Identify the substance that is oxidised and reduced in the following reaction- MnO 2 + 4 HCl → MnCl 2 + 2 H 2 O + Cl 2

In the given reaction, MnO 2 is losing oxygen to form MnCl 2 and HCl is losing hydrogen to form Cl 2 . MnO 2 Manganese dioxide + 4 HCl Hydrochloric acid → MnCl 2 Manganese dichloride + 2 H 2 O Water + Cl 2 Chlorine Therefore, we can conclude- Substance that is oxidised and which is acting as a reducing agent is HCl . Substance that is reduced and which is acting as an oxidising agent is MnO 2 .

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Foundation Course Chemistry>Chapter 1 - Chemical Reactions And Equations>EXERCISE>Q 30

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When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of

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Important Questions on Chemical Reactions And Equations

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Foundation Course Chemistry>Chapter 1 - Chemical Reactions And Equations>EXERCISE>Q 31

A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?

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Foundation Course Chemistry>Chapter 1 - Chemical Reactions And Equations>EXERCISE>Q 32

A dilute solution of sodium carbonate was added to two test tubes - one containing dilute

HCl

(A) and the other containing dilute

NaOH

(B). The correct observation was

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Foundation Course Chemistry>Chapter 1 - Chemical Reactions And Equations>EXERCISE>Q 33

Which of the following species do not show disproportionation reaction?

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Foundation Course Chemistry>Chapter 1 - Chemical Reactions And Equations>EXERCISE>Q 34

In the reaction,

2 H_{2} S + {SO}_{2} \to 3 S + 2 H_{2} O

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Foundation Course Chemistry>Chapter 1 - Chemical Reactions And Equations>EXERCISE>Q 35

Which of the following is true regarding dissolution of

{NH}_{4} Cl

in water?

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Foundation Course Chemistry>Chapter 1 - Chemical Reactions And Equations>EXERCISE>Q 36

In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?

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Foundation Course Chemistry>Chapter 1 - Chemical Reactions And Equations>EXERCISE>Q 37

In the ionic equation :