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

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

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MCQ▾

Question

TOP TO DOWN: At position 50, a gas with many industrial applications, important for plant growth. Belongs to group VA

Choices

Choice (4)

a.

Carbon

b.

Phosphorous

c.

Oxygen

d.

Nitrogen

Answer

d.

Explanation

Nitrogen is important to the chemical industry. It is used to make fertilisers, nitric acid, nylon, dyes and explosives. A colourless, odourless gas. Its electronic configuration is 1s2,2s2,2p3

Hence period = 2+3 = 5A

Completed Puzle given in the question

Completed Puzle Given in the Question

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

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

Choices

Choice (4)

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

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

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Question

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.

Completed Puzle given in the question

Completed Puzle Given in the Question

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