IGCSE Chemistry: Specimen Questions with Answers 231 - 234 of 240

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Question 231

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Short Answer▾

The table shows some physical properties of the Group VII elements.

Some Physical Properties of the Group VII Elements

Suggest a value for the atomic radius of fluorine.

Explanation

Atomic radius of fluorine is because it has electronegativity about .

Question 232

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Substances can be classified as:

Elements can be divided into:

Classify each of the following as either an element, compound or mixture.

brass . [1 Marks]

Explanation

Brass is a mixture of the elements of copper and zinc. Bronze is a mixture of copper and tin. Water is a compound of the elements hydrogen and oxygen.

Question 233

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Short Answer▾

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 234

Question

MCQ▾

Mustard Oil is an example of a/an ________.

Choices

Choice (4)

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.

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