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Karnataka SSLC (Class 10) Chemical Reactions and Equations — practice questions

Explore 16 free Chemical Reactions and Equations questions in Karnataka SSLC (Class 10) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Chemical Reactions and Equations questions and exercises with answers

Showing questions 1–16 of 16.

A chemical equation is balanced to obey the law ofRead the answer and worked solution →A reaction in which two or more reactants combine to form a single product is aRead the answer and worked solution →A reaction that releases heat energy to the surroundings is described asRead the answer and worked solution →The breaking down of a single compound into two or more substances is aRead the answer and worked solution →In the balanced equation $3Fe + 4H_2O \rightarrow Fe_3O_4 + xH_2$, the value of $x$ isRead the answer and worked solution →The decomposition of silver chloride into silver and chlorine in sunlight is aRead the answer and worked solution →When an iron nail is dipped in copper sulphate solution, the reaction that occurs is aRead the answer and worked solution →In a chemical reaction, the gain of oxygen by a substance is calledRead the answer and worked solution →In the reaction $CuO + H_2 \rightarrow Cu + H_2O$, the substance that is reduced isRead the answer and worked solution →The development of a black coating on silver articles left in air is an example ofRead the answer and worked solution →The unpleasant smell and taste developed in oily foods left exposed for long is calledRead the answer and worked solution →The decomposition of water into hydrogen and oxygen on passing electric current is calledRead the answer and worked solution →Respiration, in which glucose combines with oxygen to release energy, is best described as a(n)Read the answer and worked solution →A reducing agent in a redox reaction is the substance thatRead the answer and worked solution →Sort the reactionsRead the answer and worked solution →Exothermic or endothermicRead the answer and worked solution →

Worked practice questions

A chemical equation is balanced to obey the law of

  1. conservation of mass
  2. conservation of energy
  3. constant proportions
  4. multiple proportions
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Correct answer: A. conservation of mass

1. In a reaction, atoms are only rearranged, never created or destroyed. 2. So the total mass of reactants equals that of products — the **law of conservation of mass**. 3. Balancing makes the number of atoms of each element equal on both sides. _Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch1 'Chemical Reactions and Equations', §1.1.2_

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A reaction in which two or more reactants combine to form a single product is a

  1. decomposition reaction
  2. combination reaction
  3. displacement reaction
  4. double displacement reaction
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Correct answer: B. combination reaction

1. When several substances join to give one product, it is a combination reaction. 2. Example: CaO + H₂O → Ca(OH)₂. 3. The reverse, one reactant giving many products, is decomposition. _Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch1 'Chemical Reactions and Equations', §1.2_

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A reaction that releases heat energy to the surroundings is described as

  1. endothermic
  2. reversible
  3. exothermic
  4. photochemical
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Correct answer: C. exothermic

1. Reactions that give out heat warm their surroundings. 2. Such reactions are **exothermic** (e.g. burning, respiration). 3. Endothermic reactions instead absorb heat. _Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch1 'Chemical Reactions and Equations', §1.2_

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