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प्रश्न
Write the observation, and balanced equation for the following reaction:
Moist starch iodide paper is placed at the mouth of a test tube containing chlorine gas.
उत्तर
Starch paper turns blue black :
\[\ce{2KI + Cl2 -> 2KCI + I2}\]
I2 reacts with starch to give blue black colour.
The chlorine liberates iodine from KI and then it is decolourised.
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संबंधित प्रश्न
Write the probable colour of the following salt:
Ammonium salts
Write the probable colour of the following salt:
Aluminium Salts
Write the probable colour of the following salts:
Calcium carbonate
Write the colour of the following salts: Cuprous salts.
Write the colour of the following salt : Ferric salts.
One chemical test that would enable you to distinguish between the following pair of chemicals. Describe what happens with each chemical or state 'no visible reaction'.
Write balanced equation for the following reaction:
Iron(II) chloride solution with sodium hydroxide solution.
The questions (i) to (v) refer to the following salt solutions listed A to F:
- Copper nitrate
- Iron (II) sulphate
- Iron (III) chloride
- Lead nitrate
- Magnesium sulphate
- Zinc chloride
- Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution?
- Which two solutions will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution ?
- Which solution will give a white precipitate, when either dilute hydrochloric acid or dilute sulphuric acid is added to it?
- Which solution becomes a deep/inky blue colour when excess of ammonium hydroxide is added to it ?
- Which solution gives a white precipitate with excess ammonium hydroxide solution?
Name the probable cation present based on the following observation:
White precipitate insoluble in NH4OH but soluble in NaOH.
| Abhishek was given a salt 'X' which was white in colour for analysis. On strong heating, it produced a yellow residue, a colourless gas and also a reddish-brown gas. The solution of the salt 'X', when tested with an excess of ammonium hydroxide, produced a chalky white insoluble precipitate. |
- Name the coloured gas that evolved when Abhishek heated the salt strongly.
- Which cation was present in the sample given to Abhishek?
- Identify the salt given to Abhishek for analysis.
