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प्रश्न
What happens during a wasp sting? What is its remedy?
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उत्तर
When a wasp stings a person, it inserts an alkaline solution into the person’s skin. This causes severe pain and irritation. The remedy is to apply a weak acid, such as vinegar, to the wound. The acid neutralises the alkaline solution and soothes the pain.
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संबंधित प्रश्न
Tooth decay is caused by the presence of a base.
What are organic acids?
Give two examples of organic acids.
Write any two important uses of bases.
Name a sodium compound which is a constituent of many dry soap powders.
The word sour refers to ______ in Latin.
Most of the acids are not soluble in water.
Acids are corrosive in nature.
Vinu and Priyan take their lunch at school. Vinu eats lemon rice and Priyan eats curd rice. Both lemon rice and curd rice are sour in taste. What is the reason?
Since metal carbonate and metal bicarbonate are basic, they react with acids to give salt and water with the liberation of ______.
An aqueous solution turns red litmus solution blue. Excess addition of which of the following solutions would reverse the change?
Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed
Which of the following set of substances contain acids?
Fill in the cross word given in figure with the help of the clues provided.
Across
(2) The solution which does not change the colour of either red or blue litmus.
(4) Phenolphthalein gives pink colour in this type of solution.
(7) Colour of blue litmus in lemon juice.
Down
(1) It is used to test whether a substance is acidic or basic.
(3) It is a natural indicator and gives pink colour in basic solution.
(5) Nature of ant’s sting.
(6) It is responsible for the increase in temperature during a neutralisation reaction.
______ acids have a relatively smaller amount of acids dissolved in a solvent.
Complete the following equation.
CaO + H2SO4 → ______ + H2O
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 |
Name the acid present in grapes.
Name the acid present in lemon.
