IGCSE Chemistry Paper-1: Specimen Questions with Answers 72 - 73 of 99

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Passage

In the below questions. Complete the following puzzle.

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Question 72 (3 of 6 Based on Passage)

Question

MCQ▾

ACROSS: At position 48, a versatile element found in many different chemical compounds.

Choices

Choice (4)

a.

Nitrogen

b.

Hydrogen

c.

carbon

d.

Oxygen

Answer

c.

Explanation

Carbon is a chemical element with symbol C and atomic number 6. On the Periodic table, it is the first of six elements in column 14, which have in common the composition of their outer electron shell. Carbon is a versatile element and is found in many different chemical compounds, including those found in space. Carbon is versatile because it can form single, double, and triple bonds. It can also form chains, branched chains, and rings when connected to other carbon atoms.

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Question 73 (4 of 6 Based on Passage)

Question

MCQ▾

ACROSS: At position 46, an element with atomic number 6.

Choices

Choice (4)

a.

Nitrogen

b.

Neon

c.

Silicon

d.

Oxygen

Answer

d.

Explanation

Carbon is a chemical element with symbol and atomic number . On the Periodic table, it is the first (row 2) of six elements in column (group) 14, which have in common the composition of their outer electron shell. It is nonmetallic and tetravalent — making four electrons available to form covalent chemical bonds.

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