IGCSE Chemistry Paper-1: Specimen Questions with Answers 49 - 50 of 99

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Question 49

Question

MCQ▾

Which two gases are formed when electrolysis of water is carried out?

Electrolysis of Water

Choices

Choice (4)

a.

Hydrogen and Oxygen

b.

Oxygen and nitrogen

c.

Hydrogen and Nitrogen

d.

Hydrogen and Carbon di oxide

Answer

a.

Explanation

Water ionises to produce hydrogen (H + ) ions and hydroxide (OH¯) ions. These are often displaced from solution to give hydrogen gas and oxygen gas. The substance formed at the cathode is usually hydrogen, unless the solution contains copper or silver ions, in which case, copper or silver will form at the cathode.

Question 50

Question

MCQ▾

Which among the below is example of double covalent molecular structure?

Choices

Choice (4)

a.

Structure of Chlorine Bonding

b.

Structure of Nitrogen Bonding

c.

Structure of Oxygen Bonding

d.

Question does not provide sufficient data or is vague

Answer

c.

Explanation

Double bond is formed by the sharing of two pairs of electrons of the valence shell.

‎Example: Oxygen molecule (O = O)

‎The atomic number of oxygen is 8. It requires two electrons to achieve the nearest stable inert gas configuration, which is neon. To achieve this, two oxygen atoms contribute two unpaired electrons to produce two bond pairs. Thus, they share these two electron pairs to form a double bond.

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