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प्रश्न
State one observation for each of the following :
A small piece of zinc is added to dilute hydrochloric acid
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उत्तर
Bubbles of H2 gas observed.
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संबंधित प्रश्न
Name one natural source of the following acid:
Citric acid
What colour does phenolphthalein indicator turn when added to an alkali (such as sodium hydroxide)?
Name a sodium compound which is a constituent of many dry soap powders.
Name the acid present in vinegar.
Name an acid used as an eyewash.
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).
Most of the acids are not soluble in water.
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.
Lemon water is basic in nature.
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?
