Which of the following is considered the cleanest fuel? MCQ with Answer and Explanation

Explanation:
The combined gas law integrates Boyle's (P₁V₁ = P₂V₂), Charles' (V₁/T₁ = V₂/T₂), and Gay-Lussac's (P₁/T₁ = P₂/T₂) laws into one equation: P₁V₁/T₁ = P₂V₂/T₂ for a fixed amount of gas. It assumes ideal behavior. When one variable is constant, the respective individual law can be derived. For changing conditions, this combined form is useful. For n moles, PV = nRT.

Explanation:
Alkenes follow CₙH₂ₙ. C₂H₄ (ethene) fits n=2 giving H=4. C₂H₆ and CH₄ are alkanes (CₙH₂ₙ₊₂); C₃H₈ is propane (alkane). Alkenes contain a carbon-carbon double bond.

Explanation:
Gamma rays (γ) are high-energy electromagnetic radiation (photons). Unlike alpha particles (mass, +2 charge) and beta particles (mass, -1 charge), gamma rays have zero rest mass and no electrical charge. Thus, they are not deflected by electric or magnetic fields.