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प्रश्न
Indicator is a substance which shows different colours in acidic and basic solutions.
पर्याय
True
False
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उत्तर
This statement is True.
Explanation:
An indicator is a substance that changes colour when added to acidic or basic solutions, allowing us to determine the pH level of the solution.
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संबंधित प्रश्न
- Both acids and bases change colour of all indicators.
- If an indicator gives a colour change with an acid, it does not give a change with a base.
- If an indicator changes colour with a base, it does not change colour with an acid.
- Change of colour in an acid and a base depends on the type of the indicator.
Which of these statements are correct?
What colour does the following indicator turn when added to a base or alkali (such as sodium hydroxide)?
Litmus
What colour will the universal indicator show if you add it to the following substance?
Potassium hydroxide, pH = 12
Two drinks P and Q gave acidic and alkaline reactions, respectively. One has a pH value of 9 and the other has a pH value of 3. Which drink has the pH value of 9?
What colour would the universal indicator show in an aqueous solution of sugar? Why?
Here are some results of solutions tested with universal indicator paper:
| Sulphuric acid | : Red |
| Metal polish | : Dark blue |
| Washing-up liquid | : Yellow |
| Milk of magnesia | : Light blue |
| Oven cleaner | : Purple |
| Car batter acid | : Pink |
Arrange the solutions in order of their increasing pH value (starting with the one with the lowest pH).
The salt whose aqueous solution will turn blue litmus to red is:
(a) ammonium sulphate
(b) sodium acetate
(c) sodium chloride
(d) potassium carbonate
In acidic solution, the colour of the hibiscus indicator paper will change to _____.
What is the colour of phenolphthalein in the basic solution?
Using the knowledge of acids and bases, write a secret message with the help of baking soda and beet root. Explain how it works.
(Hint: Prepare baking soda solution in water. Use this solution to write the message on a sheet of white paper with a cotton bud. Rub a slice of fresh beetroot over the message.)
