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प्रश्न
| Column A | Column B | ||
| i | eosin | 1 | losing hydrogen |
| ii | oxidation | 2 | synthetic indicator |
| 3 | losing oxygen | ||
| 4 | natural indicator |
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उत्तर
| Column A | Answers | ||
| i | eosin | 2 | synthetic indicator |
| ii | oxidation | 1 | losing hydrogen |
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संबंधित प्रश्न
When phenolphthalein is added to NaOH, the colour of the solution will become _________.
- colourless
- red
- pink
- yellow
Complete and balance the following chemical equation:
\[\ce{NaOH_{(aq)} + HCl_{(aq)} ->}\]
Substances do not show their acidic properties without ______.
On adding dilute hydrochloric acid to copper oxide powder, the solution formed is blue-green.
- Predict the new compound formed which imparts a blue-green colour to solution.
- Write a balanced chemical equation of the reaction which takes place.
- On the basis of the above reaction, what can you say about the nature of copper oxide?
A substance X which is used as an antacid reacts with dilute hydrochloric acid to produce a gas Y which is used in one type of fire-extinguisher. Name the substance X and gas Y. Write a balanced equation for the chemical reaction which takes place.
Wasp stings can be treated with ______.
Hydrochloric acid reacts with a metal X to form a gas Y which burns with a ‘pop’ sound. Sodium hydroxide solution also reacts with the same metal X (on heating) to form the same gas Y.
- Name X and Y.
- Write the chemical equation of the reaction of metal X with
- hydrochloric acid, and
- sodium hydroxide solution.
What is the chemical formula of bleaching powder?
Magnesium hydroxides are used for treating _______
A solution of NaCl
(i) will turn red litmus blue
(ii) will turn pH paper green
(iii) will turn blue litmus red
(iv) will not affect litmus
The table given below shows the reaction of a few elements with acids and bases to evolve Hydrogen gas.
| Element | Acid | Base |
| A |
✗
|
✗ |
| B |
✓
|
✓ |
| C | ✓ | ✗ |
| D | ✓ | ✓ |
Which of these elements form amphoteric oxides?
A student added 10 g of calcium carbonate in a rigid container, secured it tightly and started to heat it. After some time, an increase in pressure was observed, the pressure reading was then noted at intervals of 5 mins and plotted against time, in a graph as shown below. During which time interval did maximum decomposition take place?
Which of the following gives the correct increasing order of acidic strength?
Common salt besides being used in kitchen can also be used as the raw material for making
- washing soda
- bleaching powder
- baking soda
- slaked lime
What are strong and weak acids? In the following list of acids, separate strong acids from weak acids.
Hydrochloric acid, citric acid, acetic acid, nitric acid, formic acid, sulphuric acid.
Vinegar is ______ in taste.
______ & ______ metals do not react with HCl or HNO3.
The taste of acid is ______.
On placing a copper coin in a test tube containing green ferrous sulphate solution, it will be observed that the ferrous sulphate solution ______.
What property do acids and bases have in common? Explain it with an example.
