Tag: chemistry

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Multiple choice allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

Wood charocal is used in gas masks because it:

  1. has good smell

  2. dissolves poisonous gases

  3. adsorbs poisonous gases

  4. reacts with poisonous gases
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Activated charcoal is a very good adsorbent. It can easily adsorb large volumes of gases easily. Hence it is used in gas masks to adsorb harmful gases. It cannot adsorb oxygen which makes it perfect for gas masks.

Multiple choice allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

In a test tube, a cotton plug was placed and a few drops of bromine liquid were added to it and then a piece of wood charcoal was added to the test tube. Which of the following are observed?

  1. Initially the test tube is filled with brown vapours

  2. Activated wood charcoal absorbs gases

  3. Brown vapours are retained in the test tube

  4. Brown vapours are formed because of wood charcoal
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation
Initially, the test tube filled with brown fumes of bromine. They are absorbed by activated wood charcoal which is a good adsorbent and the test tube becomes transparent.
Multiple choice allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

$C _{12}H _{22}O _{11}\xrightarrow{Conc.   H _2SO _4} 12C+11H _2O$
Which of the following is obtained by the above reaction?

  1. Animal charcoal

  2. Sugar charcoal

  3. Coke

  4. Wood charcoal
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Conc. $H _{2}SO _{4}$ is dehydrating agent. It dehydrates cane sugar to sugar charcoal.

           $C _{12}H _{22}O _{11}\,\,\,\xrightarrow{conc.H _2SO _4}\underset{sugar\ charcoal}{12C}+11H _{2}O$

Multiple choice allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

When superheated steam is passed through white-hot wood charcoal, it gets reduced to a mixture of X and Y and it is named as Z. Identify the mixture Z.

  1. Producer gas

  2. Water gas

  3. Coal gas

  4. Soda water
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$C\xrightarrow{supre\ heated\ H _2O}CO+H _{2}$


When Superheated steam is passed through white-hot wood charcoal it gets reduced to $CO $ and $H _{2}$. 

This mixture is called $water\ gas$.

Multiple choice allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

When superheated steam is passed through white-hot wood charcoal, it gets reduced to a mixture of X and Y and it is named as Z. Identify Y

  1. $CO _2$
  2. $SO _2$
  3. $H _2$
  4. $NO _2$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$C\xrightarrow{supre\ heated\ H _2O}CO+H _{2}$


From the given option Y would be Hydrogen $(H _2)$
Hence, option (C) is correct.

Multiple choice allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

Bone charcoal is prepared by destructive distillation of bones.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Animal charcoal is produced from bones, horn, blood, etc. Bone-black, or bone-charcoal, is obtained by the destructive distillation of bones in iron retorts, the distillate constituting bone- oil or Dippel's oil

Multiple choice allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

When super heated steam is passed through white hot wood charcoal, it gets reduced to a mixture of $X, Y$ and this reaction is named as $Z$. Identify $X$.

  1. $N{O} _{2}$
  2. $CO$
  3. $S{O} _{2}$
  4. $C{O} _{2}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
$X + Y \longrightarrow CO + H _2(water-gas)$
$X = CO$
$Y = H _2$
$XY = water- gas (CO + H _2)$ reaction is exothermic.

$Z$ is known as $ carbonisation$ reaction.
Hence, the correct option is B.

Multiple choice allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

In a test tube, a cotton plug was placed and a few drops of bromine liquid were added to it and then a piece of wood charcoal was added to the test tube. Which of the following are observed?

  1. Initially the test tube is filled with brown vapours

  2. Activated wood charcoal absorbs gases

  3. Brown vapours are retained in the test tube

  4. Brown vapours are formed because of wood charcoal
Reveal answer Fill a bubble to check yourself
A,B Correct answer