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Question
Which are the industrial uses of acids?
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Solution
Industrial uses of acid are:
- Sulphuric acid is used in manufacturing fertilizers such as superphosphate, ammonium sulphate etc.
- Sulphuric acid is used in the manufacture of dyes.
- Nitric acid is used in the manufacture of paints.
- Sulphuric acid is used in the manufacture of drugs.
- Sulphuric acid is used in the manufacture of explosives.
- Sulphuric acid is used in batteries, which is used in cars etc.
- Tannic acid is used in the manufacture of ink and leather.
- Hydrochloric acid is used for making aqua regia, which is used to dissolve noble metals such as gold and platinum.
- Sulphuric acid is used in the manufacture of jet fuel, kerosene and leather.
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Name the natural indicator present in curry stain.
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monobasic acid
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Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?
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 |
______ |
|
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Salt + ______ + ______ |
Decomposition of carbonate |
|
Chlorides/nitrates + Acid (conc.) |
______ + ______ |
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Which of the following is not a mineral acid?
Match the chemical substances given in Column (A) with their appropriate application given in Column (B)
| Column (A) |
Column (B) |
| (A) Bleaching powder | (i) Preparation of glass |
| (B) Baking soda | (ii) Production of H2 and Cl2 |
| (C) Washing Soda | (iii) Decolourisation |
| (D) Sodium chloride | (iv) Antacid |
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 |
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?
