IGCSE Chemistry: Specimen Questions with Answers 176 - 179 of 240

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Question 176

Question

MCQ▾

The concept of using electricity to bring about a chemical change was first used by ________.

Choices

Choice (4)

a.

Charles E. Michel

b.

Isaac Newton

c.

John Myers

d.

Joseph Priestly

Answer

a.

Explanation

  • The concept of ‘electrolysis’ was first used by Charles E. Michel, an eye doctor. A patient came to Dr. Michel to remove painful inward growing eye lashes. He used electricity to remove those eyelashes.
  • It was the first time that electricity was used to bring about a chemical change. The process that he had used was ‘electrolysis’ .

Question 177

Question

MCQ▾

In a group, elements have the same:

Choices

Choice (4)

a.

Number of valence electrons

b.

Electronic configuration

c.

Oxidation states

d.

Atomic radii

Answer

a.

Explanation

Elements in a group have the same number of valence electrons and the number of valence electrons is even reflected in their group number.

Question 178

Question

MCQ▾

The elements of which groups are non metallic in nature?

Choices

Choice (4)

a.

b.

c.

d.

Answer

b.

Explanation

The elements of groups and accept electrons respectively to complete their octet. Hence they are non metallic in nature.

Question 179

Write in Short

Short Answer▾

The structures of five atoms, A, B, C, D, and E, are shown below.

Structures of Five Atoms

Answer the following questions about these structures. Each structure can be used once, more than once or not at all.

Which structure has a proton (atomic) number of ? …

Explanation

Correct option is C because C option represent metal name Lithium and lithium has electron, proton and neutron

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