Question

1 .Can oxidation occur without reduction?
2 .What is the chemical formula of rust?
3 .Give two examples of weak acids.
4 .Give one example of decomposition which is useful in photography,
5 .Give one example of double displacement reaction.
6 .Identify the compound which is oxidized in the following reaction
H₂S+ Brz
----> 2HBr + S
7 .Which acid constitutes vinegar?
8 .What are alkalies?
9 .Give an example of precipitation reaction.​

Answer 1

Answer:

1. No

2. Fe2O3.32H2O

3. HO2C2O2H - oxalic acid,

H2SO3 - sulfurous acid, C3H6O3 - lactic acid

4. The photochemical decomposition of silver chloride (AgCl) and silver bromide (AgBr) is used in black and white photography.

5. BaCl2 + CuSO4 ---> BaSO4 + CuCl2

6. In this reaction, sulfur in H2S is replaced by Br. It means that H2S has lost hydrogen. Therefore, the equation shows that hydrogen sulfide (H2S) compound is being oxidized in this chemical reaction.

7. Acetic acid

8. Alkalies are the bases that are soluble in water.

9. The reaction between silver nitrate (AgNO3) and sodium chloride (NaCl), results in the formation of silver chloride (AgCl) that is an insoluble salt.

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