Elements and Compounds
The gas which is used as cooling agent is
carbon dioxide
helium
argon
nitrogen
nitrogen
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Compounds may be broken down into simple substances byA. ordinary reaction
B. chemical reaction
C. physical reaction
D. evaporation
To make specific compound, elements are mixed in a fix proportion by
A. mass
B. weight
C. volume
D. density
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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