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Science Olympiad Test: Chemical Reactions and Equations- 1 - Class 10 MCQ


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10 Questions MCQ Test - Science Olympiad Test: Chemical Reactions and Equations- 1

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Science Olympiad Test: Chemical Reactions and Equations- 1 - Question 1

Which of the following is not a physical change?

Detailed Solution for Science Olympiad Test: Chemical Reactions and Equations- 1 - Question 1

Combustion of LPG (a mixture of propane (C3H8), butane (C4 H10) etc. in liquified form) involves a chemical reaction.

Science Olympiad Test: Chemical Reactions and Equations- 1 - Question 2

When ferrous sulphate crystals are strongly heated, the gas/vapour not evolved are of

Detailed Solution for Science Olympiad Test: Chemical Reactions and Equations- 1 - Question 2

Ferrous sulphate crystals initially lose water of crystallization. Then on strong heating evolve SO2 ​and SO3​.

So, O2 is not involved.

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Science Olympiad Test: Chemical Reactions and Equations- 1 - Question 3

What is the corresponding change in colour when iron nail is dipped in the blue copper sulphate solution?

Detailed Solution for Science Olympiad Test: Chemical Reactions and Equations- 1 - Question 3

When an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solution colour changes from blue to pale green.

Science Olympiad Test: Chemical Reactions and Equations- 1 - Question 4

Which of the following statements about the given reaction are correct?
3 Fe(s) + 4 H2 O(g) → Fe3O4 (s) + 4 H2(g)
(i) Iron metal is getting oxidised
(ii) Water is getting reduced
(iii) Water is acting as reducing agent
(iv) Water is acting as oxidising agent.

Detailed Solution for Science Olympiad Test: Chemical Reactions and Equations- 1 - Question 4

Here, oxygen combines with water to get oxidized. Oxygen is removed from water hence, it is getting reduced. Water is providing oxygen and it acts as an oxidizing agent.

  • On introducing two molecules to each other, one molecule loses an electron. This reaction is called oxidation.
  • On introducing two molecules to each other, one molecule gains an electron. This reaction is called reduction.
  • The oxidized substance is called a reduction agent. The reduced substance is called an oxidizing agent.
Science Olympiad Test: Chemical Reactions and Equations- 1 - Question 5

The process of coating iron with zinc is called

Detailed Solution for Science Olympiad Test: Chemical Reactions and Equations- 1 - Question 5

Galvanisation is the process of coating iron with zinc in order to prevent its rusting.

Science Olympiad Test: Chemical Reactions and Equations- 1 - Question 6

Which of the following gases can be used for storage of fresh sample of an oil for a long time?

Detailed Solution for Science Olympiad Test: Chemical Reactions and Equations- 1 - Question 6

Nitrogen and helium are inert gases and prevent the oxidation of oil and hence prevent the rancidity.

Science Olympiad Test: Chemical Reactions and Equations- 1 - Question 7

Which of the following metal will react with dilute hydrochloric acid to give out hydrogen gas

Detailed Solution for Science Olympiad Test: Chemical Reactions and Equations- 1 - Question 7

Different metals have different reactivity with acids. Aluminium reacts with dilute hydrochloric acid to give Aluminium chloride and hydrogen. Copper, gold and silver does not react with acids at all.

Science Olympiad Test: Chemical Reactions and Equations- 1 - Question 8

Rancidity is due to

Detailed Solution for Science Olympiad Test: Chemical Reactions and Equations- 1 - Question 8

Rancidity is a very general term and in its most general meaning, it refers to the spoilage of food in such a way that it becomes undesirable for consumption. Food turns rancid when the fats and oils within them get oxidized and the taste and smell of the food change due to this reason.

Science Olympiad Test: Chemical Reactions and Equations- 1 - Question 9

Respiration is

Detailed Solution for Science Olympiad Test: Chemical Reactions and Equations- 1 - Question 9

Respiration is the process in which the cells of an organism obtain energy by combining oxygen and glucose, resulting in the release of carbon dioxide, water, and ATP (energy).

Science Olympiad Test: Chemical Reactions and Equations- 1 - Question 10

A dilute ferrous sulphate solution was 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?

Detailed Solution for Science Olympiad Test: Chemical Reactions and Equations- 1 - Question 10

In this reaction, potassium permanganate (KMnO4) is an oxidizing agent. It oxidises ferrous sulphate to ferric sulphate in the presence of dilute H2SO4.
2KMNO4 + 10FeSO4 + 8H2SO4 → K2SO4 + 2MnSO4 + 5Fe(SO4)3 + 8H2O
The solution is coloured purple because of the KMnO4 and it eventually disappears when all the KMnO4 in the solution is utilized.

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