B) Lime water turning cloudy. C) Add pH paper. D) None of the above. Show Answer Correct Answer: A) Squeaky pop. ← PreviousNext →Related QuizzesScience QuizzesClass 7 QuizzesClass 7 Science Chapter 4 Salts Quiz 1Class 7 Science Chapter 4 Salts Quiz 2Class 7 Science Chapter 4 Salts Quiz 3Class 7 Science Chapter 4 Salts Quiz 4Class 7 Science Chapter 4 Salts Quiz 5Class 7 Science Chapter 4 Salts Quiz 6Class 7 Science Chapter 4 Salts Quiz 7Class 7 Science Chapter 4 Salts Quiz 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books