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प्रश्न
Write any two important uses of bases.
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उत्तर
- Sodium hydroxide is used in the manufacture of soap, paper and a synthetic fibre called rayon.
- Calcium hydroxide (called slaked lime) is used in the manufacture of bleaching powder.
- Magnesium hydroxide is used as an antacid to neutralise excess stomach acid and relieve indigestion.
- Sodium carbonate is used as washing soda and for softening hard water.
- Sodium hydrogencarbonate is used as baking soda in cooking, in baking powders, as an antacid to treat indigestion, and in soda-acid fire extinguishers.
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संबंधित प्रश्न
What is meant by strong acids?
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.
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Write the neutralisation reaction between acids and bases in terms of the ions involved.
Name the acid present in vinegar.
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\[\ce{Acid + Sulphite or bisulphite -> Salt + water + sulphur dioxide}\]
Table salt is acidic.
Acid mixed with base forms ______.
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Two acids ‘A’ and ‘B’ are given. Acid A gives one hydrogen ion per molecule of the acid in solution. Acid B gives two hydrogen ions per molecule of the acid in solution.
- Find out acid A and acid B.
- Which acid is called the King of Chemicals?
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.
Which of the following is acidic in nature?
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 | ______ |
Lemon juice and vinegar taste ______ because they contain ______.
Hydrochloric Acid reacts with metal bicarbonates to give ______.
To Interpret:
CH4 and NH3, are not acids.
Exlain the following:
\[\ce{H3PO3}\] is not 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.
In a set of the given reactions, acetic acid yielded a product C.
\[\begin{array}{cc}
\phantom{}\ce{\underset{}{CH3COOH + PCl5} ->[][ ] \underset{}{A}->[C6H6][anhy.AlCl3 ] \underset{}{B}->[C2H5MgBr][Ether] \underset{}{C}}\\
\end{array}\]
Product C would be:
