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Ozone attacks
1 Mercury and silver
2 Copper
3 Silver and iron
4 None of these
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WHAT IS THE FUNCTION OF NIKEL IN CHEMICAL REACTION
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Which of the following is the basis of modern periodic table? 1 Atomic mass 2 Atomic number 3 Atomic size 4 Atomic volume
When a person sends a message to someone with the Internet, there are steps that happen to the recipient to receive the message. How does the recipient know that the message was not edited by someone else?
why we can't make our living room as refrigerator?
Biological Sciences 
