practical chemistry
Answers
Answer:
Answer no 1
The most common types of acid gas are carbon dioxide (CO2) and hydrogen sulphide (H2S), though there are many other varieties as well, including hydrogen chloride (HCI), hydrogen fluoride (HF), sulphur oxides (SO2 and SO3) and nitrogen oxides (NOx).
Answer no 2
Answer: When calcium hydroxide reacts with carbon dioxide, it produces calcium carbonate and water. In this reaction, when carbon dioxide gas reacts with slaked lime called calcium hydroxide, the solution becomes milky due to the formation of calcium carbonate and calcium carbonate is insoluble in water.
Answer no 3
Sulfur dioxide react with potassium dichromate and sulfuric acid
SO
2
+K
2
Cr
2
O
7
+3H
2
SO
4
→K
2
SO
4
+Cr
2
(SO
4
)
3
+3H
2
O
Sulfur dioxide react with potassium dichromate and sulfuric acid to produce potassium sulfate, chromium(III) sulfate and water and the solution turns from orange to green.
Answer no 4
yellow gas
Chlorine is a greenish-yellow gas. As we go down the group, the colour of halogens gets darker. Fluorine is pale-yellow in colour, chlorine is greenish-yellow.
Answer no 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.