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प्रश्न
Mention the colour changes observed when the following indicators are added:
| Solution | Acids | Alkalies |
| (a) Alkaline phenolphthalein solution | ||
| (b) Methyl orange solution | ||
| (c) Neutral litmus solution |
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उत्तर
| Solution | Acids | Alkalies |
| (a) Alkaline phenolphthalein solution | Remains Colourless | Colourless to pink |
| (b) Methyl orange solution | Orange to pink | Orange to yellow |
| (c) Neutral litmus solution | Blue to Red | Red to Blue |
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संबंधित प्रश्न
How would you obtain salt from another salt?
How is the following salt prepared:
Sodium nitrate from sodium hydroxide.
You are provided with the following chemicals:
NaOH, Na2CO3, H2O, Zn(OH)2, CO2, HCI, Fe, H2SO4, CI2, Zn.
Using the suitable chemicals from the given list only, state briefly how you would prepare iron (III) chloride.
State how would you prepare copper (II) oxide from
Copper nitrate
State how would you prepare copper (II) oxide from
Copper Carbonate
Choosing the correct words given in brackets, complete the sentence given below: Copper sulphate from copper.
State the inference drawn from the following observation:
Salt S is prepared by reacting dilute sulphuric acid with copper oxide Identify S.
For each of the salt: A, B, C and D, suggest a suitable method of its preparation.
- A is a sodium salt.
- B is an insoluble salt.
- C is a soluble salt of copper.
- D is a soluble salt of zinc.
The following is a list of methods for the preparation of salts.
A – direct combination of two elements.
B – reaction of a dilute acid with a metal.
C – reaction of a dilute acid with an insoluble base.
D – titration of a dilute acid with a solution of soluble base.
E – reaction of two solutions of salts to form a precipitate.
Choose from the above list A to E, the best method of preparing the following salt by giving a suitable equation in the following case:
Copper sulphate.
Select the word/s given which are required to correctly complete the blanks.
If a piece of magnesium was put into a solution M, ______ gas would be evolved.
