The property which is not shown by acids is :
(a) they have a sour taste
(b) they feel soapy
(c) they turn litmus red
(d) their pH is less than seven
Option B is correct. Soapy nature is the property of alkali.
Question 19
Fill the blanks in the following sentences (a) Lemon juice and vinegar taste ___ because they contain ___ (b) Turmeric and litmus are ___acid-base indicators. (c) Phenolphthalein gives___colour with lime water (d) When an acidic solution is mixed with a basic solution, they___ each other forming a and water.