Available Answers

1. 1.

   Would the results of dry baking soda and solution of baking soda on dry litmus paper be same? Why?

2. 2.

   Check point:

   1. The acid present in our stomach is _________________.
      1. Nitric acid
      2. Hydrochloric acid
      3. Sulphuric acid
      4. Carbonic acid
   2. The colour of china rose indicator in acids is _________________.
      1. Red
      2. Orange
      3. Magenta
      4. Green
   3. Acidic soil can be neutralized by adding _________________.
      1. Quick lime
      2. Formic acid
      3. Nitric acid
      4. Vinegar
   4. Litmus is extracted from _________________.
      1. Mushroom
      2. Grass
      3. Algae
      4. Lichen
   5. With distilled water, litmus paper will show _________________.
      1. Blue colour
      2. Red colour
      3. Magenta colour
      4. No change
   6. A bee sting can be neutralized by _________________.
      1. Baking soda
      2. Formic acid
      3. Vinegar
      4. Lime juice
   7. Which of these acids is present in curd?
      1. Oxalic acid
      2. Lactic acid
      3. Maleic acid
      4. Tartaric acid
3. 3.

   True-False:

   1. Bases are sour in taste.
   2. Sulphuric acid is used in car batteries.
   3. We use antacids to get relief from acidity.
   4. Indicators change their colour in acids and bases.
   5. Turmeric indicator turns green in acids.
4. 4.

   Fill in the blanks:

   1. Acids are _________________ in taste and bases are _________________ in taste.
   2. When an acid reacts with a base, _________________ is formed along with water.
   3. Substances that are neither acidic nor basic are called _________________.
   4. To neutralize an acidic soil, we add _________________ or _________________.
   5. Acids turn _________________ litmus to _________________ whereas bases turn _________________ litmus to _________________.
   6. _________________ acid is present in ant sting.
5. 5.

   Match the following:

   Column A	Column B
   1. Sour Milk	(a) Citric acid
   2. Citrus Fruits	(b) Acetic Acid
   3. Tamarind	(c) Maleic acid
   4. Spinach	(d) Tartaric acid
   5. Vinegar	(e) Ascorbic acid
   6. Amla	(f) Lactic acid
   7. Green apple	(g) Oxalic acid

    

6. 6.

   What substances are formed when an acid reacts with a base?