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प्रश्न
Define Acid.
Define the following term:
Acid
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उत्तर
An acid is a compound which when dissolved in water produces hydronium ion(H3O+), the only positively charged
ion and a negative ion.
संबंधित प्रश्न
Nitric acid turns red litmus blue.
Give the names and formulae of two strong acids.
Name one animal whose stings contain formic acid (or methanoic acid).
Why do HCl, H2SO4, HNO3, etc., show acidic character in aqueous solutions while solutions of compounds like C6H12O6 (glucose) and C2H5OH (alcohol) do not show acidic character?
What colour does phenolphthalein indicator turn when added to an alkali (such as sodium hydroxide)?
A white shirt has a yellow stain of curry. When soap is rubbed on this shirt during washing, the yellow stain turns reddish-brown. On rinsing the shirt with plenty of water, the reddish-brown stain turns yellow again.
Explain the changes in colour of this indicator which take place during washing and rinsing the shirt.
Write the neutralisation reaction between acids and bases in terms of the ions involved.
What happens when bases react with non-metal oxides? Explain with the help of an example. What does this reaction tell us about the nature of non-metal oxides?
The salt which will give an acidic solution on dissolving in water is ______.
What is the difference between an alkali and a base?
What is the difference between an alkali and a metal hydroxide?
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 | -- | -- | |
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).
Solution A is strong acid B weak acid C strong alkali.
Which solution contains solute molecules in addition to water molecules?
Name the positive ion formed When an acid is dissolved in water.
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?
Which of the following statements is true for acids?
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?
Complete the following equation.
Ca(OH)2 + ______ → ______ + H2O
