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प्रश्न
When a solution is added to vanilla extract, then the characteristic smell of vanilla cannot be detected. State whether the given solution is an acid or a base.
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उत्तर
The given solution is a base. Vanilla acts as an olfactory indicator, a substance whose odour changes or gets destroyed in the presence of acidic or basic solutions. While acids retain the characteristic smell of vanilla, bases eliminate it entirely.
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संबंधित प्रश्न
Name one natural source of the following acid:
Citric acid
Name one animal whose stings contain formic acid (or methanoic acid).
What colour does the turmeric paper turn when put in an alkaline solution?
What are organic acids?
Water is never added to acid in order to dilute it why?
Explian the following:
Dil. HCl acid is stronger than highly concentrated acetic acid.
What is the difference between an alkali and a base?
Which are the industrial uses of acids?
Give the name and formula of two : Strong monobasic acids
Give the name and formula of two : Weak dibasic acids
Define a base.
Solution A is strong acid B weak acid C strong alkali.
Which solution contains solute molecules in addition to water molecules?
Acids are corrosive in nature.
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.
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 | ______ |
State whether the following statement is true or false. Correct the false statement.
All substances are either acidic or basic.
Paheli observed that most of the fish in the pond of her village were gradually dying. She also observed that the waste of a factory in their village is flowing into the pond which probably caused the fish to die.
- Explain why the fish were dying.
- If the factory waste is acidic in nature, how can it be neutralised?
Acidic or basic solutions are good conductors of electricity. Justify your answer.
To Interpret:
CH4 and NH3, are not acids.
Which one of the following will not produce an acid when made to react with water.
