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

 Completed Puzle given in the question

Completed Puzle Given in the Question

Names of the gases completed asked in the question

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

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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

Question number: 75 (6 of 6 Based on Passage) Show Passage

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Question

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

Choices

Choice (4) Response

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

Names of the gases completed asked in the question