This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Salts – Quiz 30 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Salts Quiz 30 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. 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. 2. 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. 3. 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. 4. What is the range of the pH scale for bases? A) 1 to 7. B) 0 to 7. C) 7 to 14. D) 14 to 0. Show Answer Correct Answer: C) 7 to 14. 5. What is the formula for Potassium Sulphate? A) Hiker. B) Patch. C) K2S. D) K2so4. Show Answer Correct Answer: D) K2so4. 6. Rain water have pH A) =7. B) <7. C) >7. D) ~7. Show Answer Correct Answer: B) <7. 7. 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. 8. 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. 9. 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. 10. 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. 11. Copper sulphate crystal having five molecules of water in each copper sulphate molecule is written as A) $CuSO_4.5H_2O$. B) $CaCO_3$. C) $ AGNO_3 $. D) $ 10 h_2o $. Show Answer Correct Answer: A) $CuSO_4.5H_2O$. 12. 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. 13. Bases A) Formed from joining positive and negative ions. B) Increase OH ions. C) Forms a salt and water. D) Increases H2O ions. Show Answer Correct Answer: B) Increase OH ions. 14. 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. 15. Which of the following is an insoluble salt? A) Lead(II) sulfate. B) Lead(II) nitrate. C) Calcium chloride. D) Ammonium carbonate. Show Answer Correct Answer: A) Lead(II) sulfate. 16. Crystallisation is used to separate ..... from a liquid. A) Undissolved liquid. B) Dissolved liquid. C) Undissolved solid. D) Dissolved solid. Show Answer Correct Answer: D) Dissolved solid. 17. Which of the following salts can be prepared by using double decomposition method? A) Silver chloride. B) Barium nitrate. C) Sodium carbonate. D) Lead (II) nitrate. Show Answer Correct Answer: A) Silver chloride. 18. What is added to phenolphthalein to make it colourless? A) Base. B) Acid. C) Both. D) Salt. Show Answer Correct Answer: B) Acid. 19. Which of the following ions is in white precipitate and insoluble in excess sodium hydroxide solution? A) Al$^{3+}$. B) Pb$^{2+}$. C) Zn$^{2+}$. D) Mg$^{2+}$. Show Answer Correct Answer: D) Mg$^{2+}$. 20. 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) Magnesium carbonate. D) Lead (II) carbonate. Show Answer Correct Answer: A) Iron (III) carbonate. 21. 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. 22. 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. 23. THE ACID PRESENT IN ANT STING IS? A) TARTARIC ACID. B) HYDROCHLORIC ACID. C) FORMIC ACID. D) ACETIC ACID. Show Answer Correct Answer: C) FORMIC ACID. 24. 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. 25. What does PH value "7" indicates? A) Neutral Solution. B) Acidic Solution. C) Basic Solution. D) Strong Acidic Solution. E) Strong Basic Solution. Show Answer Correct Answer: A) Neutral Solution. ← PreviousNext →Related 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 8Class 7 Science Chapter 4 Salts Quiz 9Class 7 Science Chapter 4 Salts Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books