Advertisements
Advertisements
प्रश्न
Fill in the blank in the following sentences:
Onion and vanilla extract are..........................indicators.
उत्तर
Onion and vanilla extract are olfactory indicators.
APPEARS IN
संबंधित प्रश्न
Is the distilled water acidic/basic/neutral? How would you verify it?
Fill in the following blank with suitable words:
Neutral substances have a pH of ................
Explain the pH change as the cause of tooth decay. How can tooth decay caused by pH change be prevented?
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
Which of the following elements would from oxides which would indicate pH values less than seven, using moist pH paper?
Magnesium, Carbon, Sulphur, Hydrogen, Copper
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 |
A group of students measured the pH of some substances they found in their homes. Their results are given in the following table:
| Substance | pH | Substance | pH |
| Apples | 3.0 | Salt | 7.0 |
| Baking soda | 8.5 | Sugar | 7.0 |
| Black coffee | 5.0 | Toothpaste | 9.0 |
| Household ammonia | 12.0 | Vinegar | 3.0 |
| Lemon juice | 2.5 | Washing soda | 11.5 |
| Milk | 6.5 |
(a) What would the students have used to measure the pH?
(b) Which solution is the most acidic?
(c) Which solution is the most alkaline?
(d) Which solutions are neutral?
(e) Which solution can be used to treat wasp stings?
(f) Which solutions can be used to treat bee stings?
Hibiscus flower is an example for natural indicator.
Which one of the following can be used as an acid- base indicator by a visually impared student?
Write a note on:
Methyl orange
