CIE Chemistry (US-0439): Specimen Questions with Answers 63 - 64 of 240

Question number: 63

MCQ▾

Question

Which information about carbon dioxide and methane is correct?

key

Choices

Choice (4) Response

a.

Image for carbon dioxide and methane:Choice A

Image for Carbon Dioxide and Methane: Choice A

Image for carbon dioxide and methane

b.

Image for carbon dioxide and methane:Choice B

Image for Carbon Dioxide and Methane: Choice B

Image for carbon dioxide and methane

c.

Image for carbon dioxide and methane:Choice C

Image for Carbon Dioxide and Methane: Choice C

Image for carbon dioxide and methane

d.

Image for carbon dioxide and methane:Choice D

Image for Carbon Dioxide and Methane: Choice D

Image for carbon dioxide and methane

Answer

b.

Explanation

Correct option is B i. e. greenhouse effect because The greenhouse effect happens when certain gases—known as greenhouse gases—collect in Earth’s atmosphere. These gases include carbon dioxide , methane, nitrous oxide , fluorinated gases, and ozone. … Animals and plants release carbon dioxide when they respire, or breathe.

Question number: 64

MCQ▾

Question

What are the causes of acid rain?

Choices

Choice (4) Response

a.

Pollution by industries

b.

Internal Combustion engines

c.

Burning of fossil fuels

d.

All a. , b. and c. are correct

Answer

d.

Explanation

  • The causes of acid rain are internal Combustion engines, pollution by industries and burning of fossil fuels. These release oxides of nitrogen, sulphur etc.

  • These oxides combine with the water vapours in the atmosphere to lower the pH of rain water and cause acid rain.