This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Acids – Quiz 42 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Acids Quiz 42 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is a mixture of chemicals that react with a base/acid to keep pH in a particular range? A) Catalyst. B) Enzyme. C) Water. D) Buffer. Show Answer Correct Answer: D) Buffer. 2. . What is a property of bases? A) Slippery touch. B) Sour taste. C) Ability to dissolve metal. D) Ability to form hydronium ions. Show Answer Correct Answer: A) Slippery touch. 3. Oxalic acids is present in A) Grapes. B) Vinegar. C) Apples. D) Spinach. Show Answer Correct Answer: D) Spinach. 4. Acid + base $\rightarrow$? A) Salt + hydrogen gas + water. B) Salt + carbon dioxide + water. C) Salt + water. D) Salt only. Show Answer Correct Answer: C) Salt + water. 5. ..... are examples of purine bases A) Adenine and Guanine. B) Thymine and Cytosine. C) Adenine only. D) Guanine only. Show Answer Correct Answer: A) Adenine and Guanine. 6. Two amino acids that contain sulfur atoms are: A) Cysteine and serine. B) Cysteine and threonine. C) Methionine and cysteine. D) Methionine and serine. Show Answer Correct Answer: C) Methionine and cysteine. 7. RNA is usually A) Single stranded. B) Double stranded. C) Triple stranded. D) All of these. Show Answer Correct Answer: A) Single stranded. 8. What type of paper is used to test for acids and bases? A) Red paper. B) Blue paper. C) Lined paper. D) Litmus paper. Show Answer Correct Answer: D) Litmus paper. 9. These kind of acids are natural ..... A) Organic. B) Mineral. C) All the above. D) None of the above. Show Answer Correct Answer: A) Organic. 10. 7 on the pH scale means that it is ..... A) Acidic. B) Basic. C) Neutral. D) None of the above. Show Answer Correct Answer: C) Neutral. 11. Antacids contain A) Weak base. B) Strong base. C) Strong acid. D) Weak acid. Show Answer Correct Answer: A) Weak base. 12. Value from 0-14 that determine the acidity of a solution A) PH scale. B) Base. C) Number line. D) Acid. Show Answer Correct Answer: A) PH scale. 13. When NaOH and HCl are mixed in equal molar quantities, the result is A) The formation of salt +H$_{2}$O. B) The formation of salt +H$_{2}$(g). C) The formation of salt +O$_{2}$(g). D) All above are correct. Show Answer Correct Answer: A) The formation of salt +H$_{2}$O. 14. Ammonia (NH$_{3}$) is a A) Weak Acid. B) Weak Base. C) Strong Acid. D) Strong base. Show Answer Correct Answer: B) Weak Base. 15. Which molecule brings the amino acid to the ribosome? A) DNA. B) MRNA. C) TRNA. D) RRNA. Show Answer Correct Answer: C) TRNA. 16. NaOH is a strong base.What is the pH of a 0.01 M NaOH soltuion? A) 2. B) 9. C) 12. D) 14. Show Answer Correct Answer: C) 12. 17. What does a pH scale do? A) Tells if a substance is an acid or base. B) Measures the strength and weakness of acids and bases. C) Both statements are correct. D) None of the above. Show Answer Correct Answer: C) Both statements are correct. 18. What is the chemical symbol for Sulfuric Acid A) HS2O4. B) H2SO4. C) H4SO2. D) Are. Show Answer Correct Answer: B) H2SO4. 19. Organic acids are A) Weak acids. B) Strong acids. C) Main acids. D) Nice acids. Show Answer Correct Answer: A) Weak acids. 20. Calcium hydroxide is found in A) Window cleaner. B) Lime water. C) Soap. D) Lime juice. Show Answer Correct Answer: B) Lime water. 21. Bases are what range on the pH scale? A) 0-6.99. B) 7. C) 7.1-14. D) 0-14. Show Answer Correct Answer: C) 7.1-14. 22. Metal carbonates react with acid to form A) Salt, carboxylic acid and water. B) Salt and carbonated water. C) Salt, carbon dioxide and water. D) Salt and hydrogen. Show Answer Correct Answer: C) Salt, carbon dioxide and water. 23. What is the formula for perchloric acid? A) H$_{3}$ClO$_{3}$. B) H$_{3}$ClO$_{4}$. C) HCLO $ _ {3} $. D) HClO4. Show Answer Correct Answer: D) HClO4. 24. A ..... is a substance that produces hydroxide ions, OH$^{-}$ when it dissolves in water. A) Acid. B) Base. C) Hydronium Ion. D) Basic anhydride. Show Answer Correct Answer: B) Base. 25. Which substance is avid? A) Toothpaste. B) Vinegar. C) Soap. D) Ammonia. Show Answer Correct Answer: B) Vinegar. ← PreviousNext →Related QuizzesClass 7 Science Chapter 4 Acids Quiz 1Class 7 Science Chapter 4 Acids Quiz 2Class 7 Science Chapter 4 Acids Quiz 3Class 7 Science Chapter 4 Acids Quiz 4Class 7 Science Chapter 4 Acids Quiz 5Class 7 Science Chapter 4 Acids Quiz 6Class 7 Science Chapter 4 Acids Quiz 7Class 7 Science Chapter 4 Acids Quiz 8Class 7 Science Chapter 4 Acids Quiz 9Class 7 Science Chapter 4 Acids Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books