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Four solids W,X , Y and Z are given . A...

Four solids W,X , Y and Z are given . All have a metallic lustre. The solids could be gold, lead sulphide , mica (which is quartz or `SiO_2`) and iodine . The results of the investigation are :
(a)W is a good electrical conductor . X,Y and Z are poor electrical conductors
(b)When the solids are hit with a hammer, W flattens out , X shaltters into many pieces, Y is smashed into a powder and Z is not affected .
(c )When the solids are heated with a Bunsen burner, Y melts with some sublimation, but X, W and Z do not melt.
(d)In treatment with `7M HNO_3`, X dissolves and there is no effect on W,Y or Z
On the basis of these test results, identify the solids

Text Solution

Verified by Experts

X=PbS, `Y=I_2`, Z= Mica , W=Gold
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