Which of the following is a decomposition reaction used in black and white photography? MCQ with Answer and Explanation

Explanation:
PVC (polyvinyl chloride) is a polymer of vinyl chloride (CH₂=CHCl). It is used in pipes, electrical insulation, and flooring. It can be rigid (uPVC) or flexible with plasticizers. It is a thermoplastic. Chlorate/carbon/carbide are not correct expansions.

Explanation:
Number of half-lives = 6/2 = 3. Remaining = (1/2)³ = 1/8. After each half-life, half the remaining decays.

Explanation:
Ideal gas equation: PV = nRT is obtained by combining Boyle's law (PV = constant at T,n), Charles' law (V ∝ T at P,n), and Avogadro's law (V ∝ n at P,T). Graham's law deals with diffusion, Dalton's with partial pressures. The constant R is the universal gas constant. For 1 mole, PV = RT. Real gases deviate at high pressure and low temperature.