IGCSE Chemistry Paper-1: Specimen Questions with Answers 73 - 75 of 99

Passage

In the below questions. Complete the following puzzle.

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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 C and atomic number 6. 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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Question 74 (5 of 6 Based on Passage)

Question

MCQ▾

TOP TO DOWN: At position 51, a noble gas belonging to group 18.

Choices

Choice (4)

a.

Krypton

b.

Neon

c.

Argon

d.

Helium

Answer

c.

Explanation

Argon is a chemical element with symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas.

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Question 75 (6 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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