IGCSE Chemistry: Specimen Questions with Answers 88 - 90 of 240
Question number: 88
Question
________ is the branch of chemistry which deals with the compounds derived from non-living sources.
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | Organic chemistry |
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| b. | Inorganic chemistry |
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| c. | None of the above |
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| d. | All of the above |
|
Answer
b.Explanation
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Inorganic chemistry is the branch of chemistry which deals with the compounds derived from non-living sources. The main substituents of the inorganic substances are the inorganic elements such as sodium, potassium, nickel, hydrogen, oxygen etc. Inorganic compounds do not contain carbon.
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For example, sodium sulphate sulphuric acid , etc. are inorganic compounds because they all are derived from non-living sources. These compounds are studied under the branch of chemistry known as inorganic chemistry.
Question number: 89
Question
Number of valence electrons in group is ________.
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 1 |
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| b. | 2 |
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| c. | 3 |
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| d. | 4 |
|
Answer
c.Explanation
Correct option is C because number of valence electron is equal to the group number.
Question number: 90
Write in Short
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.