Advertisements
Advertisements
Question
A metal whose alloy finds use in the construction of aircrafts in the powdered form is added to sodium hydroxide solution. A colourless gas was evolved and after reaction was over, the solution was colourless.
(a) Name the powdered metal added to sodium hydroxide solution.
(b) Name the gas evolved.
(c) Name the salt present in the colorless solution.
Solution
(a) The powdered metal added to sodium hydroxide solution is Aluminium.
(b) The gas evolved is hydrogen .
(c) The salt present in the colorless solution is sodium aluminate (NaAIO2).
Concept Insight:
The alloy of aluminium meta l i.e. duraluminium finds use in
the construction of aircrafts. Reaction of aluminium metal with sodium hydroxide is as:
\[\ce{2Al + 2NaOH + 2H2O -> 2NaAlO2 +3H2}\]
APPEARS IN
RELATED QUESTIONS
Write the probable colour of the following salt:
Cupric salts
Write the probable colour of the following salt:
Calcium salts
Write the probable colour of the following salt:
Iron (III) chloride
Write the colour of the following salt : Ferrous salts.
Write the colour of the following salt : Calcium salts.
On adding dilute ammonia solution to a colourless solution of a salt, a white gelatinous precipitate appears. This precipitate however dissolves on addition of excess of ammonia solution. Identify (Choose from Na, l, Zn, Pb, Fe)
(a) Which metal salt solution was used?
(b) What is the formula of white gelatinous precipitate obtained?
One chemical test that would enable you to distinguish between the following pair of chemicals. Describe what happens with each chemical or state 'no visible reaction'.
Write balanced equation for the following reaction:
Sulphur dioxide and sodium hydroxide solution
(Give the equation for the formation of the normal salt)
Colour of the precipitate formed on adding NaOH solution to iron (II) sulphate solution is ______.
| Abhishek was given a salt 'X' which was white in colour for analysis. On strong heating, it produced a yellow residue, a colourless gas and also a reddish-brown gas. The solution of the salt 'X', when tested with an excess of ammonium hydroxide, produced a chalky white insoluble precipitate. |
- Name the coloured gas that evolved when Abhishek heated the salt strongly.
- Which cation was present in the sample given to Abhishek?
- Identify the salt given to Abhishek for analysis.
