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प्रश्न
Name an indicator which is pink in alkaline solution but turns colourless in acidic solution.
उत्तर
Phenolphthalein is pink in an alkaline solution but turns colourless in an acidic solution.
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संबंधित प्रश्न
Name the acid-base indicator extracted from lichen.
When a piece of limestone reacts with dilute HCl, a gas X is produced. When gas X is passed through lime water then a white precipitate Y is formed. On passing excess of gas X, the white precipitate dissolves forming a soluble compound Z.
- What are X, Y and Z?
- Write equations for the reactions which take place:
- When limestone reacts with dilute HCl.
- When gas X reacts with lime water to form white precipitate Y.
- When excess of gas X dissolves white precipitate Y to form a soluble compound Z.
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.
Name the natural indicator present in curry stain.
The acid produced naturally in our stomach is:
(a) acetic acid
(b) citric acid
(c) hydrochloric acid
(d) sulphuric acid
Define a base.
Explain, all alkalis are bases but all bases are not alkalis.
An hydrous hydrogen chloride is not an acid but its aqueous solution is a strong acid. Explain.
Choose the correct answer from the options given below:
Benzoic acid is used for/in/as
You are provided with four test tubes containing sugar solution, baking soda solution, tamarind solution, and salt solution. Write down the activity to find the nature (acidic/basic/neutral) of each solution.
Exlain the following:
\[\ce{H3PO3}\] is not tribasic acid.
