Chemistry - Study Mode

[#886] Which one of the following statement is correct ? Ozone is found in the earth's atmosphere mostly between
Correct Answer

(C) 20 and 50 km

Explanation

Solution: Ozone is found in the earth's atmosphere mostly between 20 and 50 km.

[#887] Which one of the following is not a ‘green house gas’ ?
Correct Answer

(D) Nitrogen

Explanation

Solution: Nitrogen is not a ‘green house gas’.

[#888] Green house effect is accelerated by
Correct Answer

(D) All of these

Explanation

Solution: Earth's natural greenhouse effect is critical to supporting life, and initially was a precursor to life moving out of the ocean onto land. Human activities, however, mainly the burning of fossil fuels and clearcutting of forests, have accelerated the greenhouse effect and caused global warming.

[#889] Smoke is formed due to
Correct Answer

(A) Solid dispersed in gas

Explanation

Solution: Smoke is a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion or pyrolysis, together with the quantity of air that is entrained or otherwise mixed into the mass. It is commonly an unwanted by-product of fires (including stoves, candles, oil lamps, and fireplaces), but may also be used for pest control (cf. fumigation), communication (smoke signals), defensive and offensive capabilities in the military (smokescreen), cooking (smoked salmon), or smoking (tobacco, cannabis, etc.). Smoke inhalation is the primary cause of death in victims of indoor fires. The smoke kills by a combination of thermal damage, poisoning and pulmonary irritation caused by carbon monoxide, hydrogen cyanide and other combustion products.

[#890] The name of unreactive gas is
Correct Answer

(C) Nitrogen

Explanation

Solution: Nitrogen is chemically unreactive because it has a strong triple bond which binds the two nitrogen atoms together making it harder for it to be broken. It does not burn, and at ordinary temperatures it does not react with other elements.