IGCSE Chemistry: Specimen Questions with Answers 171 - 172 of 240

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Question 171

Question

MCQ▾

Which of the following is not true about the modern periodic table?

Choices

Choice (4)

a.

It cannot accommodate the isotopes.

b.

It is based on the increasing atomic number of elements.

c.

It gives information about the electronic configuration of the elements.

d.

All of the above

Answer

b.

Explanation

Since the modern periodic table is based on the increasing atomic number and not atomic mass, therefore the problem of Mendeleev՚s periodic table regarding accommodation of the isotopes was solved. No matter whatever the atomic mass is, the atomic number stays the same for all the isotopes of a particular element. Hence isotopes are accommodated in the modern periodic table.

Question 172

Question

MCQ▾

The organic compound Methyne is not possible because:

Choices

Choice (4)

a.

Methyne is highly poisonous.

b.

Methyne has 1 carbon atom.

c.

Methyne is highly unstable.

d.

It is very difficult to extract methyne from the ores.

Answer

b.

Explanation

  • Methyne has the prefix ‘Meth’ which means that the compound has carbon atom. “yne” suffix is used for alkyne family. An alkyne has carbon-carbon triple covalent bond.
  • So atleast carbon atoms are required for carbon-carbon triple covalent bond. But methyne has only carbon atom.
  • Hence triple bond between carbon atoms is not possible. Thus methyne is not possible because methyne has carbon atom.

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