What are the characteristics of bases?

Base's physical characteristics:
1) Bitter in taste
2) Soapy feeling (in shampoo or body wash)
3) pH>7

Base's chemical characteristics:
1) BASW ( Base reacts with Acid to form Salt and Water)
2) Ability to turn moist red litmus paper blue due to its basic properties. (pH>7)
3) IMPORTANTLY is that it dissociate Into OH- ions or hydroxide ion when dissolved in water! (For alkali)

Alkali is SOLUBLE salt. Most bases are insoluble.

Reaction involved in present system is :   c12h22o11 + h2o → 2 c6h12o6the reaction system is obeying following rate law:   rate = k[c12h22o11]thus, it is a first order reaction.now, for 1st order reactionrate constant (k) =  given: initial conc. = 3.0 g, final conc. = 2.7 g, t = 2.5 h∴rate constant (k) =  ∴ k = 0.04215 h-1now, for 1st order reaction, half life = 0.693/k = 0.693/0.04215 = 16.4 hthus correct answer is option b