Ncert- science – class 7- Chapter 4 – Acids, Bases and Salts 2 Welcome to your Ncert- science - class 7- Chapter 4 – Acids, Bases and Salts 2 1. To protect tooth decay we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is: Basic Corrosive Acidic Neutral None 2. Which one of the following types of medicines is for treating indigestion ? Analgesic Antacid Antibiotic Antiseptic None 3. Which of the following acid is present in the sting of an ant? Tartaric acid Succinic acid Oxalic acid Formic acid None 4. Which of the following is a use of Al(OH)3 It is used in removing stains of grease from cloths It is used in the preparation of fertilizers It is used in fire extinguisher as a foaming agent It is used as an antacid None 5. In which of the following chemical processes does the reaction mixture become hot? Evaporating liquid water Mixing two samples of an acid Mixing two samples of a base Neutralisation of an acid with a base None 6. The acid used in the making of vinegar is: nitric acid sulphuric acid acetic acid formic acid None 7. Milk of magnesia Mg(OH) 2 is a/an: alkali acid rock salt antacid None 8. Which substance when dissolved in water changes red litmus paper to blue. Tooth paste Shower cream Milk of magnesia All of the above None 9. A drop of a liquid sample was put on the pH paper. The color of the pH paper turned blue. The liquid sample could be that of: Hydrochloric acid Lemon juice Sodium bicarbonate solution Ethanoic acid None 10. Which of the following set of substances contain acids only? Vinegar, soap Curd, vinegar Grapes, lime water Curd, milk of magnesia None 11. Which base is employed as the electrolyte in alkaline batteries? KOH Al(OH)3 FeOH NaOH None 12. Manisha took a little bit of soil from her garden and mixed it with water. When she dipped a blue litmus in it, the litmus turned red. By adding which of the following to her garden will she get better plant growth? Slaked lime Salt Hydrochloric acid Water None 13. On washing with soap, a turmeric stain on the cloth turns to red becauseA. soap solution is alkaline.B. soap solution is acidic.C. turmeric contains a natural indicator.D. turmeric contain litmus.Select the correct alternative. A and C A and D B and D C and B None 14. Which of the following set of substances contain acids only? Curd, milk of magnesia Vinegar, soap Grapes, lime water Curd, vinegar None 15. In an experiment to test the pH of a given sample using pH paper, four students recorded the following observations :SamplepH Paper ColorWaterBlueDilute HClRedDilute NaOHBlueDilute Ethanoic AcidOrange Which one of the above observations is incorrect. I III II IV None 16. Which of the following is a use of sodium hydroxide? It is used in the manufacture of soaps and paper. It is an important constituent of drain cleaners. All of the above. It is used in the manufacture of synthetic fibers like rayon. None 17. One of the following that does not inject an acidic liquid into the skin through its sting. This is Honey bee Wasp Ant Nettle leaf hair None 18. An aqueous solution turns red litmus blue. Excess addition of which of the following solutions would reverse the change? None of these Ammonium hydroxide solution Hydrochloric acid Water None 19. Phenolphthalein is a synthetic indicator and its color in acidic and basic solutions, respectively are: colorless and pink blue and red red and blue pink and colorless None 20. Which pair of indicators shows no colour change when used with acidic solutions? China rose and phenolphthalein Litmus and China rose Turmeric and phenolphthalein Turmeric and China rose None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
