IGCSE Chemistry Paper-1: Specimen Questions with Answers 70 - 72 of 99

Passage

In the below questions. Complete the following puzzle.

Complete the puzzle above

Complete the Puzzle Above

Find the missing values in the questions.

Question number: 70 (1 of 6 Based on Passage) Show Passage

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MCQ▾

Question

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

Choices

Choice (4) Response

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.

Completed Puzle given in the question

Completed Puzle Given in the Question

Names of the gases completed asked in the question

Question number: 71 (2 of 6 Based on Passage) Show Passage

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Question

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

Choices

Choice (4) Response

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.

 Completed Puzle given in the question

Completed Puzle Given in the Question

Names of the gases completed asked in the question

Question number: 72 (3 of 6 Based on Passage) Show Passage

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MCQ▾

Question

ACROSS: At position 47, a gas with atomic number 3.

Choices

Choice (4) Response

a.

Neon

b.

Helium

c.

Lithium

d.

Argon

Answer

c.

Explanation

Lithium is a chemical element with symbol Li and atomic number 3. It is a soft, silver-white metal belonging to the alkali metal group of chemical elements. Under standard conditions it is the lightest metal and the least dense solid element.

 Completed Puzle given in the question

Completed Puzle Given in the Question

Names of the gases completed asked in the question