IGCSE Chemistry Paper-1: Specimen Questions with Answers 73 - 74 of 99

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In the below questions. Complete the following puzzle.

Complete the puzzle above

Complete the Puzzle Above

Question number: 73 (4 of 6 Based on Passage) Show Passage

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Question

ACROSS: At position 49, an inert monatomic gas with atomic no 10.

Choices

Choice (4)Response

a.

Argon

b.

Helium

c.

Krypton

d.

Neon

Answer

d.

Explanation

Neon is a chemical element with symbol Ne and atomic number 10. It is in group 18 of the periodic table. Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air.

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Completed Puzle Given in the Question

Question number: 74 (5 of 6 Based on Passage) Show Passage

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

Choices

Choice (4)Response

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.

Completed Puzle given in the question

Completed Puzle Given in the Question

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