Chemistry
Assertion (A): Chlorine can displace iodide ions from KI solution.
Reason (R): It is an example of displacement reaction.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Chemical Reaction
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Answer
Both A and R are true but R is not the correct explanation of A.
Explanation — Chlorine is more active non-metal when compared to iodine. In the reactivity series of non-metals, chlorine is placed above iodine. Hence, chlorine displaces iodine from potassium iodide solution. Hence, the assertion (A) is true.
2KI + Cl2 ⟶ 2KCI + I2
Above reaction is displacement reaction in which a more active element chlorine displaces a less active element iodine from its salt solution. Hence the reason (R) is true.
However reason (R) does not explain about reactivity of chlorine and position of chlorine and iodine in reactivity series. Hence reason (R) is not a correct explanation of assertion (A).
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Related Questions
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Reason (R): Decomposition reactions involve the breakdown of a single reactant into simpler products.
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Reason (R): Light provides energy for this endothermic reaction.
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Reason (R): Copper is placed below silver in the activity series.
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Riya was revising different types of chemical reactions studied in class. She recalled that:
A double displacement reaction generally takes place in an aqueous solution where the ions of two compounds exchange places.
If one of the products formed is an insoluble solid, the reaction is called a precipitation reaction.
A reaction in which an acid or acidic oxide reacts with a base or basic oxide to form salt and water is known as a neutralisation reaction.
To understand these reactions better, Riya observed the following experiments.
(a) When hydrogen sulphide gas (H2S) was passed through a blue solution of copper sulphate, a black solid was formed along with sulphuric acid.
(i) Identify the type of reaction taking place.
(ii) Name the black solid formed.(b) Sodium hydroxide reacts with hydrochloric acid to form sodium chloride and water.
Explain why this reaction is considered a double displacement reaction.(c) Complete and balance the following chemical equation ;
Pb(NO3)2 (aq.) + KI ⟶ …… + ……
(d) State one observable change that indicates the reaction in part (c) has taken place.