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Q.

 The function of Fe(OH)3 in the contact process is

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a

to detect colloidal impurity

b

to remove arsenic impurity

c

to remove dust particles

d

to remove moisture

answer is D.

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Detailed Solution

In the Contact process, arsenic oxide is a poison for the catalyst. It is removed when the gas is passed over ferric hydroxide.    

The reaction is as follows:                                    
As2​O3 ​+  2Fe(OH)3​  →  2FeAsO3​  +  3H2​O

Hence, the function of Fe(OH)3​ in the contact process is to remove arsenic impurities.

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