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CHEMISTRY

Chemistry
The graphite rods in the nuclear reactor

produce neutrons
convert fast moving neutrons into thermal neutrons
react with U to release energy
undergo combustion which triggers the nuclear fission

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Chemistry
The first metal used by man was

copper
iron
gold
bronze

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Chemistry
The hydronium ion is

H+
H2+
HO -
H3O+

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Chemistry
The most electropositive elements among the following is

Na
Ca
K
Cs

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Chemistry
The method that cannot be used for removing permanent hardness of water is

adding sodium carbonate
distillation
adding caustic soda
boiling

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