chemistry help please

Jan 6th, 2015
HelloWorld
Category:
Chemistry
Price: $5 USD

Question description

The most electronegative element among the following is

A.sodiumB.bromine
C.fluorineD.oxygen

The metal used to recover copper from a solution of copper sulphate is

A.NaB.Ag
C.HgD.Fe

The number of d-electrons in Fe2+ (Z = 26) is not equal to that of

A.p-electrons in Ne(Z = 10)
B.s-electrons in Mg(Z = 12)
C.d-electrons in Fe(Z = 26)
D.p-electrons in CI(Z = 17)

The metallurgical process in which a metal is obtained in a fused state is called

A.smeltingB.roasting
C.calcinationsD.froth floatation

The molecules of which gas have highest speed?

A.H2 at -73oC
B.CH4 at 300 K
C.N2 at 1,027oC
D.O2 at 0oC

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