Tag: chemistry

Questions Related to chemistry

The atomic weight of zinc is $65.4$. The volume of dry hydrogen at NTP liberated by treating $6.54\ g$ of zinc with dilute sulphuric acid would be:

chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

  1. $22.4$ litres

  2. $11.2$ litres

  3. $2.24$ litres

  4. $1.12$ litres

Show answer
Correct Option: C
Explanation:

$Zn+H _2SO _4 \rightarrow ZnSO _4+H _2$

The volume of 1 mol of gas at N.T.P. is 22.4 litres. Moles of zinc used is equal to moles of hydrogen liberated.
Moles of zinc used is $\dfrac{6.54}{65.4}$=0.1 mol
Thus volume of hydrogen formed is $ 0.1 \times 22.4$=$2.24$ litres

A gas which is colourless, soluble in water and gives white fumes with $HCl$ is :

chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

  1. nitrogen

  2. chlorine

  3. ammonia

  4. argon

Show answer
Correct Option: C
Explanation:

Ammonia is a colourless gas and is highly soluble in water. 

It is alkaline in nature turning red litmus blue.
The reaction of ${ NH } _{ 3 }$with $HCl$ ;
${ NH } _{ 3 }\quad +\quad HCl\quad \rightarrow \quad N{ H } _{ 4 }Cl\quad $
We get the white fumes of ammonium chloride.

Ammonia is dried over:

chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

  1. slaked lime

  2. conc. $H _2SO _4$

  3. quick lime

  4. $BaCl _2$

Show answer
Correct Option: C
Explanation:
-Ammonia is basic.Hence it can be dried by a basic agent .
So, $CaO$ can be used to dry $NH _3$.
-Slaked lime cannot be used to dry $NH _3$, But dry $Ca$$\left( OH \right) _{ 2 }$ can be used to dry $NH _3$.
-Concentrated $H _2SO _4$ react with $NH _3$ and cannot be used to dry it.
-$BaCl _2$ absorbs $NH _3$ and form $BaCl _2$$.$ $4NH _3$, hence it cannot be used to dry $NH _3$

Which of the following is the weakest base?

chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

  1. Ethyl amine

  2. Ammonia

  3. Dimethyl amine

  4. Methyl amine

Show answer
Correct Option: B
Explanation:

Alkyl group (an electron releasing $\left(+I\right)$ group) increases electron density at N-atom, hence, basic nature is increased.
In ammonia, no alkyl group is present, so it is least basic.

Statement 1: When HCl gas and $NH _3$ gas come into contact, a white smoke forms.
Statement 2: $NH _3$ and HCl react to form a white solid, ammonium chlorate.

chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

  1. Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

  2. Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.

  3. Statement 1 is correct but Statement 2 is not correct.

  4. Statement 1 is not correct but Statement 2 is correct.

  5. Both the Statement 1 and Statement 2 are not correct.

Show answer
Correct Option: C
Explanation:

When ammonia and $HCl$ come in contact, they form ammonium chloride.
$\displaystyle  NH _3+HCl \rightarrow NH _4Cl$

Which of the following substance cannot be decomposed chemically?

chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

  1. Ammonia

  2. Tellurium

  3. Methane

  4. Water

  5. Lunch

Show answer
Correct Option: B
Explanation:

Tellurium $Te$ is an element which can not be further decomposed. Elements are chemically the simplest substances and hence, cannot be broken down using chemical methods. But Ammonia, methane and water are compounds that can be decomposed further into their elements. Lunch is mixture of compounds that can also be decomposed chemically.  

Ammonia gas on passing through copper sulphate solution gives deep blue solution.

chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

  1. True

  2. False

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Correct Option: A
Explanation:

A blue precipitate of cupric hydroxide initially appears which on the addition of excess ammonia dissolves to form a deep blue solution having the tetraamminecopper(II) ion ${ \left[ Cu{ (N{ H } _{ 3 }) } _{ 4 } \right]  }^{ 2+ }$.

Ammonia reacts with excess of chlorine to form :

chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

  1. ${ N } _{ 2 }+N{ H } _{ 4 }Cl$

  2. $N{ Cl } _{ 3 }$ and $HCl$

  3. $N{ H } _{ 4 }Cl$ and $N{ Cl } _{ 3 }$

  4. ${ N } _{ 2 }$ and $HCl$

Show answer
Correct Option: B
Explanation:

Pure chlorine gas may react vigorously with ammonia gas. An excessive mix of the two gases in air can produce hazardous compounds such as nitrogen trichloride.

The following reaction takes place:

$N{ H } _{ 3 }+3{ Cl } _{ 2 }\longrightarrow N{ Cl } _{ 3 }+3HCl$

Ammonia reacts with excess of chlorine to form $ N{ Cl } _{ 3 } $ and $ HCl $.

Which of the following compounds are formed by the reaction of ammonia with acids?

chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

  1. Calcium ammonium nitrate

  2. Ammonium chloride

  3. Ammonium phosphate

  4. Ammonium sulphate

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

$ { NH } _{ 3 }+{ HNO } _{ 3 }\longrightarrow { NH } _{ 4 }NO\ { NH } _{ 3 }+HCl\longrightarrow { NH } _{ 4 }Cl\ { NH } _{ 3 }+{ H } _{ 4 }{ PO } _{ 4 }\longrightarrow ({ { NH } _{ 4 }) } _{ 3 }{ PO } _{ 4 }\ { NH } _{ 3 }+{ H } _{ 2 }{ SO } _{ 4 }\longrightarrow { { (NH } _{ 4 }) } _{ 2 }{ PO } _{ 4 }\  $

All of the above in respective order. 

Ammonia gas cannot be dried by passing through :

chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

  1. $conc.{ H } _{ 2 }S{ O } _{ 4 }$

  2. anhydrous $CaO$

  3. ${ P } _{ 2 }{ O } _{ 5 }$

  4. $CuS{ O } _{ 4 }$

Show answer
Correct Option: A,C
Explanation:

Because ammonia and water will form some amount of ammonium hydroxide, $N{ H } _{ 4 }OH$. The hydroxide will react with the acid ${ H }^{ + }$ ions from the acid and forms water. Addition of an acid to even a mild base like $N{ H } _{ 4 }OH$ is counter-productive to drying.