The p-Block Elements Test

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The p-Block Elements Test - 30

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Weekly Quiz Competition

Question 1
1 / -0

The ions $$Mg^{+2}$$ and $$PO_{4}^{-3}$$ combine to form compounds:

A
$$Mg_3(PO_4)_2$$

B
$$Mg_2(PO_4)_2$$

C
$$Mg_2(PO_4)_3$$

D
$$Mg_3(PO_4)_3$$

Solution

The ions $$Mg^{+2}$$ and $$PO_{4}^{-3}$$ combine to form compounds $$Mg_3(PO_4)_2$$. Total charge on cation $$=3(2+)=+6$$. Total charge on anion $$=2(-3)=-6$$. Hence, total charge on cation $$=$$ total charge on anion.
Question 2
1 / -0

Nitrogen can exhibit which of the following oxidation states:

A
$$+1$$

B
$$+2$$

C
$$+3$$

D
all of the above

Solution

Nitrogen forms oxides in which nitrogen exhibits each of its positive oxidation numbers from +1 to +5. $$N_2O$$ has nitrogen in the +1 oxidation state, $$NO$$ has +2 and $$NO_2$$ has +4 oxidation state.
Question 3
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Magnesium on heating to redness in an atmosphere of $$N_{2}$$ and then on treating with $$H_{2}O$$ gives?

A
$$NH_{3}$$

B
$$H_{2}$$

C
$$N_{2}$$

D
$$O_{2}$$

Solution

Megnesium when heated with $$N_2$$ in atmosphere it forms magnesium nitride($$Mg_3N_2$$) which on hydrolysis(reaction with water) gives ammonia.
$$3Mg+N_2\rightarrow Mg_3N_2$$
$$Mg_3N_2+6H_2O\rightarrow 3Mg(OH)_2+2NH_3$$.
Hence option A is correct.
Question 4
1 / -0

Nitrogen is liberated by the thermal decomposition of only :

A
$$NH_4NO_2$$

B
$$NaN_3$$

C
$$(NH_4)_2Cr_2O_7$$

D
All of these

Solution

Nitrogen is liberated by the thermal decomposition of ammonium nitrite $$(NH_4NO_2), NaN_3, (NH_4)_2Cr_2O_7$$
Question 5
1 / -0

Phosphide and phosphate ions are:

A
$$PO_{4}^{3-}$$ and $$P^{3-}$$

B
$$P^{3-}$$ and $$PO_{4}^{3-}$$

C
$$PO_{3}^{4-}$$ and $$P^{4-}$$

D
$$P^{4-}$$ and $$PO_{3}^{4-}$$

Solution

Phosphide and phosphate ions are $$P^{3-}$$ and $$PO_{4}^{3-}$$ respectively. Thus, sodium phosphide can be represented as $$Na_3P$$ and sodium phosphate can be represented as $$Na_3PO_4$$.
Question 6
1 / -0

The steps for the manufacture of nitric acid by Ostwald process are given. Arrange them in sequence.
(a) Recirculation of nitric oxide
(b) Addition of $$H_2O$$ to nitrogen dioxide
(c) Oxidation of nitric oxide.
(d) Catalytic oxidation of ammonia

A
d c b a

B
d c a b

C
c d b a

D
c d a b

Solution

In the first step of Ostwald process, ammonia is oxidised to form nitric oxide.
$$4NH_3 + 5O_2 \leftrightarrow 4NO + 6H_2O$$

In the second step, nitric oxide is oxidised to form nitrogen dioxide.
$$2NO + O_2 \leftrightarrow 2NO_2$$

Then, nitrogen dioxide is mixed with water in an absorption tower to get nitric acid.
$$3NO_2 + H_2O \rightarrow 2HNO_3 + NO$$

Lastly, nitrogen dioxide is recirculated in the absorption tower to ensure that more and more of it is absorbed with water to increase the concentration of nitric acid. The vapours of nitric acid are then passed over concentrated sulphuric acid that absorbs water from it to increase its concentration further.
Question 7
1 / -0

At low temperatures, nitrogen:

A
is poisonous

B
is highly soluble in water

C
can be liquefied on compression

D
dissociates to form nascent nitrogen

Solution

At low temperatures nitrogen can be liquefied on compression.
Question 8
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Industrial preparations of $$HNO_{3}$$ by Ostwald's process involves:

A
reduction of $$NH_{3}$$

B
oxidation of $$NH_{3}$$

C
hydrogenation of $$NH_{3}$$

D
hydrolysis of $$NH_{3}$$

Solution

$$4NH_3 (g) + 5O_2 (g) \rightarrow 4NO (g) + 6H_2O (g)$$

$$2NO(g) +O_2(g) \xrightarrow {50^oC} 2NO_2(g)$$

$$4NO_2(g) + 2H_2O(l) +O_2(g) \rightarrow 4HNO_3(aq)$$

Oxidation of Ammonia occurs in the preparation of ammonia.
Option B is correct.
Question 9
1 / -0

Nitrogen reacts with a metal $$M$$ to produce a compound $$X$$. This compound $$X$$, when dissolved in water forms pungent gas $$Y$$ which can be identified easily by the formation of white fumes in the presence of $$HCl$$.

Identify the compound $$X$$.

A
Iron nitride

B
Calcium nitride

C
Nitrolim

D
Sodium nitride

Solution

Calcium nitride dissolves in water to give ammonia gas.
Compound $$X$$ is $$Ca_3N_2$$.

$${Ca_3}N_2 + 6H_2O \rightarrow 3Ca (OH)_2+2{NH_3}$$

Hence, (B) is the correct answer.
Question 10
1 / -0

$$PCl_5$$ molecule has:

A
three fold axis of symmetry

B
two fold axis of symmetry

C
both $$A$$ and $$B$$

D
none of these

Solution

Considering the structure as shown in above image and hybridization of $$PCl_5$$, we can say that it has both three fold axis of symmetry and two fold axis of symmetry.

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The p-Block Elements Test - 30

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The p-Block Elements Test - 30

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Question 1

$$Mg_3(PO_4)_2$$

$$Mg_2(PO_4)_2$$

$$Mg_2(PO_4)_3$$

$$Mg_3(PO_4)_3$$

Solution

Question 2

$$+1$$

$$+2$$

$$+3$$

all of the above

Solution

Question 3

$$NH_{3}$$

$$H_{2}$$

$$N_{2}$$

$$O_{2}$$

Solution

Question 4

$$NH_4NO_2$$

$$NaN_3$$

$$(NH_4)_2Cr_2O_7$$

All of these

Solution

Question 5

$$PO_{4}^{3-}$$ and $$P^{3-}$$

$$P^{3-}$$ and $$PO_{4}^{3-}$$

$$PO_{3}^{4-}$$ and $$P^{4-}$$

$$P^{4-}$$ and $$PO_{3}^{4-}$$

Solution

Question 6

d c b a

d c a b

c d b a

c d a b

Solution

Question 7

is poisonous

is highly soluble in water

can be liquefied on compression

dissociates to form nascent nitrogen

Solution

Question 8

reduction of $$NH_{3}$$

oxidation of $$NH_{3}$$

hydrogenation of $$NH_{3}$$

hydrolysis of $$NH_{3}$$

Solution

Question 9

Iron nitride

Calcium nitride

Nitrolim

Sodium nitride

Solution

Question 10

three fold axis of symmetry

two fold axis of symmetry

both $$A$$ and $$B$$

none of these

Solution

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