Advertisements
Advertisements
प्रश्न
The aqueous solution of one of the following salts will turn red litmus to blue. This salt is:
विकल्प
potassium sulphate
sodium sulphate
sodium chloride
potassium carbonate
Advertisements
उत्तर
Potassium carbonate
Explanation:
Turning red litmus to blue requires a basic or alkaline solution. Potassium carbonate (K2CO3) is a basic salt formed from a strong base (KOH) and a weak acid (H2CO3). When dissolved in water, carbonate ions undergo anionic hydrolysis, releasing excess hydroxide ions (OH−), thereby raising the pH above 7 and turning red litmus paper blue.
APPEARS IN
संबंधित प्रश्न
Why is sodium chloride required in our body?
Name three chemicals made from common salt (or sodium chloride).
Explain why chlorine is used for sterilising drinking water supply.
The aqueous solution of one of the following salts will turn phenolphthalein indicator pink. This salt is:
Give one example of a salt which gives an aqueous solution having:
pH equal to 7
Give one example of a salt which gives an aqueous solution having:
pH more than 7
Write the name and formula of one salt which contains:
Two molecules of water of crystallisation.
Name a salt whose solubility decreases with temperature.
name two salts which are basic.
Hard water required for an experiment is not available in a school laboratory. However, following salts are available in the laboratory. Select the salts which may be dissolved in water to make it hard for the experiment.
|
(1) |
Calcium Sulphate |
(2) |
Sodium Sulphate |
|
(3) |
Calcium Chloride |
(4) |
Potassium Sulphate |
|
(5) |
Sodium Hydrogen Carbonate |
(6) |
Magnesium Chloride |
(A) 1, 2 and 4
(B) 1, 3 and 6
(C) 3, 5 and 6
(D) 2, 4 and 5
Outline the steps required to convert hydrogen chloride to anhydrous iron (III) chloride. Write the equations for the reactions.
State what would you observe when :
Washing soda crystals are exposed to the atmosphere.
Copy and complete the following table which refers to the action of heat on some carbonates:
| Carbonate | Colour of residue on cooling |
| Zinc Carbonate | |
| Lead carbonate | |
| Copper carbonate |
Identify the following substance:
Gas C has an offensive smell like rotten eggs.
Acids react with metallic oxides to produce ______.
What are hygroscopic substances?
An aqueous solution of a salt turns blue litmus to red. The salt could be the one obtained by the reaction of ______.
You are provided with the list of chemicals mentioned below in the box:
| Sodium hydroxide solution, copper carbonate, zinc, hydrochloric acid, copper, dilute sulphuric acid, chlorine, iron |
Using suitable chemicals from the list given, write a balanced chemical equation for the preparation of the salt mentioned below:
Sodium zincate
Select the correct answer from A, B, C, D and E.
A compound which in the aqueous solution state, is neutral in nature.
