Bright Tutorials Bright Tutorials
ICSE Class 10 Chemistry Question 17 of 22

Solved 2024 Question Paper ICSE Class 10 Chemistry — Question 16

Back to all questions
16
Question

Question 6(iv)

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.

Answer

(a) Hydrogen

(b) Sulphur

(c) Chlorine

Question 7(i)

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).

Question 7(ii)

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 .