Chemistry
Assertion (A): All bases react with acids to form salt and water only.
Reason (R): All alkalis are bases but all bases are not alkalis.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Answer
Both A and R are true but R is not the correct explanation of A.
Explanation — All bases react with acid to form salt and water. This reaction is called as neutralisation reaction. Hence the assertion (A) is true.
Alkalis are bases that are soluble in water. All alkalis are bases but all bases are not alkalis.
For example: Ferric hydroxide [Fe (OH) 3 ] and Cupric hydroxide [Cu (OH) 2] are bases, but not alkalis because they are insoluble in water. Hence reason (R) is also true but it does not support the assertion (A).
Related Questions
Lead sulphate can be prepared by the following methods.
P Reacting lead with sulphuric acid.
Q Reacting lead nitrate with sodium sulphate solution.
R Reacting lead oxide with sodium sulphate solution.(a) Only P
(b) Only Q
(c) Only R
(d) Both Q and RAssertion (A): All acids form hydronium ions when dissolved in water.
Reason (R): Every acid has hydrogen as the necessary element.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Assertion (A): Acids which contain carbon are necessarily organic acids.
Reason (R): All organic acids are derived from plants and animals.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): Acids have a pH of more than 7.
Reason (R): Acids produce hydronium ions as the only positively charged ion in solution.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.