A few milligrams of Iron [II] chloride was left exposed to air. It was observed that there was a change in its appearance, and gain in its weight.
What change in appearance is observed?
Why is there a gain in weight?

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Solution

When iron chloride is exposed to air,it get oxidized.
And a corrosive brown yellow coating of basic ferric sulphate is formed.
For the equation you can refer the above picture.
The new compound is heavier than old one.so the weight increased.
ie ferric sulphate is formed.
Now about the color,
The color is brown yellow as I mentioned.

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A few milligrams of Iron [II] chloride was left exposed to air. It was observed that there was a change in its appearance, and gain in its weight. What change in appearance is observed? Why is there a gain in weight?

A few milligrams of Iron [II] chloride was left exposed to air. It was observed that there was a change in its appearance, and gain in its weight.
What change in appearance is observed?
Why is there a gain in weight?