IGCSE Chemistry: Specimen Questions with Answers 215 - 217 of 240

Question number: 215

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MCQ▾

Question

Fluorine is at the top of Group VII in the Periodic Table.

Which row shows the properties of fluorine?

Choices

Choice (4) Response

a.

Table showing properties of fluorine:Choice A

Table Showing Properties of Fluorine: Choice A

Table showing properties of fluorine

b.

Table showing properties of fluorine:Choice B

Table Showing Properties of Fluorine: Choice B

Table showing properties of fluorine

c.

Table showing properties of fluorine:Choice C

Table Showing Properties of Fluorine: Choice C

Table showing properties of fluorine

d.

Table showing properties of fluorine:Choice D

Table Showing Properties of Fluorine: Choice D

Table showing properties of fluorine

Answer

c.

Explanation

Correct option is C i. e. yellow color, gas at room temperature and iodine displaced when react with aqueous potassium iodide. is the reaction Color, physical state is as given in figure

Image for Color of fluorine

Image for Color of Fluorine

Image for Color of fluorine

Question number: 216

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MCQ▾

Question

Ozone layer is very important for us because ________.

Choices

Choice (4) Response

a.

It keeps the earth warm.

b.

The protects earth from UV rays

c.

It allows the sun rays to enter the earth.

d.

All of the above

Answer

b.

Explanation

Ozone layer is very important for us because it protects the earth from harmful UV rays from the sun.

Question number: 217

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Short Answer Question▾

Write in Short

Malonic acid is a white crystalline solid which is soluble in water. It melts at 135 °C. The structural formula of malonic acid is given below. It forms salts called malonates

Or

  1. How could you determine if a sample of malonic acid is pure?

result if pure [2 Marks]

Explanation

If malonic acid is pure then it starts melting else it will not.