IGCSE Chemistry: Specimen Questions with Answers 233 - 236 of 240

Question number: 233

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Germanium is an element in Group IV. The electron distribution of a germanium atom is 2 + 8 + 18 + 4. It has oxidation states of + 2 and + 4.

Is the change to reduction, oxidation or neither? Give a reason for your choice.

Explanation

Change from to is oxidation number of it is .

Question number: 234

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Question

Mustard Oil is an example of a/an ________.

Choices

Choice (4) Response

a.

Base

b.

Salt

c.

Acid

d.

All of the above

Answer

a.

Explanation

Mustard Oil is an example of a base. It doesn’t taste sour. So, it is not an acid.

Question number: 235

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  1. Germanium is an element in Group IV. The electron distribution of a germanium atom is 2 + 8 + 18 + 4. It has oxidation states of + 2 and + 4.

    1. Germanium forms a series of saturated hydrides similar to the alkanes.

      1. Draw the structural formula of the hydride which contains three germanium atoms per molecule.

Explanation

Image of Images of saturated hydrides

Image of Images of Saturated Hydrides

Image of Images of saturated hydrides

Question number: 236

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Question

The name of an alkyne having 6 carbon atoms is ________.

[Write the name only without writing the position of the triple bond]

Choices

Choice (4) Response

a.

propyne

b.

butyne

c.

ethyne

d.

hexyne

Answer

d.

Explanation

  • In organic chemistry compounds are named in accordance with the number of carbon atoms present in that compound.

  • Name of the for the number of or

  • Following prefixes are used in the naming of the organic compounds.

Table of the prefix and number of carbon atoms

Table of the Prefix and Number of Carbon Atoms

Table of the prefix and number of carbon atoms

  • Number of carbon atoms in the given alkyne = 6
  • Thus from the above table it can be deduced that 6 carbon atom has the prefix “Hex”.
  • So the name of the given

=

=

Image shows the structure of hexyne

Image Shows the Structure of Hexyne

Image shows the structure of hexyne

  • So the name of an alkyne having carbon atoms is .