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प्रश्न
What happens during a bee sting? What is its remedy?
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उत्तर
When a bee stings a person, it injects an acidic solution into the person’s skin. This causes severe pain and irritation. The remedy is to apply a baking soda solution (sodium hydrogen carbonate, a base). The solution soothes the pain by neutralising the acid.
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संबंधित प्रश्न
Give the names and formulae of two strong acids.
Name the acid-base indicator extracted from lichen.
What is produced if an acid is added to a base?
Give two examples of the following:
oxy-acid
Name an acid used to flavor and preserve food.
Out of HCl and CH3COOH, which one is a weak acid and why? Describe an activity to support your answer.
Give the name and formula of two : Non-volatile acids
How is an acid prepared from a non metal and a base from a metal? Give equation.
Fill in the blank
Vinegar is the source of ________ acid.
Choosing the correct words given in brackets, complete the sentence given below:
A(n) ______ (acid/basic) salt is one in which the hydrogen of an acid has been partially replaced by a ______ (metal/non-metal).
Complete the following table and write one equation for each to justify the statement:
|
Reactants |
Products |
Method |
|
Soluble base + Acid (dil) |
Salt + water |
Neutralisation Titration |
|
Metal + Non-metal |
Salt (soluble/insoluble) |
______ |
|
Insoluble base + ______ |
Salt (soluble) + water |
______ |
|
Active metal + Acid (dil) |
______ + ______ |
______ |
|
Soluble salt solution (A) + Soluble salt solution (B) |
Precipitated salt + Soluble salt |
______ |
|
Carbonate/bicarbonate + Acid (dil) |
Salt + ______ + ______ |
Decomposition of carbonate |
|
Chlorides/nitrates + Acid (conc.) |
______ + ______ |
Decomposition of chlorides and nitrates |
Acids are corrosive in nature.
What are the uses of acids?
What happens when a solution of an acid is mixed with a solution of a base in a test tube?
(i) Temperature of the solution decreases.
(ii) Temperature of the solution increases.
(iii) Temperature of the solution remains the same.
(iv) Salt formation takes place.
Which of the following is not a mineral acid?
State whether the following statement is true or false. Correct the false statement.
All substances are either acidic or basic.
State whether the following statement is true or false. Correct the false statement.
A compound if acidic will turn all indicators red.
Match the substances in Column I with those in Column II.
| Column 1 | Column II | ||
| (a) | Tartaric acid | (i) | soap |
| (b) | Calcium hydroxide | (ii) | curd |
| (c) | Formic acid | (iii) | unripe mangoes |
| (d) | Sodium hydroxide | (iv) | ant’s sting |
| (e) | Lactic acid | (v) | lime water |
Complete the following equation.
H+ + H2O → ______.
Name the acid present in grapes.
