National Science Olympiad Forum By SOF Olympiad Trainer - Page 51

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Subject :NSO    Class : Class 9

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Subject :NSO    Class : Class 8

Read the following statements carefully.
W : I am very reactive and catch fire if exposed to air. To prevent this, I am stored in water.
X : I am a good conductor of heat and acquire a reddish-brown coating on exposure to moist air.
Y : I am soft and have dull appearance. I form acids on reacting with oxygen and water.
Z : I am malleable, ductile and acquire a dull green coating on exposure to moist air.
Identify W, X, Y and Z.

--------W---------------X-------------Y--------------Z
APhosphorus--Copper------Sulphur--------Iron
BPhosphorus--Iron----------Sulphur--------Copper
CSulphur------Iron-----------Phosphorus---Copper
DCopper------Phosphorus---Iron------------Sulphur


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