Chapter-5 ➤ Acids, Bases and Salts 1. Products of a neutralisation reaction are always: an acid and a base an acid and a salt a salt and water a salt and a base 2. Out of these gases which one is used in fire extinguishers CO2 SO2 NO2 H2S 3. Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are: red and blue blue and red pink and colourless colourless and pink 4. An oxide is acidic and has a pungent odour. It could be sulphur dioxide carbon dioxide sodium oxide nitrogen dioxide 5. Which of the following set of substances contain acids? Grapes, lime water Vinegar, soap Curd, milk of magnesia Curd, vinegar 6. When the soil is too basic, plants do not grow well in it. To improve its quality what must be added to the soil? Organic matter Quick lime Slaked lime Calamine solution 7. The correct way of making a solution of acid in water is to add water to acid add acid to water mix acid and water simultaneously add water to acid in a shallow container 8. On adding phenolphthalein indicator to a colourless solution, no change is observed. What is the nature of this solution? Basic Either acidic or basic Either acidic or neutral Either basic or neutral 9. Which of the following is an acid-base indicator? Vinegar Lime water Turmeric Baking soda 10. Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed. Yellow in both acid and base Yellow in acid and red in base Pink in acid and yellow in base Red in acid and blue in base Loading … Question 1 of 10
