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प्रश्न
From which plant is litmus paper or litmus solution obtained?
- Moss
- Rose
- Hibiscus
- Lichen
उत्तर
(d) Lichen.
Litmus is a water soluble mixture of different dyes extracted from lichens, especially Roccella tinctoria.
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संबंधित प्रश्न
| Column A | Column B | ||
| i | eosin | 1 | losing hydrogen |
| ii | oxidation | 2 | synthetic indicator |
| 3 | losing oxygen | ||
| 4 | natural indicator |
Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.
Dry HCl gas does not change the colour of dry blue litmus paper. Why?
Write a word equation and then a balanced equation for the reaction taking place when:
Dilute hydrochloric acid reacts with magnesium ribbon.
Write a word equation and then a balanced equation for the reaction taking place when:
Dilute sulphuric acid reacts with aluminium powder.
What happens when an acid reacts with a base?
What happens when an acid reacts with a metal carbonate? Explain with the help of an example. Write chemical equation of the reaction involved.
On adding dilute hydrochloric acid to copper oxide powder, the solution formed is blue-green.
Predict the new compound formed which imparts a blue-green colour to solution.
What happens when a solution of sodium hydrogencarbonate is heated? Write equation of the reaction involved.
State two uses each of the following compounds:
Hydrochloric acid
Phenolphthalein is a synthetic type of indicator.
Write any four physical properties of acids.
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?
In an attempt to demonstrate electrical conductivity through an electrolyte, the apparatus setup. Which among the following statement(s) is(are) correct?
- Bulb will not glow because electrolyte is not acidic
- Bulb will glow because NaOH is a strong base and furnishes ions for conduction.
- Bulb will not glow because circuit is incomplete
- Bulb will not glow because it depends upon the type of electrolytic solution
Which of the following are present in a dilute aqueous solution of hydrochloric acid?
What happens when nitric acid is added to egg shell?
Acids present in fruits and vegetables are called ______ acids.
What property do acids and bases have in common? Explain it with an example.
The metal that will not produce hydrogen gas when reacted with dilute acids.
Give a balanced equation for the reaction:
Silver nitrate solution and sodium chloride solution.
