Boyle's law states that at constant temperature, the pressure of a fixed mass of gas is: MCQ with Answer and Explanation

Explanation:
NH₄Cl is from HCl (strong) and NH₄OH (weak). Its aqueous solution is acidic due to hydrolysis of NH₄⁺. NaCl is neutral (strong-strong). CH₃COONa basic (weak-strong).

Explanation:
Evaporation increases with an increase in surface area, temperature, and wind speed, and decreases with an increase in humidity. A larger surface area allows more liquid molecules to be exposed to the air, enabling them to escape into the vapor phase more quickly, thus increasing the rate of evaporation.

Explanation:
Leguminous plants (like peas, beans) have a symbiotic relationship with Rhizobium bacteria in their root nodules. These bacteria convert atmospheric N₂ into usable nitrogen compounds, fulfilling the plant's nitrogen needs. Thus, they generally do not need external nitrogenous fertilizers. Both statements are correct and R explains A.