Datasets can be virtually integrated into the Linked Data space through RDF mappings. An RDF mapping consists of rules that map data from an input dataset to RDF triples. Defining SPARQL queries is an arduous task. As RDF mappings define semantic schemas, it is possible to use them to deduce federated queries. In this demonstration, we propose MaRQ, a tool that deduces federated queries from a set of RDF mappings. The goal is to provide a clear idea of the conjunction possibilities of a dataset with other virtually integrated datasets.