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प्रश्न
In basic solution turmeric indicator paper changes from yellow to _______.
विकल्प
blue
green
yellow
red
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उत्तर
In basic solution turmeric indicator paper changes from yellow to red.
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संबंधित प्रश्न
What is the pH of a neutral solution?
Which is more acidic : a solution of pH = 2 or a solution of pH = 6?
What colour will universal indicator show if you add it to the following substances?
(a) potassium hydroxide, pH = 12
(b) soda water, pH = 5
(c) sulphuric acid, pH = 2
Water is a neutral substance. What colour will you get when you add a few drops of universal indicator to a test-tube containing water?
Name two common antacids.
A solution turns phenolphthalein indicator pink. The most likely pH of this solution will be:
(a) 6
(b) 4
(c) 9
(d) 7
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).
How could the person change his eating habits to lessen chances of suffering from tooth decay?
Hibiscus flower is an example for natural indicator.
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.)
