chemistry help please

chemistry help please

The most electronegative element among the following is

A. sodium B. bromine
C. fluorine D. oxygen

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

A. Na B. Ag
C. Hg D. 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. smelting B. roasting
C. calcinations D. 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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