Chapter 5 – Acids, Bases and Salts
Assignment 1
Q.1. Acids
(a) have sour taste
(b) are corrosive in nature
(c) are soluble in water
(d) have all of these properties
Q.2. Alkalis
(a) have sour taste
(b) are soluble in water
(c) turn blue litmus red
(d) have all of these properties
Q.3. Which of the following is not a base?
(a) sodium hydroxide
(b) magnesium hydroxide
(c) copper carbonate
(d) ammonium hydroxide
Q.4. Which of these metals cannot be used to prepare hydrogen by the action of an acid?
(a) sodium
(b) iron
(c) calcium
(d) copper
Q.5. What is the common name of sodium bicarbonate?
(a) phitkari
(b) caustic soda
(c) baking soda
(d) blue vitriol
Q.6. Lime juice will turn
(a) blue litmus red
(b) methyl orange yellow
(c) red litmus blue
(d) phenolphthalein pink
Q.7. Sodium chloride will turn
(a) blue litmus red
(b) methyl orange yellow
(c) red litmus blue
(d) none of the above
Q.8. Which of the following is not an acid-base indicator?
(a) blue litmus
(b) methyl orange
(c) phenolphthalein
(d) Digene
Q.9. Which of the following is a strong acid?
(a) nitric acid
(b) citric acid
(c) acetic acid
(d) tartaric acid
Q.10. Which of these is a salt–hydrochloric acid, sodium hydroxide, sodium chloride?
Q.11. If a liquid turns blue litmus red, is it an acid, base or salt?
Q.12. Methyl orange has________colour in an acidic solution
Q.13. Turmeric turns_________in acidic solutions.
Q.14. An_________is a base that is soluble in water.
Q.15. Milk contains________acid.
Q.16. When water is added to a strong acid, it becomes dilute. True or false?
Q.17. A salt is formed when a metal displaces hydrogen from an acid. True or false?
Q.18. Name two acids that you can actually eat to enjoy the sour taste.
Q.19. Why are acids not stored in metal containers?
Q.20. Name two substances that have different colours in acidic and basic solutions. What is the general name for such substances?
Q.21. In which reaction of acids is their acidic nature cancelled out to produce a neutral substance? What is the neutral substance called?
Q.22. Acids are either mineral or organic–what is the difference between the two?
Q.23. All alkalis are bases but all bases are not alkalis. Why?
Q.24. Due to overuse of chemical fertilizers, the soil in a farm has become acidic and crop yields have dropped. What remedial action will you recommend to the farmer?
Q.25. Name the base used in the manufacture of soap.
Q.26. Excess of which acid in the stomach causes 'acidity'? How can this be corrected?
Q.27. All acids contain hydrogen. What happens if you replace this hydrogen with a metal?
Q.28. Which compounds are formed when an acid reacts with a base?
Q.29. Which acids are these salts obtained from?
(a) nitrates
(b) carbonates
(c) chlorides
(d) sulphates
Q.30. Is the 'baking soda' used in baking bread and cake an acid, a base or a salt? What is its chemical name and formula?
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