why does ship suffer a lot of damage from rusting in spite of being painted

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Solution

As the ships have large surface area and there is availability of moisture in the air near the sea water. Thus in presence of oxygen, the condition supports the rusting in the ship.

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Q. Why does painting of an iron gate prevent it from rusting? Explain giving reason.

Question 11

State whether the following statements are true or false:

(a) When a candle burns, both physical and chemical changes take place.
(b) Anaerobic bacteria digest animal waste and produce biogas.
(c) Ships suffer a lot of damage though they are painted.
(d) Stretching of rubber band is not a physical change.

Q. This section contains 1 Assertion-Reason type question, which has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.

इस खण्ड में 1 कथन-कारण प्रकार का प्रश्न है, जिसमें 4 विकल्प (a), (b), (c) तथा (d) दिये गये हैं, जिनमें से केवल एक सही है।

A : Ships suffer a lot of damage from rusting in the sea.

समुद्र में जहाजों पर जंग लगने से काफी क्षति होती है।

R : The salt water makes the process of rust formation faster.

लवणयुक्त जल, जंग लगने के प्रक्रम की दर को बढ़ा देता है।

Q. Why do we fail to absorb information in spite of reading a lot?

(a) What is rust? Give the equation for the information of rust.

(b) State two conditions necessary for rusting of iron?

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