Tag: chemistry

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Multiple choice chemistry preparation of gases nitrogen gas component of air - nitrogen nitrogen

Density of nitrogen gas prepared from air is slightly greater than that of nitrogen prepared by chemical reaction from a compound of nitrogen, because aerial nitrogen contains: 

  1. $CO _2$

  2. Argon
  3. some $N _2$ molecules analogous to $O _2$
  4. greater amount of $N _2$ molecules derived from $N-15$ isotope
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The density of nitrogen gas prepared from the air is slightly greater than that of nitrogen prepared by chemical reaction from a compound of nitrogen, because aerial nitrogen contains a greater amount of $\displaystyle N _2$ molecules derived from $\displaystyle N-15$ isotope.
Note: Molecules containing $\displaystyle N-15$ isotope are heavier than molecules containing$\displaystyle N-14$ isotope as N atom has more number of neutrons.

Multiple choice chemistry preparation of gases nitrogen gas component of air - nitrogen nitrogen

Which of the following gives nitrogen on thermal decomposition?

  1. Ammonium nitrite

  2. Ammonia

  3. Ammonium dichromate

  4. Air
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Explanation

$ { { (NH } _{ 2 }) } _{ 2 }{ Cr } _{ 2 }{ O } _{ 7 }\xrightarrow [ thermal\quad decomposition ]{ \Delta  } { Cr } _{ 2 }{ O } _{ 3 }+{ N } _{ 2 }+4{ H } _{ 2 }O\ N{ H } _{ 4 }{ NO } _{ 2 }\xrightarrow [ thermal\quad decomposition ]{ \Delta  } { N } _{ 2 }+2{ H } _{ 2 }O $

Ammonium nitrite and Ammonium dichromate both give nitrogen on thermal decomposition.

Multiple choice chemistry rocks and minerals coal petroleum non-renewable sources of energy

Which of the following products obtained by destructive distillation of coal, is not properly matched?

  1. Coal tar - dyes, explosives, paints

  2. Coal gas - fuel

  3. Coke - drinking purposes

  4. Ammoniacal liquor - fertilizers
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Coke obtained by destructive distillation of coal is not used for drinking purposes. But it is largely used as a reducing agent in the extraction of metals from their ores.

Multiple choice chemistry rocks and minerals coal petroleum non-renewable sources of energy

Natural gas is primarily ________.

  1. ethane

  2. acetylene

  3. ethene

  4. methane
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Natural gas is a naturally occurring hydrocarbon gas mixture consisting primarily of methane, but commonly including varying amounts of other higher alkanes, and sometimes a small percentage of carbon dioxide, nitrogen, hydrogen sulfide, or helium.

Multiple choice chemistry rocks and minerals coal petroleum non-renewable sources of energy

Petroleum was formed from organisms:

  1. living on the land

  2. living on the plants

  3. living in the sea

  4. living on the rocks
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Petroleum is formed from dead organic matter. When a large amount of dead organism, usually zooplankton and algae are buried underneath sedimentary rock and subjected to intense heat and pressure after such a process the molecule turn into petroleum.Zooplankton is organism found in ocean and seas. This organism can't be found on land, on the rock, on the plant. So option "C "is the right answer.