IGCSE Chemistry Paper-1: Specimen Questions with Answers 69 - 71 of 99
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Question 69
Question
MCQ▾An oxidation reaction takes place when copper powder kept in a china plate is heated. A black coating is formed on the surface of copper. What product is formed in the above reaction?
Choices
| Choice (4) | |
|---|---|
a. | Copper sulphate |
b. | Copper oxide |
c. | Copper Nitrate |
d. | All of the above |
Answer
b.Explanation
Following reaction will take place when copper will be heated.
2Cu + O2 2CuO
Therefore copper oxide is formed.
Passage
In the below questions. Complete the following puzzle.
Question 70 (1 of 6 Based on Passage)
Question
MCQ▾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.
Question 71 (2 of 6 Based on Passage)
Question
MCQ▾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 fertilizers, nitric acid, nylon, dyes and explosives. A colorless, odorless gas. Its electronic configuration is 1s2 2s2 2p3
Hence period = 2 + 3 = 5A
