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प्रश्न
You have been provided with three test-bubes. One of these test-tubes contains distilled water and the other two contain an acidic and a basic solution respectively. If you are given only blue litmus paper, how will you identify the contents of each test-tube?
उत्तर
We have been provided with three test tubes, containing distilled water, an acidic solution and a basic solution. The test tube containing distilled water will not bring about any change in the colour of the blue litmus paper. Now, when you dip the same litmus paper in the test tube containing the acidic solution, it will turn the blue colour of the litmus paper to red. The basic solution in the third test tube will have no effect on blue litmus paper but will revert back the colour of litmus paper to blue which was earlier turned red by the acidic solution.
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संबंधित प्रश्न
Lime water turns milky when __________ gas is passed through it.
(a) H2
(b) CO
(c) CO2
(d) SO2
What colour do the following indicators turn when added to a base or alkali (such as sodium hydroxide)?
red cabbage extract
What colours do the following indicators turn when added to an acid (such as hydrochloric acid)?
methyl orange
What happens when dilute hydrochloric acid is added to sodium carbonate? Write a balanced chemical equation of the reaction involved.
Which gas is liberated when dilute hydrochloric acid reacts with sodium carbonate?
Explain with an example. Give the chemical equation of the reaction which takes place.
What happens when carbon dioxide gas is passed through lime water for a considerable time ?
Write equations of the reactions involved.
Write the main difference between an acid and a base.
Vinay observed that the stain of curry on a white shirt becomes reddish-brown when soap is scrubbed on it, but it turns yellow again when the shirt is washed with plenty of water. What might be the reason for his observation?
- Soap is acidic in nature
- Soap is basic in nature
- Turmeric is a natural indicator which gives reddish tinge in bases
- Turmeric is a natural indicator which gives reddish tinge in acids
Salt A commonly used in bakery products on heating gets converted into another salt B which itself is used for the removal of hardness of water and a gas C is evolved. The gas C when passed through lime water, turns it milky. Identify A, B and C.
