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प्रश्न
How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal?
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उत्तर
- Bring a burning matchstick or a candle near the mouth of the test tube where the gas is escaping.
- The gas will burn with a characteristic ‘pop’ sound, which confirms the presence of hydrogen gas.
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संबंधित प्रश्न
Name an indicator which is pink in alkaline solution but turns colourless in acidic solution.
Name the gas evolved when dilute HCl reacts with sodium hydrogencarbonate. How is it recognised?
Name one natural source of the following acid:
Oxalic acid
What type of ions are formed?
When an acid is dissolved in water.
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?
Define the term ‘basicity’ of an acid.
Give two examples of the following:
oxy-acid
What is the difference between an alkali and a base?
Write balanced equation to satisfy the following statement:
\[\ce{Acid + Base -> Salt + water}\]
Write balanced equation to satisfy the following statement:
\[\ce{Acid + Sulphite or bisulphite -> Salt + water + sulphur dioxide}\]
Write balanced equation to satisfy the following statement:
\[\ce{Acid + sulphide -> Salt + Hydrogen sulphide}\]
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 | -- | -- | |
Define an acid.
An hydrous hydrogen chloride is not an acid but its aqueous solution is a strong acid. Explain.
Which of the following statements is true for acids?
The correct way of making a solution of acid in water is to ______.
Which of the following metal does not react with sodium hydroxides?
Non-metallic oxides are ______ in nature.
Explain the following:
H3PO3 is not a tribasic acid.
Bring the soil sample of your area, find out if it is acidic, basic or neutral. Discuss with farmers if they treat the soil in any manner.
