NCERT Class X Science Class: Chapter –1. Chemical Reactions and Equations – Part-4

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Question 17:

In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?

Answer: D

Figure shown the reactants and products

Figure Shown the Reactants and Products

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Question 18:

Which of the following are combination reactions?

  1. (i) and (iii)

  2. (iii) and (iv)

  3. (ii) and (iv)

  4. (ii) and (iii)

Answer: D

Figure shown the combination reaction

Figure Shown the Combination Reaction

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Short Answer Questions

Question 19:

Write the balanced chemical equations for the following reactions and identify the type of reaction in each case.

  1. Nitrogen gas is treated with hydrogen gas in the presence of a catalyst at to form ammonia gas.

  2. Sodium hydroxide solution is treated with acetic acid to form sodium acetate and water.

  3. Ethanol is warmed with ethanoic acid to form ethyl acetate in the presence of concentrated.

  4. Ethane is burnt in the presence of oxygen to form carbon dioxide, water and releases heat and light.

Answer:

Combination reaction

Double displacement reaction/Neutralisation reaction

Double displacement reaction/Esterification reaction

Redox reaction/Combustion reaction

(a) and (c) are combination reactions, (b) is double displacement reaction and (d) is redox reaction.

Question 20:

Write the balanced chemical equations for the following reactions and identify the type of reaction in each case.

  1. Thermite reaction, iron (III) oxide reacts with aluminium and gives molten iron and aluminium oxide.

  2. Magnesium ribbon is burnt in an atmosphere of nitrogen gas to form solid magnesium nitride.

  3. Chlorine gas is passed in an aqueous potassium iodide solution to form potassium chloride solution and solid iodine.

  4. Ethanol is burnt in air to form carbon dioxide, water and releases heat.

Answer:

It is Displacement reaction/Redox reaction

It is Combination reaction

It is Displacement reaction

It is Redox reaction/Combustion reaction