There is no prescribed format of the declarations u/s 11(5) and u/s 13(1)(c). I am hereunder provding the formats for you.
DECLARATION U/S 11(5):
We, the trustees of ___________________________ (name of the trust)/Office bearers of __________________(name of the society or organisation) do hereby state that the funds of the trust/society are invested/deposted in the modes prescribed under section 11(5) of the Income-tax Act, 1961 and shall be continued to be invested/deposited in the same modes.
DECLARATION U/S 13(1)(c):
We Trustees/Oficer bearers of _____________________(name of the trust/soiety/ornanisatin) do hereby state that no part of the income of the trust/society/organisation and none of the properties/ assets of the trust/society/organisation have been used or applied directly or indirectly for the benefit of the author/founder, any trustees/office bearers, who has made substantial contribution (exceeding fifty thousand rupees), any family member of the author/founder of the turst, any relative of the author/founder, trustee or the relative of the person who has made substnatial contribution fo the turst/society/organisation or any concern in which the author/founder, trustees, office bearers or the person who has made substantial contribution to the trust/society/organisatin or any relative of these persons has a substantial interet.