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In the preparation of ultra filter paper...

In the preparation of ultra filter paper collodion solution is used collodion is

A

`4%` solution nitro cellulose in a mixture of alcohol and ether

B

`4%` solution cellulose acetate in phenol

C

`8%` solution cellulose acetate in alcohol

D

formaldehyde in water

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The correct Answer is:
A
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