CLASS-VII DAV PUBLIC SCHOOL SEC-14 & 48 GURGAON SUB: SCIENCE TOPIC: ACIDS, BASES AND SALTS
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1 A. Choose the correct option/options: 1. Which of the following is not an indicator? a. Blue litmus b. Red Litmus. c. Turmeric d. Digene 2. Which of the following is a strong acid? a. Nitric acid b. Citric acid c. Acetic acid d. Tartaric acid 3. Which of the following is not an organic acid? a. Oxalic Acid b. Acetic Acid c. Sulphurous Acid d. Tartaric Acid 4. What is the common name of sodium bicarbonate? a. Phitkari b. Caustic soda c. Baking powder d. Blue vitriol 5. Acids turn blue litmus: a. Yellow b. Orange c. Red d. Black 6. An acid reacts with a base to form: a. Acidic Oxide b. Salt and water c. Basic Oxide d. Metal oxide 7. Which one of the following is known as the king of chemicals: a. Nitric Acid b. Sulphuric Acid c. Citric Acid d. Acetic Acid 1
2 8. A list of some common items and their approximate ph values are given below. Which of the following items would turn blue litmus paper red? a) Eggs b) Pure water c) Ammonia d) Tomato 9. A student finds that a solution has no effect on litmus or phenolphthalein, but does conduct a current. The solution would be classified as a : a) acids b) salts c) bases d) soap 10. Certain materials can act as indicators because they change. a) acidity b) color c) concentration d) taste 11. An unknown substance dissolves easily in water, and turns blue litmus paper red. The substance is most likely a (n). a) Base b) Ester c) Salt d) Acid 2
3 B In the following picture examples of alkali and bases are given: Now differentiate between bases and alkali giving examples: BASE ALKALI (a) (b) (c) (d) (e) (f) (g) (h) C. Fill in the blanks: Bases have a taste. Acids which are present in citrus fruits and sour curd belong to the group of acids. When acid and base react together a new compound called is formed Mineral acids are obtained from. Turmeric is a indicator. A salt is a compound formed by replacing the in an acid by a metal. Carbonates are obtained from acid, whose formula is. An is a base that is soluble in water. 3
4 D. Give the answer of following: 1. Why sulphuric acid is known as the king of chemicals? 2. How will you make dilute HCl from conc. HCl? 3. What is an indicator? Give examples of three natural indicators. 4. Write two examples each of (i) Strong acid (ii) Strong base (iii) Weak acid (iv) Weak base (v) Neutral salt (vi) Acidic salt (vii) Basic salt 5. Differentiate between the following giving examples: ACID BASE 4
5 6. You are provided with three colorless solutions-dil.hcl, dil. NaOH and water And a few test tubes. Without tasting how will you know which one of them is water? Give reasons for the following: e) An antacid tablet is taken when you are suffering from acidity. f) Moist baking soda is applied on skin when an ant bites. g) Factory waste is neutralized before disposing it into the water bodies. Define Acid, Base and Salt by giving two examples of each. 5
6 FOLLOWING TABLE GIVES INFORMATION ABOUT VARIOUS COLOR CHANGES IN VARIOUS SUBSTANCES: INDICATOR TYPE OF COLOUR IN ACIDS COLOUR IN BASES SALTS INDICATOR LITMUS BLUE NATURAL RED NO CHANGE NO CHANGE LITMUS RED NATURAL NO CHANGE BLUE NO CHANGE PHENOLPHATHALEIN SYNTHETIC COLOURLESS PINK NO CHANGE METHYL ORANGE SYNTHETIC ORANGE YELLOW NO CHANGE TURMERIC NATURAL NO CHANGE RED NO CHANGE RED CABBAGE NATURAL PINK GREEN NO CHANGE CHINA ROSE NATURAL RED GREEN NO CHANGE NOW TEST THE VARIOUS SUBSTANCES USING LITMUS INDICATOR AND WRITE YOPUR OBSERVATIONS: S. NO. 1 SUBSTANCES TO BE TESTED EFFECT ON BLUE LITMUS EFFECT ON RED LITMUS ACIDIC, BASIC OR NEUTRAL? NOW TEST THE VARIOUS SUBSTANCES USING PHENOLPHATHALEIN INDICATOR AND WRITE YOUR OBSERVATIONS: S. NO. 1 SUBSTANCES TO BE TESTED EFFECT DUE TO INDICATOR ACIDIC, BASIC OR NEUTRAL?
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