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greenish- blue?, (a) Lemon juice, (b) Vinegar, , (c) Common salt, (d) An antacid, , Question 8., , Which of the following gives the correct increasing, order of acidic strength?, , (a) Water < Acetic acid < Hydrochloric acid, , (b) Water < Hydrochloric acid < Acetic acid, , (c) Acetic acid < Water < Hydrochloric acid, , (d) Hydrochloric acid < Water < Acetic acid, , Question 9., , |f a few drops of a concentrated acid accidentally, spills over the hand of a student, what should be, done?, , (a) Wash the hand with saline solution., , (b) Wash the hand immediately with plenty of water, and apply a paste of sodium hydrogencarbonate., (c) After washing with plenty of water and apply, solution of sodium hydroxide on the hand., , (d) Neutralise the acid with a strong alkali., , Question 10., , Farmers neutralise the effect of acidity of the soil by, adding, , (a) slaked lime, , (b) gypsum

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Question 4., , The pH of a solution is 7. How can you increase its, pH?, , (a) By adding a small amount of acid, , (b) By adding a small amount of base., , (c) By adding a small amount of salt., , (d) By passing carbon dioxide gas through it., , Question 5., , Sodium carbonate is a basic salt because it is a salt, of, , (a) strong acid and strong base, , (b) weak acid and weak base, , (c) strong acid and weak base, , (d) weak acid and strong base, , Question 6., , Which gas is evolved when acids react with metals?, (a) Op, , (b) COz, , (c) He, , (d) No, , Question 7., , A sample of soil is mixed with water and allowed to, settle. The clear supernatant solution turns the pH, , paper yellowish-orange. Which of the following, would change the colour of this pH paper to

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Question 17., , Which one of the following can be used as an acidbase indicator by a visually impaired student?, , (a) Litmus, , (b) Turmeric, , (c) Vanilla essence, , (d) Petunia leaves, , Question 18., , What is gastric acid present in the stomach, composed of?, , (a) Hydrochloric acid, , (b) Sulphuric acid, , (c) Nitric acid, , (d) Lactic acid, , Question 19., , Which of the following is acidic in nature?, (a) Lime juice, , (b) Human blood, , (c) Lime water, , (d) Antacid, , Question 20., , When the solution of an acid is diluted, what will be, the change in pH of the solution?, , (a) pH of the solution remains the same, , (b) pH of the solution will increase, , (c) pH of the solution decreases

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(c) caustic soda, (d) baking soda, , Question 11., , A teacher gave two test tubes to the students, one, containing water and the other containing sodium, hydroxide. She asked them to identify the test tube, containing sodium hydroxide solution. Which one of, the following can be used for the identification?, , (a) Blue litmus, , (b) Red litmus, , (c) Sodium carbonate solution, , (d) Dilute hydrochloric acid, , Question 12., , One of the constituents of baking powder is sodium, hydrogencarbonate, the other constituent is, , (a) hydrochloric acid, , (b) tartaric acid, , (c) acetic acid, , (d) sulphuric acid, , Question 13., , Increase in the OH” ion concentration, leads to, (a) an increases in the pH of solution, , (b) a decrease in the pH of the solution, , (c) doesn't alter the pH of the solution, , (d) decreases the basic strength of the solution

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Question 14., , Which of the following statements is correct about, an aqueous solution of an acid and of a base?, , (i) Higher the pH, stronger the acid, , (ii) Higher the pH, weaker the acid, , (iii) Lower the pH, stronger the base, , (iv) Lower the pH, weaker the base, , (a) (i) and (iii), , (b) (ii) and (iii), (c) (i) and (iv), (d) (ii) and (iv), , Question 15., , A solution has turned the colour of red litmus paper, to blue. The pH of the solution is approximately:, , (a) 2, , (b) 5, (e) 7, (d) 10, , Question 16., , The pH of three solutions X, Y and Zis 6,4 and 8, respectively. Which of the following is the correct, order of acidic strength?, , (a)X>Y>Z, , (b) Z>Y>X, , (e) Yoko Zz, , (d)Z>X>Y