Court not to question validity of the acts of certain Adininistrators.

Court not to question validity of the acts of certain Adininistrators.-No court shall question any action taken, things done, appointments and transfers made, powers exercised or purported to be exercised and taxes levied and recovered by an Administrator referred to in section 4 on the ground that his appointment was invalid and accordingly- (a) no suit or other proceeding shall be maintained and continued in any court on such ground for the refund of any tax levied and collected by the said Administrator for or on behalf of a Municipal Board covered by the notification referred to in section 4; and (b) any tax levied by the said Administrator but not collected before the commencement of this Act may be recovered by the said Municipal Board in accordance with law as if the Administrator was duly appointed.