Question

1. In whitewashing of walls. soluble slaked lime (Ca(OH)2
s used. But the product on the walls is insoluble in
water. Can you suggest the chemical change which
occurs on the walls? Name the type of reaction.
2. Can a displacement reaction be also a redox reaction?
3. Identify the reducing and oxidising agents in the
reaction: Pbs + 4H2O2 → PbSO4 + 4H2O
4. Can a combination reaction be also a redox reaction?
5. Why is it that the oxidation and reduction reactions
are complementary to each other?
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Answer 1

ANSWER

1. Quick lime( calcium oxide) reacts with water to form slaked lime(calcium hydroxide)

CaO + H2O -------- Ca(OH)2

*This rection is combination reaction .

Then this slaked lime is used in white washing,it will react with atmosphere CO2 to form shiny layer of Calcium carbonate (CaCO3)

Ca(OH)2 + CO2 -------- CaCO3

* This change is decomposition reaction.

2.

Yes, a simple displacement reaction isalso a redox reaction, as it is always accompanied by oxidation-reduction.

In this reaction, the more electronegative chlorine displaces iodine from its salt, potassium iodide. ...

Here, zinc is oxidised to +2 state from zero state, and hydrogen is reduced to zero state from +1 state

Answer 2

Answer:

Yes these all answers given are correct