Tag: ammonia

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

Statement 1: $NH _{3}$ can be best collected by water displacement.

Statement 2: $NH _{3}$ is a polar substance.

  1. <p>Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1</p>

  2. <p>Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1</p>

  3. <p>Statement 1 is correct but Statement 2 is not correct</p>

  4. <p>Statement 1 is not correct but Statement 2 is correct</p>

  5. <p>Both the Statement 1 and Statement 2 are not correct</p>
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Nitrogen, oxygen and hydrogen can be collected by water displacement because they are only slightly soluble in water. But hydrogen chloride or ammonia can not be separated since both are very highly soluble in water and will react to form hydrochloric acid or ammonium hydroxide respectively so statement 1 is not true.

$NH _3$ is a polar substance so statement 2 is correct.

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

When excess of ammonia is used:


 $3Cl _2+8NH _3$$\longrightarrow$$A+B$

When excess of chlorine is used:

$3Cl _2+4NH _3$$\longrightarrow$$C+D$

The oxidation state of nitrogen in compound $A$ is:

  1. $-3$
  2. $+3$
  3. $+5$
  4. $0$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$8 NH _3 + 3 Cl _2 \rightarrow  6 NH _4Cl+N _2$

 Compound A is $NH _4Cl$ 

$1(x)+4(1)+1(-1)=0$

$x+4-1=0$

$x=-3$

The oxidation state of compound A is $-3$

Hence option A is correct.

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

When excess of ammonia is used:
 $3Cl _2+8NH _3$$\longrightarrow$$A+B$
When access of chlorine is used:
$3Cl _2+4NH _3$$\longrightarrow$$C+D$
Oxidation state of nitrogen in compound $B$ is:

  1. $0$
  2. $+1$
  3. $+3$
  4. $-3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$8 NH _3 + 3 Cl _2 \rightarrow  6 NH _4Cl+N _2$

$3Cl _2+4NH _3 \rightarrow  3NH _4Cl+NCl _3$

 Compound  B is $N _2$ Here as the nitrogen is in elemental state so its oxidation state is $0$

 Hence option A is correct.

Multiple choice chemistry nitrogen and sulfur ammonia and fertilizers preparation of ammonia-laboratory method and haber's process ammonia

Which of the following compounds will not give ammonia on heating?

  1. $(NH _{4}) _{2}SO _{4}$
  2. $(NH _{4}) _{2}CO _{3}$
  3. $NH _{4}NO _{2}$
  4. $NH _{4}Cl$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$NH _4NO _2$  will not give ammonia on heating.It gives $NO _2H _2O$

$NH _4NO _2(s)\rightarrow N _2(g) + 2H _2O(g)$

.

Hence option C is correct.

Multiple choice chemistry nitrogen and sulfur ammonia and fertilizers preparation of ammonia-laboratory method and haber's process ammonia

Which of the following factors would favour the formation of ammonia?

  1. High pressure

  2. Low temperature

  3. High volume

  4. Low pressure
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
According to Le Chatelier's principle, high pressure would favour the formation of $NH _{3}$
$N _{2}$(g) + 3$H _2${g) $\leftrightharpoons$ $NH _{3}$(g)
The optimum conditions for the production of $NH _{3}$ are pressure of 200 x 10$^{5}$ Pa (about 200 atm) and temperature of -700 K.
In the given reaction, the number of moles of reactant is more than the product and according to the ideal gas equation, the pressure is inversely proportional to the number of moles.
Thus, by increasing pressure i.e. at high pressure, the reaction will proceed in a forward direction towards less number of moles. Thus the formation of the ammonia increases.
Multiple choice chemistry nitrogen and sulfur ammonia and fertilizers preparation of ammonia-laboratory method and haber's process ammonia

In the preparation of $HNO _{3}$, we get NO gas by catalytic oxidation of ammonia. The moles of NO produced by the oxidation of two moles of $NH _{3}$ will be :

  1. 2

  2. 3

  3. 4

  4. 6
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
In the preparation of $HNO _{3}$, we get NO gas by catalytic oxidation of ammonia.In the below equation 4 moles of $NH _3$ produced 4 moles of $NO$.So the moles of $NO$ produced by the oxidation of two moles of $NH _{3}$ will be2 moles.
$4NH _3+5O _2\rightarrow 4NO+6H _2O$.
Hence option A is correct.
Multiple choice chemistry nitrogen and sulfur ammonia and fertilizers preparation of ammonia-laboratory method and haber's process ammonia

Ammonia is dried over :

  1. Quick lime

  2. Slaked lime

  3. Phosphorus pentoxide
  4. Con. $\mathrm{H} _{2}\mathrm{S}\mathrm{O} _{4}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ammonia is dried by passing it over quick lime because it is a basic gas. Ammonia cannot be dried by conc. sulphuric acid or phosphorus pentaoxide as they will form ammonium sulphate or ammonium phosphate with it.

Multiple choice chemistry nitrogen and sulfur ammonia and fertilizers preparation of ammonia-laboratory method and haber's process ammonia

An element X combines with hydrogen to form a compound $NH _3$. The element X is placed on the right side of the periodic table. What is true about the element X?
(a) Has $3$ valence electrons
(b) Is a metal and is solid
(c) Is a non-metal and is a gas
(d) Has $5$ valence electrons
(e) $NH _3$ reacts with water to form a basic compound.

  1. (a), (b) and (c)

  2. (b), (c) and (d)

  3. (c), (d) and (e)

  4. (e), (a) and (b)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

X is N because it is placed on the right side of the periodic table & compound is $NH _3$. X is a non metal and valence electrons are $5$ & $NH _3+H _2O\rightarrow NH _4OH$(Base)