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प्रश्न
State one observation for each of the following :
A small piece of zinc is added to dilute hydrochloric acid
उत्तर
Bubbles of H2 gas observed.
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संबंधित प्रश्न
How will you test for the presence of this gas?
It has been found that rubbing vinegar on the stung area of the skin of a person gives him relief. The person has been stung by:
(a) wasp
(b) ant
(c) honey bee
(d) nettle leaf hair
Define the following term: Acid.
If iron reacts with dilute sulphuric acid, what will be the products?
Since metal carbonate and metal bicarbonate are basic, they react with acids to give salt and water with the liberation of ______.
While playing in a park, a child was stung by a wasp. Some elders suggested applying a paste of baking soda and others lemon juice as a remedy. Which remedy do you think is appropriate and why?
Citric acid is present in ______.
Write the important uses of hydrochloric acid and sulphuric acids.
Acidic or basic solutions are good conductors of electricity. Justify your answer.
Match the following:
| 1. | The hardest substance in our body | a. | Aluminum phosphate |
| 2. | Citrus fruits | b. | Potash alum |
| 3. | Rice plant | c. | Insoluble in water |
| 4. | Double salts | d. | Acidic soil |
| 5. | Silver chloride | e. | Calcium phosphate |
| f. | Alkaline soil |
