A student is given four solid samples labeled W, X. Y, and Z. All have a metalli

Question

A student is given four solid samples labeled W, X. Y, and Z. All have a metallic luster. She is told that the solids could be gold, lead sulfide (PbS), quartz which isSiO_2, and iodine. The results of her investigations 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 shatters 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 6M HNO_3, X dissolves; there is no effect on W, Y, or Z. On the basis of these

Explanation / Answer

W is good conductor . It is Au

X is powder        . it is SiO2

y is not powder. it is PbS

Z is form sublimation. it is I2

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