Elements and Compounds
The dense white fumes which can be seen upon gas ammonia are due to mixing of
hydrogen chloride
nitrogen dioxide
ammonium chloride
calcium chloride
hydrogen chloride
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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
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
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