Question

Which of the following is property of base?
(A) Soapy to touch
(B) Good conductors of electricity
(C) Liberates heat on dilution
(D) All of above

Answer 1

Hint: Bases are slippery in touch,bitter in taste,liberate ions on dilution.They give electrolyte in solution. With this information,the correct answer should be predictable.

Complete step-by-step answer: Bases are those chemical substances which can neutralize the effect of an acid. Mostly bases do not dissolve in water but some do. The bases that dissolve in water are called alkalis.
We will identify physical as well as chemical properties of bases. Physical properties are those which can be identified by our sense organs . We can touch, see, smell ,or feel these physical properties and identify them.
The following are the physical properties of bases-
I. They are bitter in taste.
II. They are soapy or slippery to touch.
III.They turn red litmus blue.
The chemical properties of the bases are-
I. They react with acids to form salt and water.
II. Bases react with metal and liberate hydrogen gas.
III. Some bases conduct electricity but only in aqueous state. They are not very good conductors in solid state.
IV. Bases produce hydroxide ions in solution.
V. They liberate ions and heat on dilution .

Hence,the correct option is (D).

Note: Bases are the chemical opposites of acids. Some examples of the bases are sodium hydroxide, calcium carbonate , soaps , toothpaste etc. When we say that a substance is basic,we mean that it will exhibit the above properties .