Chemistry
Rita was given an unknown salt for identification. She prepared a solution of the salt and divided it into two parts.
- To the first part of the salt solution, she added a few drops of ammonium hydroxide and obtained a reddish-brown precipitate.
- To the second part of the salt solution, she added a few drops of silver nitrate solution and obtained a white precipitate.
Name:
(a) the cation present and
(b) the anion present in the salt given for identification.
Answer
(a) The cation present is Ferric (Fe3+).
Reason — A reddish-brown precipitate with ammonium hydroxide indicates the presence of Ferric ions. When ammonium hydroxide is added to a solution containing Fe3+ ions, a reddish-brown precipitate of Ferric hydroxide forms.
(b) The anion present is Chloride (Cl-).
Reason — A white precipitate with silver nitrate suggests the presence of Chloride ions (Cl-). Silver nitrate reacts with chloride ions to form a white precipitate of silver chloride (AgCl).
Related Questions
Arrange the following as per the instructions given in the brackets:
(a) Carbon, Fluorine, Beryllium (decreasing order of atomic size)
(b) Sulphuric acid, Phosphoric acid, Acetic acid (increasing order of number of replaceable H atoms per molecule)
(c) Potassium, Lithium, Sodium (increasing order of ionization potential)
Identify the following:
(a) An element in period 1 which can be placed in both group 1 and group 17 of the Periodic Table.
(b) The element having electronic configuration 2, 8, 6.
(c) The most electronegative element of period 3.
Fill in the blanks by choosing the correct answer from the bracket
(a) Carbon tetrachloride is a …………… [polar / non-polar] covalent molecule.
(b) During electrolysis of acidulated water, the gas liberated at the anode is …………… [oxygen / hydrogen].
Ammonia burns in oxygen as shown below.
4NH3 + 3O2 ⟶ 2N2 + 6H2O
If 240 cc of ammonia is burnt in 300 cc of oxygen, find out the composition of the resultant gaseous mixture at room temperature.