Acid bases and salt Test 4 (Chemistry) Welcome to your Acid bases and salt Test 4 (Chemistry) Name Email 1.Which acid does vinegar contain? (a) Tartaric acid (b) Nitric acid (c) Acetic acid (d) Citric acid None 2.What does ‘p’ stand for in ‘pH’? (a) Precipitation (b) Percentage (c) Potency (d) Potenz None 3. Which of the following is another name of folic acid? (a) Lactic acid (b) Pteroylglutamic acid (c) Ascorbic acid (d) Glycolic acid None 4.When an ant bites, it injects acidic liquid (formic acid) into the skin. What among the following should be applied to the skin to neutralise it? (a) Lime juice (b) Tomato pulp (c) Moist baking soda (d) Bleaching None 5.All acids generate ______ gas reacting with metals. (a) hydrogen (b) nitrogen (c) chlorine (d) oxygen None 6.Which of the following is NOT a natural acid-base indicator? (a) Geranium flowers (b) Red cabbage leaves (c) Petunia flowers (d) Thyme leaves None 7. What is the pH value of acidic substances? (a) Below 1.0 (b) Below 3.0 (c) Below 2.0 (d) Below 7.0 None 8.What is the molecular formula for hydrochloric acid? (a) H 2 SO 4 (b) HNO 3 (c) KOH (d) HC None 9.In which of the following options is the substance INCORRECTLY paired with the acid present in that substance? (a) Tomato - Oxalic Acid (b) Vinegar - Acetic Acid (c) Orange - Citric Acid (d) Lemon - Lactic Acid None 10. Litmus paper changes to ______ colour when put in soap water. (a) blue (b) red (c) yellow (d) orange None 11. Primarily, an ant’s sting has which of the following? (a) Tartaric acid (b) Magnesium hydroxide (c) Citric acid (d) Formic acid None 12. Which of the following liquids has the highest pH? (a) Human blood (b) Milk of magnesia (c) Lemon juice (d) Orange juice None 13.What is the pH of rainwater during acid rain? (a) More than 5.6 (b) Between 6 to 8.5 (c) Equal to 5.6 (d) Less than 5.6 None 14.When blue litmus was added to an unknown liquid in a test tube, it turned red. What was the liquid? (a) An acid (b) Saline (c) An alkali (d) Water None 15. The pH of a liquid was found to be 7. Which liquid is it likely to be? (a) Alkali (b) Acid (c) Water (d) Saline None 16.What is the chemical name of the salt found abundantly in seawater? (a) Sodium Nitrite (b) Sodium Acetate (c) Sodium Chloride (d) Sodium Tartrate None 17.Within what pH range does the human body work? (a) 8.2 to 8.9 (b) 6 to 6.2 (c) 7 to 7.8 (d) 9.3 to 9.6 None 18.Which of the following has pH value nearest to zero? (a)Concentrated Hydrochloric Acid (b)Baking Soda (c)Ammonia (d)Pure Water None 19.Which of the following acid-source pairs is correctly matched? (a)Formic Acid - Tamarind (b)Citric Acid - Lemon (c)Acetic Acid - Ant’s sting (d)Lactic Acid - Vinegar None 20.Which of the following pairs of Base-Source are correctly matched ? (a)Calcium Hydroxide - Soap (b)Sodium Hydroxide - Milk of magnesia (c)Ammonium Hydroxide - Window cleaner (d)Magnesium Hydroxide - Lime water None 21.Salinity is the amount of salt in grams present in ______. (a)1000 grams of water (b)100 grams of water (c)10000 grams of water (d)10 grams of water None 22.A reaction between an acid and a base is known as _______. (a)Evaporation (b)Sublimation (c)Neutralization (d)Acidification None 23.At what pH value tooth starts to decay? (a)11.2 (b)6.5 (c)5.5 (d).75 None 24.Which gas is produced when metals react with Dilute Acids? (a)Nitrogen (b)Hydrogen (c)Carbon Dioxide (d)Oxygen None 25.Which of the following gases turn lime water milky? (a) Hydrogen (b) Oxygen (c) Nitrogen (d)Carbon dioxide None 26.The pH of pure water (H 2 O) is ____ at 25 degree Celsius. (a)7 (b)6 (c)8 (d)9 None 27.Blue litmus paper turns ___ on contact with an acidic solution. (a) red (b) brown (c) green (d) yellow None 28.Metal oxides are ________ in nature. (a) acidic (b) organic (c) basic (d) neutral None Time's up
