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प्रश्न
From which plant is litmus paper or litmus solution obtained?
- Moss
- Rose
- Hibiscus
- Lichen
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उत्तर
(d) Lichen.
Litmus is a water soluble mixture of different dyes extracted from lichens, especially Roccella tinctoria.
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संबंधित प्रश्न
Dilute NaOH can be tested with
(a) red litmus paper
(b) blue litmus paper
(c) lime water
(d) Na2CO3
When acids react with metal, which gas is liberated?
What happens when an acid reacts with a base? Explain by taking the example of hydrochloric acid and sodium hydroxide. Give equation of the chemical reaction which takes place. What is the special name of such a reaction?
What is a neutralisation reaction? Explain with an example. Give the chemical equation of the reaction which takes place.
Compounds such as alcohol and glucose also contain hydrogen but are not categorised as acids. Describe an activity to prove it.
A solution reacts with zinc granules to give a gas which burns with a ‘pop’ sound. The solution contains ______.
On adding dilute hydrochloric acid to copper oxide powder, the solution formed is blue-green.
On the basis of the above reaction, what can you say about the nature of copper oxide?
Name the gas evolved when zinc granules are treated/heated with:
Hydrochloric acid solution
What ions are present in the solution of the following substance? (write the symbols only)
Potassium hydroxide
Wasp stings can be treated with ______.
State the common and chemical names of the compound formed when plaster of Paris is mixed with water.
When _______________ is passed through fresh lime water, it turns milky.
A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue?
Common salt besides being used in kitchen can also be used as the raw material for making
- washing soda
- bleaching powder
- baking soda
- slaked lime
Which of the following statements is not correct?
The formula of bleaching powder is ______.
A substance 'X' is used as a building material and is insoluble in water. When it reacts with dil. HCl, it produces a gas which turns lime water milky.
- Write the chemical name and formula of 'X'.
- Write chemical equations for the chemical reactions involved in the above statements.
Consider the following salt:
\[\ce{ZCO3}\]
What would be the change in colour in blue litmus if \[\ce{ZCO3}\] is added to it and Z is potassium?
