IGCSE Chemistry: Specimen Questions with Answers 235 - 237 of 240

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Question 235

Write in Short

Short Answer▾
  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

Images of Saturated Hydrides

Question 236

Question

MCQ▾

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)

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

Question 237

Question

MCQ▾

While moving down a group in the modern periodic table, the size of an atom of an element ________.

Choices

Choice (4)

a.

Decreases

b.

Partially increases

c.

Increases

d.

All of the above

Answer

c.

Explanation

While moving down a group in the modern periodic table, number of electronic shells of the atoms of the elements increases as a result of which size of the atom increases.

Let us consider group 1 as an example.

Atom Increases

It can be observed that while moving down the group, number of electronic shells increases gradually. As the number of shells increases so the size of the atom increases.

Similarly it can be observed in all other groups that the number of shells increases gradually while moving down the group. So the size of the atom increases while moving down a group.

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