The qualified electors of any territory contiguous to and adjoining any existing municipality and the qualified electors of any territory which is a part of an existing municipality, may be included in or excluded from such municipality, as the case may be, in the manner hereinafter provided. Whenever the inhabitants of any incorporated territory adjacent to any municipality shall desire to be included therein, and whenever the inhabitants of any territory which is a part of an existing municipality shall desire to be excluded therefrom, they shall prepare a petition and file same in the chancery court of the county in which such municipality is located, which said petition shall be signed by at least two-thirds of the qualified electors residing in the territory proposed to be included in or excluded from such municipality. Said petition shall describe accurately the metes and bounds of the territory proposed to be included in or excluded from such municipality, shall set forth the reasons why the public convenience and necessity would be served by such territory being included in or excluded from such municipality, as the case may be, and shall be sworn to by one or more of the petitioners. In all cases, there shall be attached to such petition a plat of the municipal boundaries as same will exist in the event the territory in question is included in or excluded from such municipality. No territory may be so excluded from a municipality within two years from the time that such territory was incorporated into such municipality, and no territory may be so excluded if it would wholly separate any territory not so excluded from the remainder of the municipality. No petition for the inclusion or exclusion of any territory under this section shall be filed within two years from the date of any adverse determination of any proceedings originated hereinafter under this chapter for the inclusion or exclusion of the same territory.