NCERT Solutions for Chapter: Acids, Bases and Salts, Exercise 1: Exercise

The equation below shows a chemical reaction.
$\mathrm{X}$ is a non-metal, but $\mathrm{Y}$ is a metal.

${\mathrm{H}}^{\left[+\right]}\mathrm{X}+{\mathrm{YOH}}^{\left[-\right]}\to \mathrm{YX}+\mathrm{HOH} \mathrm{YOH}\to \mathrm{YX}+\mathrm{HOH}$

What is the chemical nature of $\mathrm{YX}$?

Write your answer in terms of acid/base/salt.

Builders use plaster of Paris to make the surface layer of the inner walls of a building.

Which property of plaster of Paris powder makes it a suitable building material?

To prepare a salad dressing, Parag adds a solution of sodium chloride in distilled water to vinegar.

State what change will occur in the following:

• The pH of the vinegar
• The acidity of the vinegar

Rajesh was given a substance and asked to identify it. He conducted three tests on the substance and recorded the results below. (P) It releases carbon dioxide, water, and a sodium salt on heating with water. (Q) It turns universal indicator greenish-blue. (R) It can be prepared from ammonia as a raw material.

What substance was Rajesh given?

Rajesh was given a substance and asked to identify it. He conducted three tests on the substance and recorded the results below. (P) It releases carbon dioxide, water, and a sodium salt on heating with water. (Q) It turns universal indicator greenish-blue. (R) It can be prepared from ammonia as a raw material.

Give one use of the substance based on the properties mentioned in P and Q.

Rajesh was given a substance and asked to identify it. He conducted three tests on the substance and recorded the results below. (P) It releases carbon dioxide, water, and a sodium salt on heating with water. (Q) It turns universal indicator greenish-blue. (R) It can be prepared from ammonia as a raw material.

Rajesh later read that recrystallisation of the sodium salt formed in P gives another basic salt that is used in manufacture of borax.

Identify the sodium salt formed in P.

Two salts X and Y are taken in two test tubes A and B, respectively and subjected to heating. Water is added to two test tubes, in case of A salt regains its original colour and in case of B water starts boiling. Then, X and Y may be, respectively: 

One molecule of an 'ic' acid of a non-metal having $5$ electrons in a valence shell reacts with a molecule of a base to form a salt $\mathrm{X}$. The base corresponds to the metal with one electron in the valence shell. If the salt so formed can react with the same base in $1:2$ ratio, predict the formula of the salt $\mathrm{X}$.