Riya noticed iron objects like iron nails and iron gate of her house covered with reddish brown substance. She observed this process is fast in the monsoon season. 31. The brown substances formed on iron objects is (A)Soil (B) Rust (C) Dust (D) saw dust 32. The chemical name of brown substance is (A)Iron dioxide (B) Iron sulphide (C)Iron hydroxide (D) Iron oxide 33. Which of this is a chemical change? (A)Freezing of water (B) drying of clothes (C) rusting of Iron (D) cutting of Iron 34. We can prevent rusting by the following (A) applying paint (B) applying oil (C) galvanizing (D) all of the above 35. Where will this process be faster? (A)Coastal region (B) Hot Desert like Thar (C)Cold Desert like Ladakh (D) None of these
Answers
Answer:
Cu
Since according to reactivity series, iron is more reactive than copper so it will displace sulphate from copper sulphate.
Fe+CuSO
4
→FeSO
4
+Cu
Copper is reddish brown in colour.
Explanation:
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Answer about iron and rust are as follows -
31. The brown substances formed on iron objects is (B) Rust
On contact with moisture present in air, iron reacts with oxygen to form rust.
32. The chemical name of brown substance is (D) Iron oxide
Iron oxide is called rust.
33. Which of this is a chemical change? (C) rusting of Iron
Physical change does not involve change in composition of elements and does not involve chemical reaction. As rusting involves both, it is a chemical change.
34. We can prevent rusting by the following (D) all of the above
Applying a protective layer on iron prevents it's contact with moisture thus protecting it from rusting
35. Where will this process be faster? (A)Coastal region
Coastal region is highly humid due to absorption of moisture from air, which comes from sea. So the process will be faster in such region.