Question 14 Marks
When a more reactive element displaces a less reactive element from its compound, it is called a displacement reaction. The reaction is of two types. Single displacement reaction and double displacement reaction.
Iron being more reactive than copper displaces copper from an aqueous solution of copper sulphate. This is an example of a single displacement reaction.
On adding silver nitrate solution to sodium bromide, a yellow ppt of silver bromide and solution of sodium nitrate is formed. This is an example of a double displacement reaction.
i. When dil. sulphuric acid is added to pieces of iron sulphide, hydrogen sulphide gas is produced and soluble ferrous sulphate is formed. Which chemical reaction is involved in this process?
ii. Mention reaction which is used for the preparation of oxygen gas in the laboratory.
iii. What are the products formed in the double displacement reaction discussed below?
OR
Which elements displace aluminum from its salt?
Iron being more reactive than copper displaces copper from an aqueous solution of copper sulphate. This is an example of a single displacement reaction.
On adding silver nitrate solution to sodium bromide, a yellow ppt of silver bromide and solution of sodium nitrate is formed. This is an example of a double displacement reaction.
i. When dil. sulphuric acid is added to pieces of iron sulphide, hydrogen sulphide gas is produced and soluble ferrous sulphate is formed. Which chemical reaction is involved in this process?
ii. Mention reaction which is used for the preparation of oxygen gas in the laboratory.
iii. What are the products formed in the double displacement reaction discussed below?
OR
Which elements displace aluminum from its salt?
Answer
View full question & answer→i. Double displacement reaction
ii. $2 \mathrm{KClO}_{3} \xrightarrow[\text { Catalyst }]{\text { Heat }} 2 \mathrm{KCl}(\mathrm{s})+3 \mathrm{O}_{2}(\mathrm{~g})$
It is a decomposition reaction and endothermic in nature.
iii. Barium Sulphate, Sodium Chloride
OR
Ca elements displace aluminium from its salt.
ii. $2 \mathrm{KClO}_{3} \xrightarrow[\text { Catalyst }]{\text { Heat }} 2 \mathrm{KCl}(\mathrm{s})+3 \mathrm{O}_{2}(\mathrm{~g})$
It is a decomposition reaction and endothermic in nature.
iii. Barium Sulphate, Sodium Chloride
OR
Ca elements displace aluminium from its salt.