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 23

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Copper on exposure to air reacts with moisture and ${CO}_{2}$ to develop a green layer which is

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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 24

In exothermic reactions, the reactants

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Foundation Course Chemistry>Chapter 1 - Chemical Reactions And Equations>EXERCISE>Q 25

A_{2} O_{3} + 2 B \to B_{2} O_{3} + 2 A

is an example of

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Foundation Course Chemistry>Chapter 1 - Chemical Reactions And Equations>EXERCISE>Q 26

When washing soda is treated with hydrochloric acid, it gives off a colourless gas with a lot of effervescence. Identify the gas.

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Foundation Course Chemistry>Chapter 1 - Chemical Reactions And Equations>EXERCISE>Q 27

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of reaction involved?

(i) Displacement reaction

(ii) Precipitation reaction

(iii) Combination reaction

(iv) Double displacement reaction

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Foundation Course Chemistry>Chapter 1 - Chemical Reactions And Equations>EXERCISE>Q 28

One mole of metal (Y) was added to

1.0 {dm}^{3}

of

2.0 mol / {dm}^{3}

hydrochloric acid. The metal reacted completely with the acid to form a salt and hydrogen. Which of the following could be metal (Y)?

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Foundation Course Chemistry>Chapter 1 - Chemical Reactions And Equations>EXERCISE>Q 29

When copper turnings are added to silver nitrate solution, a blue coloured solution is formed after sometime. It is because, copper

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

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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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?