Sorry, that is incorrect.

The only correct answer is: electrophilic addition 

Sorry, that is incorrect.

The only correct answer is: 16 $\sigma$ bonds and 1 $\pi$ bonds

• 5 $\sigma$ bonds and 2 $\pi$ bonds is incorrect because there are 10 $\sigma$ C-H bonds, 6 C-C $\sigma$ bonds and 1 C-C $\pi$ bond
• 6 $\sigma$ bonds and 1 $\pi$ bonds is incorrect because there are 10 $\sigma$ C-H bonds, 6 C-C $\sigma$ bonds and 1 C-C $\pi$ bond
• 15 $\sigma$ bonds and 2 $\pi$ bonds is incorrect because there are 10 $\sigma$ C-H bonds, 6 C-C $\sigma$ bonds and 1 C-C $\pi$ bond

Sorry, that is incorrect.

The only correct answer is: carbon particulates

• carbon particulates is incorrect because oxides of nitrogen are not black solids
• oxides of sulfur is incorrect because oxides of sulfur are not black
• unburnt hydrocarbons is incorrect because unburnt hydrocarbons are not black solids

Sorry, that is incorrect.

The only correct answer is: $Br^{+}_{(g)}-e^{-} \longrightarrow Br^{2+}_{(g)}$

• $Br_{(g)}+e^{-} \longrightarrow Br^{-}_{(g)}$ is incorrect because it is the equation for first electron affinity.
• $Br^{-}_{(g)}+e^{-} \longrightarrow Br^{2-}_{(g)}$ is incorrect because it is the equation for second electron affinity.
• $Br_{(g)}-2e^{-} \longrightarrow Br^{2+}_{(g)}$ is incorrect because it is an equation that combines both first and second ionization.

Sorry, that is incorrect.

The only correct answer is: quantum shells

• Atoms: This is incorrect because atomic emission spectroscopy does not provide evidence for the existence of atoms.
• Electrons: This is incorrect because atomic emission spectroscopy does not provide evidence for the existence of electrons.
• Isotopes: This is incorrect because the evidence for isotopes is provided by mass spectroscopy.

Sorry, that is incorrect.

The only correct answer is: 12 

• 5 is incorrect because this is the number of electrons in the 3p orbitals of the chlorine atom
• 6 is incorrect because this is only the number of electrons in the 3p orbitals of the chloride ion
• 18 is incorrect because this is the total number of electrons in the chloride ion, not just those in the p orbitals.

Sorry, that is incorrect.

The only correct answer is: 801 , 2,427 , 3,660 , 25,026 , 32,828

• 738 , 1,451 , 7,733 , 10,541 , 13,629 is incorrect because it is typical of group 2 elements.
• 1,086 , 2,353 , 4,621 , 6,223 , 37 832 is incorrect because it is typical of group 4 elements.
• 1,402 , 2,856 , 4,578 , 7,475 , 9 445 is incorrect because it could be for group 5,6,7,8 or transition elements.

Sorry, that is incorrect.

The only correct answer is: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{6}$

• $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}$ is incorrect because this is the electronic configuration of $^{33}As^{3+}$
• $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{3}$ is incorrect because this is the electronic configuration of $^{33}As$
• $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{3}4d^{3}$ is incorrect because this has added electrons in the $4d$ orbital.

Sorry, that is incorrect.

The only correct answer is: acid-base 

• displacement is incorrect there Is no displacement taking place
• redox is Incorrect because neither substance is oxidized or reduced
• substitution is incorrect because there is no substitution taking place

Sorry, that is incorrect.

The only correct answer is: giant ionic