Elements and Compounds
Compounds may be broken down into simple substances by
ordinary reaction
chemical reaction
physical reaction
evaporation
chemical reaction
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To make specific compound, elements are mixed in a fix proportion byA. mass
B. weight
C. volume
D. density
The gas which is used as cooling agent is
A. carbon dioxide
B. helium
C. argon
D. nitrogen
Nitric acid is combined with oxygen to produce brown fume of
A. nitrogen oxide
B. nitrogen dioxide
C. carbon dioxide
D. nitrogen
Sand is made up of
A. silicon
B. oxygen
C. glass
D. both a and b
Wolfram is a chemical name of an element called
A. iron
B. magnesium
C. sodium
D. tungsten
The person who first arranged elements in form of periodic table was
A. Lewis
B. Mendeleev
C. Thomas
D. Darwin
The elements that are named after famous scientists, are
A. Curium
B. Einsteinium
C. Mendelevium
D. all of above
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