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Occurrence of carbon compounds in nature - class-VIII

Description: occurrence of carbon compounds in nature
Number of Questions: 23
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Tags: occurrence of carbon compounds in nature chemistry
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Wood charocal is used in gas masks because it:

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  1. has good smell

  2. dissolves poisonous gases

  3. adsorbs poisonous gases

  4. reacts with poisonous gases

Show answer
Correct Option: C
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.

In the preparation of wood charcoal, liquid pyroligneous acid is obtained. It consists of :

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  1. acetone

  2. methanol

  3. acetic acid

  4. vinegar

Show answer
Correct Option: A,B,C
Explanation:

In the preparation of the wood charcoal, the liquid pyroligneous acid is used.
Pyroligneous acids contain acetone, methanol, and acetic acid.

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?

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  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

Show answer
Correct Option: A,B
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.

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

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  1. Animal charcoal

  2. Sugar charcoal

  3. Coke

  4. Wood charcoal

Show answer
Correct Option: B
Explanation:

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

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

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.

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  1. Producer gas

  2. Water gas

  3. Coal gas

  4. Soda water

Show answer
Correct Option: B
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 $water\ gas$.

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

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  1. $CO _2$

  2. $SO _2$

  3. $H _2$

  4. $NO _2$

Show answer
Correct Option: C
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.

Bone charcoal is prepared by destructive distillation of bones.

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  1. True

  2. False

Show answer
Correct Option: A
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

Sugar charcoal is prepared by pouring water on sugar syrup.

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

The given statement is false as sugar charcoal is obtained by removing water and some other volatile constituents from the animal and vegetation substances.

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 $X$.

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  1. $N{O} _{2}$

  2. $CO$

  3. $S{O} _{2}$

  4. $C{O} _{2}$

Show answer
Correct Option: B
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.

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?

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  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

Show answer
Correct Option: A,B

Process of conversion of wood into coal by biochemical process, taking over millions of years is called:

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  1. catenation

  2. carbonation

  3. pyrolysis

  4. destructive distillation

Show answer
Correct Option: B
Explanation:

The Process of conversion of wood into coal by biochemical process is known as Carbonization. Coal burns cleaner than wood burning coal was easier because coal burned longer than wood.

Carbonization is the term for the conversion of an organic substance into carbon or a carbon-containing residue through pyrolysis or destructive distillation. It is often used in organic chemistry with reference to the generation of coal gas and coal tar from raw coal.

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 $Y$.

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  1. $C{O} _{2}$

  2. $S{O} _{2}$

  3. ${H} _{2}$

  4. $N{O} _{2}$

Show answer
Correct Option: C
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 C.

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

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  1. Producer gas

  2. Water gas

  3. Coal gas

  4. Soda water

Show answer
Correct Option: B
Explanation:

When super heated steam is passed through hot wood charcoal then reaction takes place as


$C + H _2O \rightarrow CO + H _2$

The combination of $CO$ and $H _2$ is known as water gas.

${ C } _{ 12 }{ H } _{ 22 }{ O } _{ 11 }\xrightarrow { \quad \quad Conc.{ H } _{ 2 }S{ O } _{ 4 }\quad \quad  } 12C+11{ H } _{ 2 }O$
Which of the following is obtained by the above reaction?

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  1. Animal charcoal

  2. Sugar charcoal

  3. Coke

  4. Wood charcoal

Show answer
Correct Option: B
Explanation:

Sugar when treated with con. $H _2SO _4$ it gives carbon as sugar charcoal and water.

${ C } _{ 12 }{ H } _{ 22 }{ O } _{ 11 }\xrightarrow { \quad \quad Conc.{ H } _{ 2 }S{ O } _{ 4 }\quad \quad  } 12C+11{ H } _{ 2 }O$

In the preparation of wood charcoal, liquid pyroligneous acid is obtained. It consists of:

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  1. acetone

  2. methanol

  3. acetic acid

  4. Vinegar

Show answer
Correct Option: A,B,C
Explanation:

In the preparation of wood charcoal, liquid pyroligneous acid is obtained. It consists of acetone, methanol and acetic acid.

 An individual can reduce plastic pollution in the ways like :

allotropes of carbon occurrence of carbon compounds in nature polymers chemistry

  1. Use a reusable container instead of sandwich bags

  2. Bring your own to-go mug with you to the coffee shop

  3. Say no to single serving packaging, buy in bulk and share with friends instead

  4. All of these

Show answer
Correct Option: D
Explanation:
The best thing we can do to protect our waterways is try to keep as much plastic as possible out of the waste stream in the first place. There are many small ways you can have a big impact.

