IGCSE Chemistry: Specimen Questions with Answers 143 - 145 of 240

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Question 143

Question

MCQ▾

According to the general formula of hydrocarbons, the formula of Hexene is ________.

Choices

Choice (4)

a.

b.

c.

d.

Answer

c.

Explanation

  • In Organic chemistry, compounds are named in accordance with the number of carbon atoms present in that compound.
  • Name of the for the number of carbon atoms + ane (for alkane) or
  • Following prefixes are used in the naming of the organic compounds.
Prefix Table in Organic Chemistry
  • From the given formula , Hexene is an alkene. It has the prefix ‘Hex’ and in the above table this prefix stands for 6 carbon atoms. So it has 6 carbon atoms.
  • The general formula of alkene is , where n is the number of carbon atoms.
  • Thus the number of hydrogen atoms in
  • So the formula of the Hexene is given by:

Question 144

Write in Short

Short Answer▾

In the presence of sulfuric acid, hydrogen peroxide reacts with iodide ions to form iodine and water. This involves the reduction of hydrogen peroxide.

Complete the word equation for the reaction of sulfuric acid with calcium hydroxide.

Explanation

.

Question 145

Question

MCQ▾

The Gram Atomic Mass of sodium (Na) is ________.

Choices

Choice (4)

a.

23

b.

11

c.

22

d.

24

Answer

a.

Explanation

  • Standard temperature and pressure (STP) is defined as and 1 atm of pressure. The molar volume of a gas is the volume of one mole of the gas at a given temperature and pressure. At STP, one mole of any gas occupies a volume of
  • Gram Atomic Mass of an element is its Relative Atomic Mass expressed in grams.
1 Mole of a Substance Occupies a Volume

The Relative Atomic Mass of sodium (Na) is so the Gram Atomic Mass of sodium (Na) is

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