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Question
Consider the following chemical equation I and II
- \[\ce{Mg + 2HCl -> MgCl_2 +H_2}\]
- \[\ce{NaOH +HCl -> NaCl + H_2O}\]
The correct statement about these equations is:
Options
'I' is a displacement reaction and 'II' is a decomposition reaction.
'I' is a displacement reaction and 'II' is double displacement reaction.
Both 'I' and 'II' are displacement reactions.
Both 'I' and 'II' are double- displacement reactions.
Solution
'I' is a displacement reaction and 'II' is double displacement reaction.
Explanation:
\[\ce{Mg(s) + 2HCl(aq) ->MgCl_2(aq) + H_2(g)}\]
Magnesium displaces hydrogen in a chloride molecule in a single displacement reaction because it is more reactive than hydrogen.
\[\ce{NaOH(aq) + HCl(aq) -> NaCl(aq) + H_2O(l)}\]
The reactants in a double displacement reaction exchange ions to create new molecules. The formation of salt (NaCl) and water (HOH) in the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) is an example of a double displacement reaction, more precisely a neutralisation reaction.
RELATED QUESTIONS
Reaction of iron nails with copper sulphate solution is an example of
(a) Combination reaction
(b) Decomposition reaction
(c) Displacement reaction
(d) Double displacement reaction
In the refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal. Write down the reaction involved.
State two characteristics of the chemical reaction which takes place when dilute sulphuric acid is poured over zinc granules.
Why does the colour of copper sulphate solution change when an iron nail is kept immersed in it?
what type of reaction is the following:
Cl2 + 2KI → 2KCl + I2
What happens when a zinc strip is dipped into a copper sulphate solution?
Name the type of reaction involved.
Classify the following reaction into –
- Direct combination
- Decomposition
- Displacement
- Double decomposition
The reaction is – Zinc reacts with copper [II] sulphate to give zinc sulphate and copper.
Give a balanced equation for –
A displacement reaction involving a metal above hydrogen in the activity series with copper [II] sulphate solution
\[\ce{Pb + CuCl2 -> PbCl2 + Cu}\]
The above reaction is an example of:
State the change in colour observed in following case mentioning the reason:
A piece of zinc is dipped in ferrous sulphate solution.
