Embibe Experts Solutions for Chapter: The s-Block Elements, Exercise 4: Exercise-4

Correct name is written against which of the following chemical formulae?

Write the chemical formula of following compounds:
(a) Potassium pyrosulphite
(b) Potassium hydrogenpyrophosphite
(c) Barium permanganate
(d) Vanadium $\left(\mathrm{III}\right)$ phosphate
(e) Ferric sulphate
(f) Magnesium phosphite
(g) Cadmium nitride
(h) Calcium metaborate
(i) Ammonium hyponitrite
(j) Aluminium hydrogenphosphite

Crystals of washing soda lose nine molecules of water when exposed to dry air. This phenomenon is known as:

Consider the following statements:

${\mathrm{S}}_1$: Gypsum contains a lower percentage of calcium than plaster of pairs.

${\mathrm{S}}_2:$ Plaster of Paris can be re-obtained by hydration of 'dead plaster".
${\mathrm{S}}_3:$ Gypsum loses $\frac{3}{2}$ of its water of crystallisation forming plaster of Paris at $120°\mathrm{C}$

${\mathrm{S}}_4:$ Plaster of Paris can be obtained by partial oxidation of gypsum.

And arrange in the order of true/false.
 

Select the correct statement with respect to the deep blue solution of an alkali metal in liquid ammonia.

Freshly prepared pure dilute solution of sodium in liquid ammonia:
 

Which of the following statement(s) is/are correct$?$
 

Select correct statement(s):