This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Bases – Quiz 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Bases Quiz 2 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the Latin root of the word video? A) At. B) Deo. C) Vis. D) Video. Show Answer Correct Answer: A) At. 2. Two or more different elements chemically combine to form compounds. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 3. What is the formula of sulfuric acid? A) HCl. B) H$_{2}$SO$_{4}$. C) HNO$_{3}$. D) H$^{+}$. Show Answer Correct Answer: B) H$_{2}$SO$_{4}$. 4. PH range for acidic substances A) 0-7. B) 7. C) 7-14. D) None of the above. Show Answer Correct Answer: A) 0-7. 5. Acids have a pH A) Greater than 7. B) Lower than 7. C) Equal to 7. D) None of the above. Show Answer Correct Answer: B) Lower than 7. 6. Select the name for the following base:CaOH A) Calcium hydroxide. B) Calcium (I) hydroxide. C) All the above. D) None of the above. Show Answer Correct Answer: A) Calcium hydroxide. 7. What is the formula of magnesium oxide? A) MgO. B) Mg$_{2}$O. C) MgO$_{2}$. D) Mg$_{2}$O$_{2}$. Show Answer Correct Answer: A) MgO. 8. A scientist runs tests on an unknown substance. He finds that it is extremely corrosive. It produces H+ ions in solution. And, it has a pH of 1. What type of substance has he identified? A) Weak acid. B) Strong acid. C) Weak base. D) Strong base. Show Answer Correct Answer: B) Strong acid. 9. Lemon juice A) Acid. B) Base. C) All the above. D) None of the above. Show Answer Correct Answer: A) Acid. 10. Select the name for the following acid:HNO$_{3}$ A) Nitric acid. B) Nitrous acid. C) Hydronitric acid. D) None of the above. Show Answer Correct Answer: A) Nitric acid. 11. What does the Latin root mit mean? A) To send. B) Father. C) To write. D) Mitten. Show Answer Correct Answer: A) To send. 12. What is the Latin root of the word percent? A) Percent. B) Per. C) Cent. D) One hundred. Show Answer Correct Answer: C) Cent. 13. When china rose indicator was added to lime water, what colour change will be detected? A) Green. B) Dark pink. C) Reddish pink. D) No colour change. Show Answer Correct Answer: A) Green. 14. The formula for sulfuric acid is ..... A) HCl. B) H$_{2}$Cl. C) H$_{2}$SO$_{4}$. D) HSO $ _ {4} $. Show Answer Correct Answer: C) H$_{2}$SO$_{4}$. 15. Antonino ate a drowned cake with a lot of Chile and lemon, minutes later it has a strong stomach pain He must: A) Take a soda to be removed. B) Take a cup of coffee since this is acidic and neutralizes the pH of the stomach. C) Take aluminum hydroxide because neutralizes the pH of the stomach. D) Take an aspirin (acetylsalicylic acid). Show Answer Correct Answer: C) Take aluminum hydroxide because neutralizes the pH of the stomach. 16. If the H$^{+}$ concentration of a solution is 2.8 x 10$^{-9}$, what is the pOH? A) 9.00. B) 8.55. C) 5. D) 5.45. Show Answer Correct Answer: D) 5.45. 17. Which of the following is a property of bases? A) Sour taste. B) Slippery feel. C) Turns red litmus paper blue. D) Reacts with metals to produce hydrogen gas. Show Answer Correct Answer: C) Turns red litmus paper blue. 18. Identify the cardinality of the statement:a customer can have different email accounts, but each email account belongs to a specific customer. A) One by one. B) One to many. C) Many to many. D) None of the above. Show Answer Correct Answer: B) One to many. 19. A base is a substance A) That releases OH-ions when dissolved in water. B) That releases H+ ions when dissolved in water. C) Does not release any ions when dissolved in water. D) None of the above. Show Answer Correct Answer: A) That releases OH-ions when dissolved in water. 20. Which of the following are the four nitrogenous bases found in DNA? A) Adenine, Thymine, Cytosine, Guanine. B) Adenine, Uracil, Cytosine, Guanine. C) Adenine, Thymine, Cytosine, Uracil. D) Adenine, Thymine, Guanine, Uracil. Show Answer Correct Answer: A) Adenine, Thymine, Cytosine, Guanine. 21. Assertion (A):Salts are the products of an acid-base reaction. Reason (R):Salt may be acidic or basic. 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: B) Both A and R are true but R is not the correct explanation of A. 22. Select the formula for the following acid:phosphorous acid A) H$_{3}$PO$_{3}$. B) H$_{3}$PO$_{4}$. C) H$_{3}$P. D) None of the above. Show Answer Correct Answer: A) H$_{3}$PO$_{3}$. 23. When a metal carbonate reacts with an acid, what will the products always be? A) A salt, water and oxygen. B) A salt, water and carbon dioxide. C) Water and hydrogen. D) A salt and water. Show Answer Correct Answer: B) A salt, water and carbon dioxide. 24. When equal amounts of acid are mixed with a base they produce a solution with a pH ..... A) Greater than 7. B) Lower than 7. C) Equal to 7. D) None of the above. Show Answer Correct Answer: C) Equal to 7. 25. HC$_{2}$H$_{3}$O$_{2}$ + H$_{2}$O $\rightarrow$ H$_{3}$O$^{+}$ + C$_{2}$H$_{3}$O$_{2}$$^{1-}$HC$_{2}$H$_{3}$O$_{2 }$is acting as A) A conjugate base. B) A Bronsted Lowry base. C) A Bronsted Lowry acid. D) None of the above. Show Answer Correct Answer: C) A Bronsted Lowry acid. ← PreviousNext →Related QuizzesClass 7 Science Chapter 4 Bases Quiz 1Class 7 Science Chapter 4 Bases Quiz 3Class 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