Question

13. Salts M, N, O, P and Q undergo reactions (i) to
(v) respectively.
Identify the cation present in these salts on the
-), basis of these reactions
. Tabulate your answer in
the format given below.
1. When sodium hydroxide solution is added to
the salt M, and heated strongly a colourless
gas with a pungent smell is evolved which
turns red litmus paper blue and gives dense
white fumes with a moist glass rod with
hydrochloric acid.
2. Addition of dilute hydrochloric acid to a
solution of N gives a thick white precipitate
which is soluble in hot water.
3. When ammonium hydroxide solution is added
to the solution of 0 a light blue precipitate is
obtained which is soluble in excess of
ammonium hydroxide to form an intense deep
blue solution.
4. When ammonium hydroxide solution is added
to the solution of P reddish brown (mustard
colour) precipitate is obtained which is
insoluble even in the excess of ammonium
hydroxide solution.
5. When sodium hydroxide solution is added to
the solution of Q a which coloured gelatinous
precipitate is obtained which is soluble in excess
of sodium hydroxide to form a clear solution
Salt
Cation
N
о
P
Q
1
2
2
2
​

Answer 1

Explanation:

13. Salts M, N, O, P and Q undergo reactions (i) to

(v) respectively.

Identify the cation present in these salts on the

-), basis of these reactions

. Tabulate your answer in

the format given below.

1. When sodium hydroxide solution is added to

the salt M, and heated strongly a colourless

gas with a pungent smell is evolved which

turns red litmus paper blue and gives dense

white fumes with a moist glass rod with

hydrochloric acid.

2. Addition of dilute hydrochloric acid to a

solution of N gives a thick white precipitate

which is soluble in hot water.

3. When ammonium hydroxide solution is added

to the solution of 0 a light blue precipitate is

obtained which is soluble in excess of

ammonium hydroxide to form an intense deep

blue solution.

4. When ammonium hydroxide solution is added

to the solution of P reddish brown (mustard

colour) precipitate is obtained which is

insoluble even in the excess of ammonium

hydroxide solution.

5. When sodium hydroxide solution is added to

the solution of Q a which coloured gelatinous

precipitate is obtained which is soluble in excess

of sodium hydroxide to form a clear solution

Salt

Cation

N

о

P

Q

1

2

2

2