Engineering Entrance Exams Question:

What is the common name of cis- dichloro Dicyano platinate?

cis-platin

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How a student should prepare for gate exams	I wrote letters to four different people and wrote their addresses on four envelopes. But while inserting each letter into an envelope. I was careless. Either I put three letters in right envelopes, or I put two letters in right envelopes or I put one letter in wrong envelope, what did I do?