Chlorophyll is a naturally occurring chelate compound in which central metal is

Chlorophyll is a naturally occurring chelate compound in which central metal is

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1) Which among the following is a positively charged particle emitted by a radioactive element?

2) Permanent hardness of water may be removed by the addition of

3) Which of the following is used as a moderator in nuclear reactor?

4) The most important ore of aluminium is

5) Knot is a unit of speed of which of the following?