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 .

E M B I B E

Foundation Course Chemistry>Chapter 1 - Chemical Reactions And Equations>EXERCISE>Q 42

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Which of the following is not a thermal decomposition reaction?

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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 43

Which of the following combination of reactants will lead to the formation of a reddish brown precipitate?

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Foundation Course Chemistry>Chapter 1 - Chemical Reactions And Equations>EXERCISE>Q 44

Three beakers labelled as A, B and C each containing

25 mL

of water were taken. A small amount of

NaOH

, anhydrous

{CuSO}_{4}

and

NaCl

were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which of the following statement(s) is (are) correct?

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Foundation Course Chemistry>Chapter 1 - Chemical Reactions And Equations>EXERCISE>Q 45

When the ion

{Cr}_{2} {O_{7}}^{2 -}

acts as an oxidant in acidic aqueous solution the ion

{Cr}^{3 +}

is formed. How many moles of

{Sn}^{2 +}

would be oxidised to

{Sn}^{4 +}

by one mole of

{Cr}_{2} {O_{7}}^{2 -}

ions?

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Foundation Course Chemistry>Chapter 1 - Chemical Reactions And Equations>EXERCISE>Q 46

Which is a double displacement as well as a neutralisation reaction?

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Foundation Course Chemistry>Chapter 1 - Chemical Reactions And Equations>EXERCISE>Q 47

Which of the following processes does not involve either oxidation or reduction?

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Foundation Course Chemistry>Chapter 1 - Chemical Reactions And Equations>EXERCISE>Q 48

When sodium hydroxide is added to ferric chloride solution, a reddish brown precipitate is formed. The precipitate is seperated from the mixture by the process of _____.

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Foundation Course Chemistry>Chapter 1 - Chemical Reactions And Equations>EXERCISE>Q 49

Complete the chemical reaction.

${Mg}_{(s)} + H_{2} {SO}_{4_{(aq)}} \to ?$