The bond formed between iron (electronegativity = 1.9) and chlorine (electronegativity = 3.2) is

Polar covalent.

Explanation:

Hello,

In this case, ionic and covalent bonds could be differentiated by subtracting the constituents' electronegativities. Thus, for iron and chlorine, we have:

Hence, when such difference is less than 1.7, the bond is polar covalent as it is also greater than 0.7.

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answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.

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