IGCSE Chemistry: Specimen Questions with Answers 87 - 88 of 240

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Question 87

Question

MCQ▾

There are two gas jars, each containing of a gas. Both the jars are maintained at same temperature and pressure. The number of gas molecules in 1st jar is . The number of gas molecules in the 2nd jar is ________.

Choices

Choice (4)

a.

81860

b.

71750

c.

61640

d.

51530

Answer

a.

Explanation

  • The given problem is related to the number of molecules and volume of the gas at constant temperature and pressure. So Avogadro՚s Law is used to calculate the number of molecules present in the other gas jar.
  • Avogadro՚s Law states that “equal volumes of all gases under the same conditions of temperature and pressure contain equal number of molecules” .
  • Since both the jars are maintained at same temperature and pressure and they contain the same volume of gases, hence number of molecules in both the jars is equal.
  • Since 1st gas jar has molecules,
  • The number of gas molecules in 2nd jar is also .

Question 88

Question

MCQ▾

________ is the branch of chemistry which deals with the compounds derived from non-living sources.

Choices

Choice (4)

a.

Organic chemistry

b.

Inorganic chemistry

c.

None of the above

d.

All of the above

Answer

b.

Explanation

  • 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.
  • 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.

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