1. Wean yourself off disposable plastics.
Ninety percent of the plastic items in our daily lives are used once and then chucked: grocery bags, plastic wrap, disposable cutlery, straws, coffee-cup lids. Take note of how often you rely on these products and replace them with reusable versions. It only takes a few times of bringing your own bags to the store, silverware to the office, or travel mug to Starbucks before it becomes habit.
2. Stop buying water.
Each year, close to 20 billion plastic bottles are tossed in the trash. Carry a reusable bottle in your bag, and you’ll never be caught having to resort to a Poland Spring or Evian again. If you’re nervous about the quality of your local tap water, look for a model with a built-in filter.
3. Boycott microbeads.
Those little plastic scrubbers found in so many beauty products—facial scrubs, toothpaste, body washes—might look harmless, but their tiny size allows them to slip through water-treatment plants. Unfortunately, they also look just like food to some marine animals. Opt for products with natural exfoliants, like oatmeal or salt, instead.
4. Cook more.
Not only is it healthier, but making your own meals doesn’t involve takeout containers or doggy bags. For those times when you do order in or eat out, tell the establishment you don’t need any plastic cutlery or, for some serious extra credit, bring your own food-storage containers to restaurants for leftovers.
5. Purchase items secondhand.
New toys and electronic gadgets, especially, come with all kinds of plastic packaging—from those frustrating hard-to-crack shells to twisty ties. Search the shelves of thrift stores, neighborhood garage sales, or online postings for items that are just as good when previously used. 
6. Recycle (duh).
It seems obvious, but we’re not doing a great job of it. For example, less than 14 percent of plastic packaging is recycled. Check out the number on the bottom of the container. Most beverage and liquid cleaner bottles will be #1 (PET), which is commonly accepted by most curbside recycling companies. Containers marked #2 (HDPE; typically slightly heavier-duty bottles for milk, juice, and laundry detergent) and #5 (PP; plastic cutlery, yogurt and margarine tubs, ketchup bottles) are also recyclable in some areas. 
7. Support a bag tax or ban.
Urge your elected officials to follow the lead of those in San Francisco, Chicago, and close to 150 other cities and counties by introducing or supporting legislation that would make plastic-bag use less desirable.
8. Buy in bulk.
Single-serving yogurts, travel-size toiletries, tiny packages of nuts—consider the product-to-packaging ratio of items you tend to buy often and select the bigger container instead of buying several smaller ones over time.
9. Bring your own garment bag to the dry cleaner.
Invest in a zippered fabric bag and request that your cleaned items be returned in it instead of sheathed in plastic. (And while you’re at it, make sure you’re frequenting a dry cleaner that skips the perc, a toxic chemical found in some cleaning solvents.)
10. Put pressure on manufacturers.
Though we can make a difference through our own habits, corporations obviously have a much bigger footprint. If you believe a company could be smarter about its packaging, make your voice heard. 

Who influences the plastic pollution the most?

allotropes of carbon occurrence of carbon compounds in nature polymers chemistry

  1. Public

  2. Manufacturer

  3. Government

  4. All of these

Show answer
Correct Option: D
Explanation:
We all share the responsibility for environmental issues like plastic pollution. Any issue which concerns and community, has to be resolved with the co-operation of all involved; it is a "shared responsibility". Those involved are Government, Municipalities, the raw material manufacturers, the retailers, and consumers.
Because domestic waste is a mixture of materials of which plastics is only a small component, under 2% by weight, it is the responsibility of government to manage waste and a regulate its disposal.
It is the responsibility of the plastics raw material and packaging manufacturers to come up with the most cost efficient solutions, which will preserve and protect goods, minimize the use of energy and reduce the weight and volume of waste. 

Which are the ways through which each one of us may reduce plastic pollution?

allotropes of carbon occurrence of carbon compounds in nature polymers chemistry

  1. Use silverware instead of plactic utensils, keep a set at the office, bring a set on a picnic or to the beach

  2. Download your music instead of buying CDs

  3. Seek out items that are not made of plastic

  4. All of these

Show answer
Correct Option: D
Explanation:
The best thing we can do to protect our waterways is try to keep as much plastic as possible out of the waste stream in the first place. There are many small ways you can have a big impact.

