The p-Block Elements Test

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The p-Block Elements Test - 39

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Weekly Quiz Competition

Question 1
1 / -0

The wrong statements about $$\displaystyle NH_{3}$$ is :

A
it is oxidised with oxygen at $$\displaystyle 700^{\circ}C$$ in the presence of platinum

B
it gives black precipitate with calomel

C
it can be dried by $$\displaystyle P_{2}O_{5},\ H_{2}SO_{4}\, $$and$$\, CaCl_{2}$$

D
it gives white fumes with HCI

Solution

$$NH_3$$ is oxidised to nitric oxide and water with oxygen at $$700^oC $$ in the presence of platinum.
Aqueous ammonia reacts with calomel $$Hg_2Cl_2$$ to produce metallic mercury, a black precipitate.
$$CaO$$ calcium oxide is used for drying of ammonia. Because $$CaO$$ being basic in nature does not react with $$NH_3$$ while $$P_2O_5, $$ conc. $$H_2SO_4 \ $$and$$ \ CaCl_2$$ reacts with it.
$$CaO + H_2O + NH_3 \rightarrow NH_3 + Ca(OH)_2$$
$$CaCl_2 + 8NH_3 \rightarrow CaCl_2.8NH_3$$
$$P_2O_5 + 3H_2O + 6NH_3 \rightarrow 2(NH_4)_3PO_4$$
$$H_2SO_4 + NH_3 \rightarrow (NH_4)_2SO_4$$
$$NH_3$$ gives White fumes of $$NH_4Cl$$ with $$HCl$$.
Question 2
1 / -0

Which one of the following compounds is heated with slaked lime to produce ammonia?

A
$${NH}_{4}Cl$$

B
$$Na{NO}_{3}$$

C
$$K{NO}_{3}$$

D
$$Ca{({NO}_{3})}_{2}$$

Solution

$$2 NH_4Cl + Ca(OH)_2 \rightarrow CaCl_2+2NH_3+H_2O$$
Question 3
1 / -0

Thermodynamically most stable allotrope of phosphorus is_____

A
red

B
white

C
black

D
yellow

Solution

Black phosphorus is the most stable form; the atoms are linked together in puckered sheets, like graphite. Because of these structural similarities black phosphorus is also flaky like graphite and possesses other similar properties.
Question 4
1 / -0

White Phosphorus is generally kept under :

A
Alcohol

B
Water

C
Glycerine

D
Kerosine oil

E
Ether

Solution

The allotropic form of Phosphorus (white phosphorus) is less stable and therefore highly reactive because of angular strain in $$P_4$$ molecule where the angles are only $$60^0$$ It readily catches fire in air to give dense white fumes of $$P_4O_{10}$$.
$$P_4 + 5O_2 \rightarrow P_4O_{10}$$
Therefore it is kept in water to avoid oxidation by the oxygen present in air. It is kept in water because it is insoluble in water.
So answer is B.
Question 5
1 / -0

'Kajal' is produced from:

A
stibnite

B
charcoal

C
carbon black

D
asphalt

Solution

Kohl/Kajal is a dark powder used as eye makeup. It is made from Stibinite $$(Sb_2S_3)$$ which is the main use of Antimony, $$Sb_2S_3$$ is used in Kohl/Kajal due to its soft material and dark colour.
Question 6
1 / -0

The most poisonous form of phosphorous is:

A
white

B
red

C
black

D
violet

Solution

White Phosphorous are highly poisonous and in vapour form, they can cause a disease called 'Phossy jaw' in which jaw bones are decayed. White Phosphorous is used to make rat poison.
Red Phosphorous are not poisonous.
Question 7
1 / -0

The halogen $$($$Group $$17$$ elements$$)$$:

A
have an electron configuration of a noble gas less seven electrons

B
are highly electro positive

C
show variable oxidation state of $$-1, +1, +3, +5$$ and $$+7$$ in their various compounds

D
forms a volatile, covalent hydrides $$HX$$ in which the halogen $$(X)$$ shows an oxidation state of $$+1$$

Solution

Fluorine is the most electronegative in halogen family so it has oxidation number of -1 in all its compounds but Cl,Br and I are less electronegative so these elements prepare compounds with oxidation number of +1,+3,+5 and +7.
Question 8
1 / -0

Which group of periodic table contains no metal?

A
IA

B
IIIA

C
VIIA

D
VIII

Solution

Group IA and III A contain mostly metals. Group VIII contains transition elements which are metals. Group VII A,contains mostly non-metals $$(F,Cl, Br)$$.
VIIA group is the group of halogens.
It contains no metal.
The word halogen means salt producing so, halogens reacts with metals to form salts.
The halogen family is as follows:
Flourine
Chlorine
Bromine
Iodine
Astatine.
Question 9
1 / -0

The Group VA element that makes up part of bones and teeth is:

A
N

B
P

C
As

D
Sb

Solution

Teeth are composed of calcium, phosphorus, and other minerals. Bones contain calcium, phosphorus, sodium and other minerals, but mostly consist of the protein collagen. Collagen is a living, growing tissue that gives bones their a flexible framework that allows them to withstand pressure. Calcium fills in the space around that framework and makes the bone strong enough to support the body's weight.
Question 10
1 / -0

Noble gases are absorbed by :

A
Anhydrous calcium chloride

B
Ferric hydroxide

C
Conc. $$H_2SO_4$$

D
Activated coconut charcoal

Solution

Activated charcoal is a very good absorbent of gas, whereas anhydrous $$CaCl_2$$, $$Fe(OH)_3$$ and conc. $$H_2SO_4$$ are dehydrating agents.

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The p-Block Elements Test - 39

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The p-Block Elements Test - 39

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Question 1

it is oxidised with oxygen at $$\displaystyle 700^{\circ}C$$ in the presence of platinum

it gives black precipitate with calomel

it can be dried by $$\displaystyle P_{2}O_{5},\ H_{2}SO_{4}\, $$and$$\, CaCl_{2}$$

it gives white fumes with HCI

Solution

Question 2

$${NH}_{4}Cl$$

$$Na{NO}_{3}$$

$$K{NO}_{3}$$

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

Solution

Question 3

red

white

black

yellow

Solution

Question 4

Alcohol

Water

Glycerine

Kerosine oil

Ether

Solution

Question 5

stibnite

charcoal

carbon black

asphalt

Solution

Question 6

white

red

black

violet

Solution

Question 7

have an electron configuration of a noble gas less seven electrons

are highly electro positive

show variable oxidation state of $$-1, +1, +3, +5$$ and $$+7$$ in their various compounds

forms a volatile, covalent hydrides $$HX$$ in which the halogen $$(X)$$ shows an oxidation state of $$+1$$

Solution

Question 8

IA

IIIA

VIIA

VIII

Solution

Question 9

N

P

As

Sb

Solution

Question 10

Anhydrous calcium chloride

Ferric hydroxide

Conc. $$H_2SO_4$$

Activated coconut charcoal

Solution

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