Question

Sodium carbonate is a basic salt because it is a salt of
(a) strong acid and strong base
(b) weak acid and weak base
(c) weak base and strong acid
(d) strong base and weak acid

NCERT Class X
Science - Exemplar Problems

Chapter_SAMPLE QUESTION PAPER-I

Answer 1

answer : option (d) strong base and weak acid.

explanation : A salt is formed by two components . one component is a part of acid and other component is part of base. if base part is strong , then salt will be basic in nature and if acid part is strong, then salt will be acidic in nature.

here given, sodium carbonate (Na2CO3)

2Na^+ is came from sodium hydroxide (NaOH), a strong base

and (CO3)²- is came from carbonic acid (H2CO3), a weak acid

it is clear that, Na2CO3 is formed by strong base and weak acid. so, Na2CO3 is basic in nature or it is a basic salt.

hence, option (4) is correct

Answer 2

Answer:

Explanation:

Strong base and weak acid is the correct answer