1. Wean yourself off disposable plastics.
Ninety percent of the plastic items in our daily lives are used once and then chucked: grocery bags, plastic wrap, disposable cutlery, straws, coffee-cup lids. Take note of how often you rely on these products and replace them with reusable versions. It only takes a few times of bringing your own bags to the store, silverware to the office, or travel mug to Starbucks before it becomes habit.
2. Stop buying water.
Each year, close to 20 billion plastic bottles are tossed in the trash. Carry a reusable bottle in your bag, and you’ll never be caught having to resort to a Poland Spring or Evian again. If you’re nervous about the quality of your local tap water, look for a model with a built-in filter.
3. Boycott microbeads.
Those little plastic scrubbers found in so many beauty products—facial scrubs, toothpaste, body washes—might look harmless, but their tiny size allows them to slip through water-treatment plants. Unfortunately, they also look just like food to some marine animals. Opt for products with natural exfoliants, like oatmeal or salt, instead.
4. Cook more.
Not only is it healthier, but making your own meals doesn’t involve takeout containers or doggy bags. For those times when you do order in or eat out, tell the establishment you don’t need any plastic cutlery or, for some serious extra credit, bring your own food-storage containers to restaurants for leftovers.
5. Purchase items secondhand.
New toys and electronic gadgets, especially, come with all kinds of plastic packaging—from those frustrating hard-to-crack shells to twisty ties. Search the shelves of thrift stores, neighborhood garage sales, or online postings for items that are just as good when previously used. 
6. Recycle (duh).
It seems obvious, but we’re not doing a great job of it. For example, less than 14 percent of plastic packaging is recycled. Check out the number on the bottom of the container. Most beverage and liquid cleaner bottles will be #1 (PET), which is commonly accepted by most curbside recycling companies. Containers marked #2 (HDPE; typically slightly heavier-duty bottles for milk, juice, and laundry detergent) and #5 (PP; plastic cutlery, yogurt and margarine tubs, ketchup bottles) are also recyclable in some areas. 
7. Support a bag tax or ban.
Urge your elected officials to follow the lead of those in San Francisco, Chicago, and close to 150 other cities and counties by introducing or supporting legislation that would make plastic-bag use less desirable.
8. Buy in bulk.
Single-serving yogurts, travel-size toiletries, tiny packages of nuts—consider the product-to-packaging ratio of items you tend to buy often and select the bigger container instead of buying several smaller ones over time.
9. Bring your own garment bag to the dry cleaner.
Invest in a zippered fabric bag and request that your cleaned items be returned in it instead of sheathed in plastic. (And while you’re at it, make sure you’re frequenting a dry cleaner that skips the perc, a toxic chemical found in some cleaning solvents.)
10. Put pressure on manufacturers.
Though we can make a difference through our own habits, corporations obviously have a much bigger footprint. If you believe a company could be smarter about its packaging, make your voice heard. 

An infra-red spectrum shows a broad peak at $3000$ $cm^{-1}$ and a strong peak at $1710$ $cm^{-1}$. Which substance could have produced this spectrum?

allotropes of carbon occurrence of carbon compounds in nature polymers chemistry

  1. Methyl propanoate

  2. Propan-$2$-ol

  3. Propanoic acid

  4. Propanone

Show answer
Correct Option: C
Explanation:
Carboxylic acid broad peak is due -OH from 2500  to 3500 $cm^{-1}$ and strong peak due to Carbonyl bond is from 1700 to 1725 $cm^{-1}$
 So the answer is propanoic acid.

Multiple Answer question 
Instead of using plastics, these/this can be used to avoid pollution :

allotropes of carbon occurrence of carbon compounds in nature polymers chemistry

  1. Jute bags

  2. Paper bags

  3. Cloth bags

  4. Poly bags

Show answer
Correct Option: A,B,C
Explanation:

Jute bags, Paper bags, and cloth bags are all biodegradable substances and decay overtime but poly bags degrade in hundreds of years and causes pollution. Thus, they can be used in place of plastic bags.

Use of biodegradable plastic is not appreciable instead of non-biodegradable plastic.

allotropes of carbon occurrence of carbon compounds in nature polymers chemistry

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Biodegradable plastics are appreciable instead of non-biodegradable plastics.

Which of the followings may reduce plastic pollution?

allotropes of carbon occurrence of carbon compounds in nature polymers chemistry

  1. Stop using bottled water

  2. Bring your own reusable grocery bags with you when you go to the store

  3. Use a refillable dispenser for your hand soap and dish washing liquid, one large bottle is better than using a bunch of small ones

  4. Both A and B

Show answer
Correct Option: A,B,C
Explanation:

We can help to reduce plastic pollution by minimizing the use of plastic and we can do it by stop using bottled water, by bring our own reusable grocery bags when go to the store and by using  a refillable dispenser for your hand soap and dish washing liquid, one large bottle is better than using a bunch of small ones. 

Food and personal product manufacturers, retailers and consumers need to be aware of the benefits of plastics packaging and the need to dispose plastics in a manner which leads to increasing emphasis on recycling. Everyone must understand that the environmental legacy we leave behind for future generations will depend on our resolve to : $REDUCE - REUSE - RECYCLE$.


Which are the keys initiatives by which we can reduce plastic pollution?

allotropes of carbon occurrence of carbon compounds in nature polymers chemistry

  1. Reusing our plastic bags or utensils

  2. Recycling what we have already used

  3. Reducing the unnecessary use of plastic

  4. All of these

Show answer
Correct Option: D
Explanation:

To reduce plastic pollution $3R's$ are used.

$1.$ Reduce.
$2.$ Reuse
$3.$ Recycle
To reduce means to avoid uses of plastic in our daily life.
To reuse means to uses plastic materials, again and again, to avoid their wastage and to recycle means to recycle the already existing plastic in order to avoid the formation of any new plastic.

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