Task: Question Answering
Input (English): Question: By heating in electric furnaces of silica, calcium carbide and coal, calcium silicides are obtained. One of them: 
 Options:  <1> It has the composition CaSi2. <2> It does not react with water. <3> Does not react with sulfuric acid. <4> It is a powerful oxidizing agent. <5> Its reaction with liquid water generates calcium silicate.
Output (English): 1