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प्रश्न
Name the source from which litmus solution is obtained. What is the use of this solution?
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उत्तर
Litmus solution is derived from lichens and serves as an indicator. When removed, it appears bright purple. It turns blue when added to bases but red when introduced to acids.
It is used as an indicator to distinguish between acids and bases.
| Solution | Colour of the litmus solution |
| Acidic | Red |
| Basic | Blue |
| Neutral | No change |
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संबंधित प्रश्न
What type of ions is formed when an acid is dissolved in water?
The salt which will give a neutral solution on dissolving in water will be:
(a) CH3COONa
(b) NH4Cl
(c) KCl
(d) Na2CO3
Consider the following substances:
NaCl, Ca(OH)2, NaHCO3, NH3, Na2CO3, H2O, Cl2, CO2, CaSO4.2H2O, 2CaSO4.H2O, CaOCl2
Which compound is used as an antacid?
Explian the following:
Dil. HCl acid is stronger than highly concentrated acetic acid.
Classify the following solutions as acids, bases or salts.
Ammonium hydroxide, barium chloride, sodium chloride, sodium hydroxide, H2SO4 and HNO3
Match the pairs.
| Group A | Group B |
| 1. Tamarind | a. Acetic acid |
| 2. Curd | b. Citric acid |
| 3. Lemon | c. Tartaric acid |
| 4. Vinegar | d. Lactic acid |
Solution A is strong acid B weak acid C strong alkali.
Which solution contains solute molecules in addition to water molecules?
The preparation of Lead sulphate from Lead carbonate is a two-step process. (Lead sulphate cannot be prepared by adding dilute Sulphuric acid to Lead carbonate.)
Write the equation for the reaction that will take place when this first step is carried out.
What are the uses of acids?
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 |
