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प्रश्न
Name an indicator which is pink in alkaline solution but turns colourless in acidic solution.
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उत्तर
Phenolphthalein
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संबंधित प्रश्न
Name one natural source of the following acid:
Oxalic acid
What colour does phenolphthalein indicator turn when added to an alkali (such as sodium hydroxide)?
- What do you understand by the term, acid?
- Name the positive ion formed when an acid is dissolved in water.
- Draw the structure of this ion.
Name the acid present in vinegar.
Name an acid used to flavor and preserve food.
Sulphuric acid has the highest importance in the chemical industry. Why?
Give the name and formula of two : Strong monobasic acids
Define a base.
An hydrous hydrogen chloride is not an acid but its aqueous solution is a strong acid. Explain.
What do you understand by the strength of an acid? On what factors does the strength of an acid depend?
Choose the correct answer from the options given below
Which of them occurs in solid state?
HCl, HNO3, C2H5OH, C6H12O6 all contain H atoms but only HCl and HNO3 show acidic character. Why?
What are the uses of acids?
Since metal carbonate and metal bicarbonate are basic, they react with acids to give salt and water with the liberation of ______.
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.
Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed
What are acids?
______ contain one or more replaceable hydrogen atoms.
Complete the following equation.
Na2CO3 + 2HCl → ______ + ______ + CO2↑
Which one of the following will not produce an acid when made to react with water.
