CBSE 2024 · Region 3 · Set 1 · Q34

(i)

Five solutions A, B, C, D and E when tested with pH paper showed pH as $\displaystyle 4$, $\displaystyle 1$, $\displaystyle 13$, $\displaystyle 7$ and $\displaystyle 10$ respectively. Which solution is :

(1)

Strongly acidic ($\displaystyle 2$) Strongly alkaline ($\displaystyle 3$) Weakly acidic

(4)

Neutral and ($\displaystyle 5$) Weakly alkaline ? Arrange the solutions in increasing order of $\displaystyle \mathrm{H}^{+}$ion concentration.

(ii)

Write the name and formula of ($\displaystyle 1$) an acidic salt and ($\displaystyle 2$) a basic salt giving the name of the parent acid and parent base used to form the salt in each case.

(ii)

OR 34. (b) Name and state in brief the process which is used to prepare sodium hydroxide from sodium chloride. In this process along with the main product two gases 'X' and 'Y' are also given off at the two electrodes. Name 'X' and 'Y' specifying the name of their respective electrode at which each gas is obtained. One of these gases when reacts with dry calcium hydroxide produces a compound 'Z' which is widely used in water treatment plants and textile industries. Name Z and write chemical equation for the reaction involved in its formation.