Practice MCQ Questions and answers on Chemistry-GK

The term "coal is a black gold" is just a simple metaphor. Even today, we burn more coal than natural gas, more than nuclear, more than anything.

Naturally occurring mixture of a hydrocarbon gas with methane being the primary constituent is called natural gas. Other gases found in minute traces are hydrogen, hydrogen sulphide, nitrogen, carbon monoxide and carbon dioxide.

The natural resources that get replenished in nature are called as the renewable resources. These are the resources that can be used for unlimited time span and can be replaced naturally such as sunlight, water, air etc.

There are a number of atmospheric gases which make up air. In the lower atmosphere or troposphere, the main gases are nitrogen and oxygen, which make up 78% and 21% of the volume of air respectively. The remaining 1% of the atmospheric gases is made up of trace gases.

The maximum water vapour content in the atmosphere is 3 to 4 per cent.

Nitrification is the process by which ammonia (NH₃) or ammonium (NH₄⁺) is converted to nitrate (NO₃^-).

N₂O is not a green house gas.

Ozone holes are formed in Antarctica and these are due to special clouds that form in the stratosphere called polar stratospheric clouds. Clouds usually do not form in stratosphere, this can happen only at such low temperatures. These clouds accumulate pollutants resulting in formation of ozone holes.

The ozone layer or ozone shield is a region of Earth’s stratosphere that absorbs most of the Sun’s ultraviolet (UV) radiation. It absorbs 97 to 99 percent of the Sun’s medium-frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which otherwise would potentially damage exposed life forms near the surface.

Deforestation is not a cause for present global warming and climate change.