This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Bases – Quiz 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Bases Quiz 3 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Neutralization occurs when these react with acids forming a salt and water A) Acid. B) Base. C) Neutral. D) None of the above. Show Answer Correct Answer: B) Base. 2. Which is NOT true about indicators? A) They each have a certain pH where they change color. B) They come in a variety of colors. C) They are useful in titrations. D) They neutralize acids and bases. Show Answer Correct Answer: D) They neutralize acids and bases. 3. What does the Latin root mal mean? A) Around. B) Bad. C) Against. D) To send. Show Answer Correct Answer: B) Bad. 4. Arhenius:Any substance that in aqueous solution dissociates with hydrogen formation H $^{+} $ (protons) A) Acid. B) Base. C) Neutral. D) Animal. Show Answer Correct Answer: A) Acid. 5. Which one of these is a salt? A) Sulphuric acid. B) Water. C) Sodium Chloride. D) Sodium hydroxide. Show Answer Correct Answer: C) Sodium Chloride. 6. According to which theory is a base a substance which produces OH-ions in water? A) Arrhenius. B) Bronsted-Lowry. C) Lewis. D) None of the above. Show Answer Correct Answer: A) Arrhenius. 7. What is being donated/accepted between conjugate acid-base pairs? A) A hydrogen (H+) ion. B) A hydroxide (OH-) ion. C) Water. D) A neutron. Show Answer Correct Answer: A) A hydrogen (H+) ion. 8. Acid:substance that can accept electrons in the formation of bonds. A) TEORIA DE BRONSTED-LOWRY. B) TEORIA THE LEWIS. C) Acid-base neutralization. D) None of the above. Show Answer Correct Answer: B) TEORIA THE LEWIS. 9. Which of these formulas represents an acid? A) Cacl $ _ {2} $. B) H$_{2}$SO$_{4}$. C) Any otheruce. D) Highh. Show Answer Correct Answer: B) H$_{2}$SO$_{4}$. 10. Identify the cardinality of the statement:in an art contest, each participating artist has created a work and in turn each work has been created by a single artist. A) Uno a Uno. B) One to many. C) Many to many. D) None of the above. Show Answer Correct Answer: A) Uno a Uno. 11. A conductor of electricity A) Base. B) Acid. C) Both. D) Neither. Show Answer Correct Answer: C) Both. 12. Which of the following describes a dilute alkali? A) An alkali with a high amount of alkali dissolved in water. B) An alkali with a low amount of alkali dissolved in water. C) An alkali that produces a large number of hydroxyl ions. D) An alkali that is highly soluble in water. Show Answer Correct Answer: B) An alkali with a low amount of alkali dissolved in water. 13. Nitric acid produces ..... salts A) Chloride. B) Nitrate. C) Sulphate. D) Carbonate. Show Answer Correct Answer: B) Nitrate. 14. Consider the following statements:(a)Both acids and bases change colour of all indicators.(b) If an indicator gives a colour change with an acid, it does not give a change with a base.(c) If an indicator changes colour with a base, it does not change colour with an acid.(d) Change of colour in an acid and a base depends on the type of the indicator. Which of these statements are correct? A) All four. B) A and d. C) B, c and d. D) Only d. Show Answer Correct Answer: B) A and d. 15. The strength of an acid refers to its ability: A) To dissociate, or break down into its cation (positively charged ion) and anion (negatively charged ion), in water. B) To dissociate, or break down into its cation (positively charged ion), in water. C) To dissociate, or break down into its anion (negatively charged ion), in water. D) To not dissociate into its cation (positively charged ion) and anion (negatively charged ion), in water. Show Answer Correct Answer: A) To dissociate, or break down into its cation (positively charged ion) and anion (negatively charged ion), in water. 16. Which of the following is true about the dilution of alkalis? A) Alkalis cannot be diluted with water. B) Dilution of alkalis follows a similar process to the dilution of acids. C) Only concentrated alkalis can be diluted. D) Diluting alkalis is not recommended as it is a dangerous process. Show Answer Correct Answer: B) Dilution of alkalis follows a similar process to the dilution of acids. 17. A substance that tastes bitter A) Base. B) Acid. C) Neutral. D) None of the above. Show Answer Correct Answer: A) Base. 18. Which Greek base means 'light'? A) Photo. B) Phon. C) Hydr. D) Graph. Show Answer Correct Answer: A) Photo. 19. Assertion (A):The substance which shows the nature of a solution as acidic or basic with the change in colour are called indicators. Reason (R):Red litmus turns blue in a solution containing vitamin 'C'. A) Both A and R are true and R is the correct explanation of A. B) Both A and R are true but R is not the correct explanation of A. C) A is true but R is false. D) A is false but R is true. Show Answer Correct Answer: C) A is true but R is false. 20. Name the Product, when a Strong Acid & a Strong Base reacts? A) Neutral salt and water. B) Acidic Salt. C) Basic salt. D) Acidic and Basic salt both. Show Answer Correct Answer: A) Neutral salt and water. 21. Examples:cola, vinegar, orange juice A) Acid. B) Base. C) Neutral. D) None of the above. Show Answer Correct Answer: A) Acid. 22. Acids have a pH of ..... A) Below 7. B) Above 7. C) Exactly 7. D) None of the above. Show Answer Correct Answer: A) Below 7. 23. Which of the following substances is basic? A) Soda. B) Lemon juice. C) Soap. D) Vinegar. Show Answer Correct Answer: C) Soap. 24. The building block of nucleic acids are nucleotides. Nucleotides are composed of a sugar, a phosphate group, and a ..... base. A) Oxygen. B) Hydrogen. C) Nitrogen. D) Carbon. Show Answer Correct Answer: C) Nitrogen. 25. HNO$_{3}$ + H$_{2}$O $\rightarrow$ H$_{3}$O$^{+}$ + NO$_{3}$$^{1-}$ NO$_{3}$$^{1-}$ is the conjugate base of A) H$_{2}$O. B) HNO$_{3}$. C) H$_{3}$O$^{+}$. D) None of the above. Show Answer Correct Answer: B) HNO$_{3}$. ← PreviousNext →Related QuizzesClass 7 Science Chapter 4 Bases Quiz 1Class 7 Science Chapter 4 Bases Quiz 2Class 7 Science Chapter 4 Bases Quiz 4Class 7 Science Chapter 4 Bases Quiz 5Class 7 Science Chapter 4 Bases Quiz 6Class 7 Science Chapter 4 Bases Quiz 7Class 7 Science Chapter 4 Bases Quiz 8Class 7 Science Chapter 4 Bases Quiz 9Class 7 Science Chapter 4 Bases Quiz 10Class 7 Science Chapter 4 Bases Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books