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Chemical Reaction - 3

Description: Chemical Reaction - 3
Number of Questions: 10
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Tags: Chemical Reaction - 3 Chemical Reactions
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What does the delta sign used over an arrow in a chemical equation signify?

  1. Reaction is very slow.

  2. Reaction is very fast.

  3. Reaction is endothermic.

  4. Reaction is exothermic.

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Correct Option: C
Explanation:

The delta sign used over an arrow in a chemical equation signifies that the reaction is endothermic. 

What of the following is true about rusting of iron?

  1. It is temporary.

  2. It is reversible.

  3. New substances are formed.

  4. Composition remains unchanged.

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Correct Option: C
Explanation:

The correct answer is option (3).

Corrosion is a chemical reaction that involves

  1. inside of the object changing from an element to a compound

  2. surface of the object changing from an element to a compound

  3. nothing happens

  4. surface of the object changes from one element into another element

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Correct Option: B
Explanation:

Corrosion is a chemical reaction that involves surface of an object changing from an element to a compound.

The metal which gets coated by a layer of sulphide when exposed to air is

  1. silver

  2. iron

  3. zinc

  4. gold

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Correct Option: A
Explanation:

The correct answer is option (1).

Rusting is a special term, given to the corrosion of which metal?

  1. Zinc

  2. Copper

  3. Nickel

  4. Iron

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Correct Option: D
Explanation:

The correct answer is option (4).

What is rancidification?

  1. Chemical decomposition of fats and other lipids

  2. Oxidation of carbohydrates

  3. Rusting of metals

  4. None of the above

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Correct Option: A
Explanation:

The correct answer is option (1).

Which of the following consist(s) a single covalent bond?

  1. H2

  2. O2

  3. N2

  4. All of the above

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Correct Option: A
Explanation:

The correct answer is option (1).

Which of the following is not an ionic compound?

  1. NaCl

  2. CH4

  3. KCl

  4. MgO

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Correct Option: B
Explanation:

The correct answer is option (2).

The number of electron pairs shared in a triple covalent bond is

  1. 6

  2. 3

  3. 2

  4. none of the above

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Correct Option: B
Explanation:

The correct answer is option (2).

Which of the following compounds/molecules contains triple covalent bond?

  1. Ammonia

  2. Water

  3. Nitrogen

  4. Hydrogen

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Correct Option: C
Explanation:

The correct answer is option (3).

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