NCERT Class X Science Class: Chapter –1. Chemical Reactions and Equations – Part-2

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Question 6:

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?

  1. is an oxidising agent, it oxidises

  2. acts as an oxidising agent and oxidises

  3. The colour disappears due to dilution; no reaction is involved

  4. is an unstable compound and decomposes in presence of to a colour less compound.

Answer: A

Image KMnO 4 as oxidising agent- oxidises FeSO 4

Image KMnO 4 as Oxidising Agent- Oxidises FeSO 4

Question 7:

Which among the following is /are double displacement reactions?

  1. (i) and (iv)

  2. (ii) only

  3. (i) and (ii)

  4. (iii) and (iv)

Answer: B

Image double displacement reaction

Image Double Displacement Reaction

Question 8:

Which among the following statements is/are true? Exposure of silver chloride to sunlight for a long duration turns grey due to

  1. The formation of silver by decomposition of silver chloride

  2. Sublimation of silver chloride

  3. Decomposition of chlorine gas from silver chloride

  4. Oxidation of silver chloride

  5. (i) only

  6. (i) and (iii)

  7. (ii) and (iii)

  8. (iv) only

Answer: A

Image formation and decomposition of silver chloride

Image Formation and Decomposition of Silver Chloride

Question 9:

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is/are true about slaking of lime and the solution formed?

  1. It is an endothermic reaction

  2. It is an exothermic reaction

  3. The pH of the resulting solution will be more than seven

  4. The pH of the resulting solution will be less than seven

  5. (i) and (ii)

  6. (ii) and (iii)

  7. (i) and (iv)

  8. (iii) and (iv)

Answer: B

Question 10:

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

  1. Displacement reaction

  2. Precipitation reaction

  3. Combination reaction

  4. Double displacement reaction

  5. (i) only

  6. (ii) only

  7. (iv) only

  8. (ii) and (iv)

Answer: D

Barium chloride and ammonium sulphate

Barium Chloride and Ammonium Sulphate

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