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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?
पर्याय
All four
a and d
b, c and d
Only d
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उत्तर
Only d
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संबंधित प्रश्न
What colour does the following indicator turn when added to an acid (such as hydrochloric acid)?
Litmus
Why should curd and other sour foodstuffs (like lemon juice, etc.) not be kept in metal containers (such as copper and brass vessels)?
Two solutions A and B have pH values of 3.0 and 9.5 respectively. Which of these will turn litmus solution from blue to red and which will turn phenolphthalein from colourless to pink?
Explain the pH change as the cause of tooth decay.
The pH values of six solutions A to F are given below:
A = 0, B = 11, C = 6, D = 3, E = 13, F = 8
Which of the above solutions are
- acids
- alkalis?
Name two common antacids.
Which of the following is not a natural indicator?
Take a shirt with turmeric powder strain. Wash the shirt with soap. Do you observe any change in the colour? Why?
A milkman adds a very small amount of baking soda to fresh milk. Why does this milk take a long time to set as curd?
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.)
