Sec. 5. REFUNDING BONDS; ELECTION; TAX TO PAY BONDS. To carry into effect orders adjusting bonded indebtedness when changes are made in school districts, the County Board of Education shall have the power to order the trustees of the districts affected, to order an election for the issuing of such refunding bonds as may be necessary to carry out the purpose of such order; and, in such case it shall be the duty of the district trustees to order such election, cause the same to be held, and if the proposition is carried, to issue the bonds voted. Such bonds shall be of the same denomination and carry the same interest rate and mature at the same time as the outstanding bonds owing by the district issuing them, and when so issued, shall, if possible be exchanged for the outstanding bonds for which the district issuing them shall still be liable, according to the order adjusting such indebtedness; and in cases where such an exchange can not be made, the new bonds of the district, to the amount of the old bonds for which it is still liable, and for which no exchange can be made, shall be deposited in the County Treasury to the account of such district. Thereafter taxes shall be levied and assessed only for the payment of the interest, sinking fund and principal of the new bonds so issued; and the funds arising from such taxation shall be used to discharge the principal and interest of such new bonds as have been issued and exchanged, and such old bonds as have not been exchanged and the proceeds applied to payment on old bonds not exchanged, the corresponding new bonds in the County Treasury shall be credited with such payment and retired as the old unexchanged bonds are retired.