Which element would have physical and chemical properties similar to neopy

$($A$)Ar$

$($B$)Br$

$($C$)S$

$($D$)O$

Using the following balanced equation

The moles of oxygen needed to react with $7\mathrm{.}50$ moles of ammonia $(N{H}_3)$

$($A$)2\mathrm{.}80$ moles

$($B$)5\mathrm{.}63$ moles

$($C$)3\mathrm{.}00$ moles

$($D$)1\mathrm{.}80$ moles

$7.$ The measurement $55000m$ in scientific notation becomes

$($A$)5\mathrm{.}5000{10}^{4}m$

$($B$)5\mathrm{.}5{10}^{4}m$

$($C$)5\mathrm{.}50{10}^{-4}m$

$($D$)5\mathrm{.}5{10}^{-4}m$

$8.$ The measurement $35\mathrm{.}7823m$ rounded off to three significant figures is

$($A$)35\mathrm{.}7m$

$($B$)35\mathrm{.}70m$

$($C$)35\mathrm{.}8m$

$($D$)35\mathrm{.}80m$

$9.$ Which of the following are valid electron configurations?

I $,1S^{2}2S^{2}2p^{6}3S^{2}3p^1,$ II $,1S^{2}2S^{2}2p^{4}3S^1$

III $1S^{2}2S^{2}2p^{6}3S^{2}3p^6,$ IV $1S^{2}2S^1$

$($A$)$ only I

$($B$)$ only II

$($C$)1,$ III $8$ IV

$($D$)1,$ II $,$ III & IV

$10.$ The formula for ammonium carbonate is

$($A$)N{H}_{4}C{O}_3$

$($B$)(N{H}_4{)}_{2}C{O}_3$

$($C$)N{H}_4(C{O}_3{)}_2$

$($D$)(N{H}_4{)}_3(C{O}_3{)}_2$

$11.$ Consider the following grid:

$\backslash$table$[[1.,2.,3.,4.,5.],[(N{H}_4{)}_{2}S{O}_4,F{e}_2{O}_3,FeC{l}_3,C{a}_3(P{O}_4{)}_2,N{H}_{4}Cl$