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 of the following rays are more penetrating?

2) Which one of the following is the petroleum wax?

3) What is the unit for measuring the amplitude of a sound?

4) Which metal pollute the air of a big city?

5) The two elements that are frequently used for making transistors are