Advertisements
Advertisements
प्रश्न
| Column A | Column B | ||
| i | eosin | 1 | losing hydrogen |
| ii | oxidation | 2 | synthetic indicator |
| 3 | losing oxygen | ||
| 4 | natural indicator |
Advertisements
उत्तर
| Column A | Answers | ||
| i | eosin | 2 | synthetic indicator |
| ii | oxidation | 1 | losing hydrogen |
APPEARS IN
संबंधित प्रश्न
What do we observe on pouring acetic acid on red and blue litmus papers?
(A) Red litmus remains red and blue litmus turns red.
(B) Red litmus turns blue and blue litmus remains blue.
(C) Red litmus turns blue and blue litmus turns red.
(D) Red litmus becomes colourless and blue litmus remains blue.
A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains ______.
Name one natural source of the following acid:
Lactic acid
Substances do not show their acidic properties without ______.
What happens when an acid reacts with a metal? Give the chemical equation of the reaction involved.
What happens when an acid reacts with a metal oxide? Explain with the help of an example. Write a balanced equation for the reaction involved.
Which element is common to all acids?
A solution reacts with zinc granules to give a gas which burns with a 'pop' sound. The solution contains:
(a) Mg(OH)2
(b) Na2CO3
(c) NaCl
(d) HCl
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.
What ions are present in the solutions of following substances? (write the symbols only)
Nitric acid
What ions are present in the solutions of following substances? (write the symbols only)
Magnesium hydroxide
What is the chemical formula of baking soda?
Phenolphthalein is a synthetic type of indicator.
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?
Which of the following statements is not correct?
In the following schematic diagram for the preparation of hydrogen gas as shown in the figure, what would happen if following changes are made?
- In place of zinc granules, same amount of zinc dust is taken in the test tube
- Instead of dilute sulphuric acid, dilute hydrochloric acid is taken
- In place of zinc, copper turnings are taken
- Sodium hydroxide is taken in place of dilute sulphuric acid and the tube is heated.
A sulphate salt of Group 2 element of the Periodic Table is a white, soft substance which can be moulded into different shapes by making its dough. When this compound is left in open for some time, it becomes a solid mass and cannot be used for moulding purposes. Identify the sulphate salt. Why does it show such a behaviour? Give the reaction involved.
The taste of acid is ______.
Write notes on the properties of acids.
Consider the following salt:
\[\ce{ZCO3}\]
What would be the change in colour in blue litmus if \[\ce{ZCO3}\] is added to it and Z is potassium?
