Explain why:
Heating systems based on circulation of steam are more efficient in warming a building than those based on circulation of hot water.

Why is the closed circulatory system more efficient than the open system?

Explain why MeNH_2 is stronger base than MeOH?

Define tracheal intercom. Why is the respiratory system of cockroach more efficient than that of earthworm?

Why aquatic species feel more comfortable in cold water than hot water ?

These question consist of two statements each, printed as Assertion and Reason. While answering these questions you are required to choose any one of the following responses If both Assertion and Reason are true and Reason is a correct explanation of Assertion If both Assertion and Reason is a not a correct explanation of Assertion If Assertion is true but Reason is false If both Assertion and Reason are false Assertion: BaCO_3 ​ is more soluble in HNO_3 ​ than in plain water. Reason: Carbonate is a weak base and reacts with the H^+ from the strong acid, causing the barium salt to dissociate.

Choose the correct set of True/Fasle for following statements: (i) Silver chloride is more soluble in very concentrated sodium chloride solution than in pure water. (ii) The pH of a buffer solution does not change on addition of small amount of an acid or a base. (iii) Addition of NH_(4)Cl does not affect the pH of a solution of NH_(4)OH (iv) Degree of hydrolysis of ammonium acetate does not depend upon the concentration of ammonium acetate solution. (v) A mixture of acetic acid and sodium acetate can act as buffer solution.

Respriatory system of cockroach is formed of spiracels and tracheal intercom. Why it is said to be more efficient than that of earthworm? Why inspritation of cockraoch is said to be a passive process while it is an active process in man?