Tag: chemistry

Questions Related to chemistry

In plants, atmospheric nitrogen is converted into : 

chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

  1. carbohydrate

  2. proteins

  3. amino acids

  4. fats

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Correct Option: B,C
Explanation:

Nitrogen fixation is a process in which nitrogen ($N _2$) in the atmosphere is converted into ammonium ($NH _4^+$). Nitrogen fixation, natural and synthetic, is essential for all forms of life because nitrogen is required to biosynthesize basic building blocks of plants, animals and other life forms, e.g., nucleotides for DNA and RNA and amino acids for proteins. 

If the amount of nitrogen in air is low, then the burning capacity of air decreases.

chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

  1. True

  2. False

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Correct Option: B
Explanation:

Nitrogen is not combustible under ordinary circumstances. In fact, the National Fire Protection Association has given nitrogen a flammability rating of zero so it has no effect on burning.

$Ca+C _{2}\rightarrow CaC _{2} + N _2\rightarrow A$


Compound (A) is used as a/an:

chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

  1. fertillizer

  2. dehydrating agent

  3. oxidising agent

  4. reducing agent

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Correct Option: A
Explanation:

$Ca+C _2\rightarrow CaC _2+N _2\rightarrow  Ca(CN) _2$


So, $CaC _2$ is used as ripening agent and $Ca(CN) _2$ used as fertilizer.


Hence, option A is correct.

$\mathrm{A}$ nitrogenous fertilizers having more nitrogen is :

chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

  1. $(\mathrm{N}\mathrm{H} _{4}) _{2}\mathrm{S}\mathrm{O} _{4}$

  2. $Ca(NO _{3}) _2$

  3. $NH _{2}CONH _{2}$

  4. $NH _4NO _3$

Show answer
Correct Option: C
Explanation:

Percentage of $N _2$ in following compounds is calculated by formula 
$(atomic weight of N _2 in compound / Atomic weight  the compound)\times100$
So, percentage of $N _2$ in compounds is given as
In ${(NH _4)} _{2}SO _4$ it is 21%
In $Ca{(NO _3)} _{2}$ it is 17%
In $NH _2CONH _2$ it is 47%
In $NH _4NO _3$ it is 35%.

Which one of the following statement is not correct for  $N _{2}$?

chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

  1. It has small size

  2. It is a typical non metal

  3. It does not eadily react with oxygen

  4. d-orbitals are available for bonding

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Correct Option: D
Explanation:

d-orbitals are not available for bonding in N. 
there are not any 2d orbitals 
Electronic configuration: $1s^{2} 2s^{2} 2p^{3}$

Assertion (A): Anhydrous Calcium chloride is used as catalyst in cyanamide process
Reason (R): Catalyst increases the rate of reaction.

chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

  1. Both (A) and (R) are true and (R) is the correct explanation of (A)

  2. Both (A) and (R) are true and (R) is not the correct explanation of (A)

  3. (A) is true and (R) is false

  4. (A) is false but (R) is true

Show answer
Correct Option: A
Explanation:

Catalyst increases the rate of reaction both in forward and reverse direction by decreasing the activation energy.
In cyanamide process, calcium chloride is used to increase the rate.

Animals die in nitrogen because __________.

chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

  1. It destroys haemoglobin.

  2. Of the want of oxygen.

  3. It is heavier than air.

  4. It is poisonous.

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Correct Option: B
Explanation:

Animals need oxygen for breathing. If they don't get oxygen they die.

Assertion : Nitrogen is inactive in normal chemical reactions.
Reason : The bond dissociation energy is directly proportional to reactivity.

chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

  1. Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion

  2. Both Assertion and Reason are correct but the Reason is not the correct explanation of the Assertion

  3. Assertion is correct but the Reason is incorrect

  4. Assertion is incorrect but the Reason is correct

Show answer
Correct Option: C
Explanation:

The bond dissociation energy is inversely proportional to reactivity.
Nitrogen is inactive in normal chemical reactions due to its high bond dissociation energy.

Which of the following gives blue flame when burn and is not very soluble in water?

chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

  1. $\displaystyle { O } _{ 2 }$

  2. $\displaystyle { CO } _{ 2 }$

  3. $\displaystyle { N } _{ 2 }$

  4. $\displaystyle { H } _{ 2 }{ SO } _{ 4 }$

  5. $\displaystyle He$

Show answer
Correct Option: C
Explanation:

Nitrogen burns with a blue flame and is not very soluble in water.

Which is the volatile covalent liquid at $25^\circ\text C$ and 1 atm ?

chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

  1. N$ _2$

  2. Kl

  3. CCl$ _4$

  4. AgNO$ _3$

  5. CaCO$ _3$

Show answer
Correct Option: C
Explanation:

Usually, compounds comprising of only non-metals tend to have covalent bonds. Therefore, among the given options, only A and C are covalent compounds. However, between the two, $N _2$ exists as a gas. $CCl _4$ is a covalent compound that exists as a liquid at standard temperature and pressure.