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Maharashtra SSC (Class 10) Unit 4A2: Net Ionic Equations and Balancing — practice questions

Explore 4 free Unit 4A2: Net Ionic Equations and Balancing questions in Maharashtra SSC (Class 10) Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 4A2: Net Ionic Equations and Balancing questions and exercises with answers

Showing questions 1–4 of 4.

Identify the reaction that is exothermic:Read the answer and worked solution →In the reaction 2Ag$_2$O $\longrightarrow$ 4Ag + O$_2\uparrow$, the silver in Ag$_2$O is:Read the answer and worked solution →In the reaction 2H$_2$S + SO$_2$ $\longrightarrow$ 3S$\downarrow$ + 2H$_2$O, which reactant acts as the oxidant?Read the answer and worked solution →To prevent rusting, iron sheets are commonly protected by applying a layer of which metal?Read the answer and worked solution →

Worked practice questions

Identify the reaction that is exothermic:

  1. CaO + H$_2$O $\longrightarrow$ Ca(OH)$_2$ + heat
  2. 2KClO$_3$(s) $\longrightarrow$ 2KCl(s) + 3O$_2\uparrow$
  3. CaCO$_3$(s) $\longrightarrow$ CaO(s) + CO$_2\uparrow$
  4. CaCO$_3$ + heat $\longrightarrow$ CaO + CO$_2$
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Correct answer: A. CaO + H$_2$O $\longrightarrow$ Ca(OH)$_2$ + heat

1. An exothermic reaction shows heat released on the product side. 2. In CaO + H$_2$O $\longrightarrow$ Ca(OH)$_2$ + heat, 'heat' appears with the products, so heat is given out, making it exothermic. 3. The two decompositions (KClO$_3$ and CaCO$_3$ giving CaO + CO$_2$) require heating, i.e. heat taken in, hence endothermic. 4. The reaction written with 'heat' as a reactant absorbs heat and is also endothermic. _Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 3 "Chemical Reactions and Equations", p.55_

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In the reaction 2Ag$_2$O $\longrightarrow$ 4Ag + O$_2\uparrow$, the silver in Ag$_2$O is:

  1. reduced, as it gains electrons from oxygen
  2. oxidised, as it loses hydrogen
  3. oxidised, as it gains oxygen
  4. reduced, as it loses oxygen
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Correct answer: D. reduced, as it loses oxygen

1. Silver oxide Ag$_2$O breaks down, and the oxygen leaves as O$_2$ gas. 2. The silver loses its oxygen to become free Ag metal. 3. Loss of oxygen is reduction, so the silver is reduced in this decomposition. 4. The 'oxidised' options are the opposite, the hydrogen option is wrong since no hydrogen is present, and the electron-gain wording does not fit this oxygen-loss case. _Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 3 "Chemical Reactions and Equations", p.55_

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In the reaction 2H$_2$S + SO$_2$ $\longrightarrow$ 3S$\downarrow$ + 2H$_2$O, which reactant acts as the oxidant?

  1. SO$_2$
  2. H$_2$S
  3. H$_2$O
  4. S
Show answer and solution

Correct answer: A. SO$_2$

1. H$_2$S loses hydrogen (forming H$_2$O and S), so H$_2$S is oxidised and acts as the reductant. 2. The oxidant is the species that causes this oxidation while being reduced itself. 3. SO$_2$ loses oxygen (it becomes S), i.e. it is reduced, so SO$_2$ is the oxidant. 4. S and H$_2$O are products, not the reacting agents, and H$_2$S is the reductant, not the oxidant, so those options are wrong. _Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 3 "Chemical Reactions and Equations", p.52_

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