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.
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(a) Hydrogen
(b) Sulphur
(c) Chlorine
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.
(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).
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].
(a) Carbon tetrachloride is a non-polar covalent molecule.
(b) During electrolysis of acidulated water, the gas liberated at the anode is oxygen .