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प्रश्न
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?
उत्तर १
Since this milk is slightly more basic than usual milk, the acids produced to set the curd are neutralized by the base. Therefore, it takes a longer time for the curd to set.
उत्तर २
The milkman made the milk alkaline by adding baking soda. The alkaline medium slows down the transformation of the milk into curd. The lactic acid produced undergoes neutralisation, so the milk takes a long time to set as curd.
संबंधित प्रश्न
Indicator is a substance which shows different colours in acidic and basic solutions.
- 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 is an indicator? Name three common indicators.
The property which is common between vinegar and curd is that they:
(a) have sweet taste
(b) have bitter taste
(c) are tasteless
(d) have sour taste
What is the name of the indicator which can be used for testing the pH of a solution?
What colour would the universal indicator show in an aqueous solution of sugar? Why?
How does an antacid work?
Fresh milk has a pH of 6. When milk changes into curd, the pH value will:
(a) become 7
(b) become less than 6
(c) become more than 7
(d) remain unchanged
The pH values of five solutions A, B, C, D and E are given below:
| A | 1 |
| B | 5 |
| C | 7 |
| D | 11 |
| E | 13 |
The pH values of five solutions A, B, C, D and E are given below:
| A | 1 |
| B | 5 |
| C | 7 |
| D | 11 |
| E | 13 |
How will you prepare natural indicator from turmeric powder?
A student prepares solutions of (i) an acid and (ii) a base in two separate beakers. She forgot to label the solutions and litmus paper is not available in the laboratory. Since both the solutions are colourless, how will she distinguish between the two?
Turmeric and litmus are _________ acid-base indicators.
Acids and bases can be identified in the laboratory by ______.
What is the colour of phenolphthalein in the basic solution?
Name any two synthetic acid-base indicators.
Take some lemon juice in a tumbler and add baking soda slowly. What do you see? What do you infer from this?
Take a shirt with turmeric powder strain. Wash the shirt with soap. Do you observe any change in the colour? Why?
Few drops of aqueous solution of ammonium chloride are put on a universal indicator paper. The paper turns pink.
Choose the correct option.
