IGCSE Chemistry Paper-1: Specimen Questions with Answers 70 - 72 of 99
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In the below questions. Complete the following puzzle.
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Question number: 70 (1 of 6 Based on Passage) Show Passage
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
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Question number: 71 (2 of 6 Based on Passage) Show Passage
MCQ▾
Question
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.
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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.
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