Which of the following has an octet?

Neon

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C O_{2}

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Helium

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Both A and B

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Solution

The correct option is D Both A and B
Neon and other noble gases have eight electrons in their outermost shell. In carbon dioxide each oxygen shares four electrons with the central carbon. Thus they form octet and attain stable configuration. Since helium has only two electrons in its valence shell, it cannot have an octet.

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Q. Which of the following has the same value as

Δ_{f} H^{⊖}

C O

\frac{1}{2} Δ_{f} H^{⊖} (C O_{2})

\frac{1}{2} Δ_{c} H^{⊖} (g r a p h i t e)

Δ_{f} H^{⊖} (C O_{2}) - Δ_{f} H^{⊖} (g r a p h i t e)

Δ_{c} H^{⊖} (g r a p h i t e) - Δ_{c} H^{⊖} (C O) ?

Which of the following are true regarding CO₂?

(A) Excess of CO₂ acts as a pollutant.

(B) Plants take in CO₂ for photosynthesis.

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Which of the following are true regarding $C O_{2}$ ?
a. Excess of $C O_{2}$ acts as a pollutant.
b. Plants take in $C O_{2}$ for photosynthesis.
c. Deforestation leads to decrease in the amount of $C O_{2}$ in air.
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Q. Which of the following are true regarding

C O_{2}

a. Excess of

C O_{2}

acts as a pollutant
b. Plants take in

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