Question

Gobar gas contains mainly

• A. ${\mathrm{CH}}_4+{\mathrm{CO}}_2$
• B. ${\mathrm{CH}}_4+{\mathrm{O}}_2$
• C. ${\mathrm{CO}}_2+{\mathrm{H}}_2$
• D. ${\mathrm{CO}}_2+{\mathrm{SO}}_2$

Answer 1

The correct option is A

${\mathrm{CH}}_4+{\mathrm{CO}}_2$

The explanation for the correct answer:

Option (A) ${\mathrm{CH}}_4+{\mathrm{CO}}_2$

• Under anaerobic conditions, certain bacteria break organic matter and produce biogas, which is a Renewable source.
• Biogas is also known as Gobar gas.
• It is a mixture of Methane $\left({\mathrm{CH}}_4\right)$, Hydrogen $({\mathrm{H}}_2)$ and Carbon dioxide $\left({\mathrm{CO}}_2\right)$
• The major constituents of biogas in which their percentage are: Methane $\left({\mathrm{CH}}_4\right)-50-75\%$, Carbon dioxide $\left({\mathrm{CO}}_2\right)-25-50\%$, Nitrogen $\left({\mathrm{N}}_2\right)-10-20\%$, Hydrogen $\left({\mathrm{H}}_2\right)-0-1\%$, Hydrogen sulphide $\left({\mathrm{H}}_2\mathrm{S}\right)-0-3\%$, Oxygen $\left({\mathrm{O}}_2\right)-0-0.5\%$
• As ${\mathrm{CH}}_4+{\mathrm{CO}}_2$ has the highest percentage of biogas constituents, they were the main constituents.

The explanation for Incorrect answers:

Option (B) ${\mathrm{CH}}_4+{\mathrm{O}}_2$

• According to the percentage of the constituents, ${\mathrm{O}}_2$percentage is low.
• So it cannot be considered as the main constituent of gobar gas.

Option (C) ${\mathrm{CO}}_2+{\mathrm{H}}_2$

• As mentioned above, Hydrogen contains the lowest percentage of gobar gas.
• So this is not the correct option.

Option (D) ${\mathrm{CO}}_2+{\mathrm{SO}}_2$

• Gobar gas does not contain sulphur dioxide $\left({\mathrm{SO}}_2\right)$.
• So ${\mathrm{CO}}_2+{\mathrm{SO}}_2$ cannot be considered correct.

Hence, Option (A) ${\mathrm{CH}}_4+{\mathrm{CO}}_2$ is correct.