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प्रश्न
What happens during a wasp sting? What is its remedy?
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
Name one animal and one plant whose stings contain formic acid (or methanoic acid).
Define the term ‘basicity’ of an acid.
Give two examples of the following:
oxy-acid
Do basic solutions also have H+(aq)? Why are they basic?
Identify the following solutions, whether they are acid or base.
| Solution | Change in Indicator | Acid/Base | ||
| Litmus | Phenolphthalein | Methyl orange | ||
| 1. | -- | No change | -- | |
| 2. | -- | -- | Orange colour turns red | |
| 3. | Red litmus turns blue | -- | -- | |
Give four examples of preparation of acids by synthesis.
Choose the correct answer from the options given below
Which of them occurs in solid state?
Fill in the missing data in the following table
| Name of the salt | Formula | Salt obtained from | ||
| Base | Acid | |||
| (i) | Ammonium chloride | NH4Cl | NH4OH | ______ |
| (ii) | Copper sulphate | ______ | ______ | H2SO4 |
| (iii) | Sodium chloride | NaCl | NaOH | ______ |
| (iv) | Magnesium nitrate | Mg(NO3)2 | ______ | HNO3 |
| (v) | Potassium sulphate | K2SO4 | ______ | ______ |
| (vi) |
Calcium nitrate | Ca(NO3)2 | Ca(OH)2 | ______ |
Complete the following equation.
HCl + ______ → NaCl + H2O
The acid which contains four hydrogen atoms ______.
