Chemistry
Grade-10
Easy
Question
On the pH scale higher numbers indicate
- Acids
- Bases
- Neither acids or bases
- Both acids and bases
Hint:
On the pH scale, higher numbers indicate bases.
The correct answer is: Bases
- The pH scale determines the acidity and basicity of a substance. The range is 0 to 14, with 7 representing neutrality.
- Acidity is indicated by pH values below 7, whereas baseness is shown by pH values above 7.
- In reality, pH is a measurement of the proportion of free hydrogen and hydroxyl ions in water.
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Shreya took some turmeric powder and made a paste by adding some water. She cut the strips of paper and applied this turmeric paste on them. After drying this strip, she put a few drops of some sample solution on each.
What would be the change in color of strips, she observed?
(i) Salt solution
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Which of the following is correctly matched?
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Acid |
| (a) Litmus |
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| (b) China rose |
Orange |
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Red |
| (d) Red Cabbage |
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Which of the following is correctly matched?
| Indicators |
Acid |
| (a) Litmus |
Blue |
| (b) China rose |
Orange |
| (c) Methyl orange |
Red |
| (d) Red Cabbage |
Red |
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A China rose indicator, when added to a sample solution, its color changes to green. What will be the nature of this sample?
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Red cabbage is a natural indicator. When it is added to the basic solution, the color changes from:
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The following figure shows the color changes in the test tubes A, B and C after adding indicator China rose.
Identify the solution present in test tubes A, B and C, respectively?
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Identify the solution present in test tubes A, B and C, respectively?
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