Question

practical chemistry​

Answer 1

Answer:

1)- carbon dioxide (CO2) and hydrogen sulphide (H2S)

2)- calcium hydroxide reacts with carbon dioxide to form a white precipitate, calcium carbonate, and water. Carbon dioxide dissolves in water to produce carbonic acid,The carbonic acid reacts with OH- to produce the carbonate ion that precipitates with calcium ion.

3)- Sulphur dioxide gas changes acidifed Potassium Dichromate solution from orange to green.

Chemical reaction: Sulphur dioxide reacts with acidified potassium Dichromate solution to give Chromium Sulphate , Poatssium sulphate and water.

4)- Chlorine is a greenish yellow gas at room temperature

5)- Chlorine turns moist starch iodide paper blue-black because the iodide ions on the paper are oxidised to iodine and the starch react to it to give blue-black compound.

Explanation:

I had written reaction in words because it was not correctly written by mobile phone keyboard

so you can write it by itself

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