Question

Help me please.
Why was the plague able to spread so quickly throughout Constantinople?

Answer 1

Answer:

• The Black Death was an epidemic which ravaged Europe between 1347 and 1400. It was a disease spread through contact with animals (zoonosis), basically through fleas and other rat parasites (at that time, rats often coexisted with humans, thus allowing the disease to spread so quickly).

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Answer 2

Answer:

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QUESTION

A metal ‘X’ acquires a green colour coating on its surface on exposure to air.

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ANSWERS"

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(i)Identify the metal ‘X’ and name the process responsible for this change.

Ans . metal 'X'is a copper.

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(ii) Name and write chemical formula of the green coating formed on the metal.

Ans .This lead to corrosion of cu metal by formation of green coating.

______________________

(iii) List two important methods to prevent the process.

Ans. 1. we should apply grease on the surface of metal time to time.

2. we should apply paint on the surface of metal.

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hope it helps you

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