The p-Block Elements Test

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The p-Block Elements Test - 37

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Weekly Quiz Competition

Question 1
1 / -0

An element X forms an oxide $$XO_3$$. What is the valency of X?

A
1

B
2

C
3

D
6

Solution

Valency of Oxygen is 2
Question 2
1 / -0

Sea weeds are an important source of :

A
Iron

B
Chlorine

C
Iodine

D
Bromine

Solution

Iodine is a component of almost every living plant and animal. No standard measurements of iodine in food exist because iodine concentrations vary across the world. In general, foods from the sea contain the most iodine, followed by animal foods, then plant foods. Of all foods, seaweed (like kelp), is the most well known and reliable source of natural iodine. Egg and dairy products can also be good sources.
Question 3
1 / -0

For the elements: $$Cl, Br, F, Al, C, Li, Cs$$ & $$Xe$$.
Choose the best option. The element having 8 electrons in the outermost shell is:

A
$$Xe$$

B
$$Cs$$

C
$$Br$$

D
$$C$$

Solution

Xe is a noble element. All noble elements except He have 8 electrons in the outermost shell.

Hence option A is the correct answer
Question 4
1 / -0

The proof of oxidizing action of hydrogen peroxide in acid solution is in the formation of

A
$$O_2$$

B
$$H_2O$$

C
both $$H_2O$$ and $$O_2$$

D
both $$H_3O^+$$ and $$O_2$$

Solution

$$2H_2O_2\rightarrow 2H_2O+O_2$$
Question 5
1 / -0

Which one of the following noble gases is least polarizable?

A
$$Xe$$

B
$$Ar$$

C
$$Ne$$

D
$$He$$

E
All have equal polarizablilty

Solution

$$He$$ is least polarizable. Among noble gases, $$He$$ has smallest size. lower is the size, more strongly are the valence electrons held with nucleus and lower is the polarizability.
Question 6
1 / -0

The bond in compound formed from combination of 14 group and 17 group elements of Periodic table will be ..............

A
Electrovalent bond

B
Co-ordinate bond

C
Van der Walls bond

D
Covalent bond

Solution

Groups $$14$$ is carbon family. Common characteristics of groups 14 elements are they form covalent bonds. Because carbon's electronic configuration is $$1s^2\,2s^2\,2p^2$$. If forms 4 covalent bonds in compounds. Groups $$17$$ is Halogen family. The bond formed by $$17$$ element $$(Cl,I,Br\,etc)$$ is covalent bond.
Question 7
1 / -0

Directions For Questions

The chemistry of halogens is interesting. Halogens belong to the group 17 of the periodic table. The name Halogen was introduced by J.S.C. Schweiggen in 1811 to describe the property of chlorine (at that time unique among the elements) to combine directly with metals to give salts. Iodine is an essential trace element for humans and plays an important role in growth regulating hormone thyroxine, which is produced in the thyroid gland. Deficiency of iodine in diet leads to Goitre. In order to prevent this condition, about 0.01% $$NaI$$ is added to the table salt. Iodine is a lustrous solid and sublimes at ordinary temperature.

...view full instructions

The sublimation of iodine is due to

A
Low melting point

B
Weak $$I - I$$ Bond

C
Weak van der Waals forces among $$I_2$$ molecules

D
Lone pair - lone pair repulsion in $$I_2$$ molecule

Solution

Iodine is a solid which is easily sublimable. This is due to the weak vanderwaals forces of attraction among $$I_2$$ molecules.
Question 8
1 / -0

When a mixture of carbon monoxide and chlorine is exposed to sunlight the product formed is:

A
carbon tetrachloride

B
phosgene

C
phosphine

D
carbon chloride

Solution

Industrially phosgene is produced by passing CO and chlorine gas through a bed of porous activated carbon as catalyst. Naturally phosgene is produced in the presence of ultraviolet rays and oxygen chloroform converts to phosgene by radical reaction.
Question 9
1 / -0

At high temperature, nitrogen combines with $$CaC_2$$ to give___________.

A
calcium cyanide

B
calcium cyanamide

C
calcium carbonate

D
calcium nitride

Solution

Calcium carbide is used in the production of calcium cyanamide by means of reacting it with nitrogen in a high temperature.
$${ CaC }_{ 2 }+{ N }_{ 2 }\rightarrow { CaCN }_{ 2 }+C$$
Question 10
1 / -0

A piece of magnesium ribbon was heated to redness in an atmosphere of nitrogen and on cooling water was added the gas evolved was:

A
ammonia

B
hydrogen

C
nitrogen

D
oxygen

Solution

Magnesium metal reacts with nitrogen in air to form magnesium nitride which on hydrolysis gives ammonia gas.
$$3Mg+N_2\xrightarrow{Burning} Mg_3N_2$$
$$Mg_3N_2+6H_2O\rightarrow 3Mg(OH)_2+2NH_3$$

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Re-Attempt Weekly Quiz Competition

The p-Block Elements Test - 37

Result

The p-Block Elements Test - 37

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SHARING IS CARING

Question 1

1

2

3

6

Solution

Question 2

Iron

Chlorine

Iodine

Bromine

Solution

Question 3

$$Xe$$

$$Cs$$

$$Br$$

$$C$$

Solution

Question 4

$$O_2$$

$$H_2O$$

both $$H_2O$$ and $$O_2$$

both $$H_3O^+$$ and $$O_2$$

Solution

Question 5

$$Xe$$

$$Ar$$

$$Ne$$

$$He$$

All have equal polarizablilty

Solution

Question 6

Electrovalent bond

Co-ordinate bond

Van der Walls bond

Covalent bond

Solution

Question 7

Low melting point

Weak $$I - I$$ Bond

Weak van der Waals forces among $$I_2$$ molecules

Lone pair - lone pair repulsion in $$I_2$$ molecule

Solution

Question 8

carbon tetrachloride

phosgene

phosphine

carbon chloride

Solution

Question 9

calcium cyanide

calcium cyanamide

calcium carbonate

calcium nitride

Solution

Question 10

ammonia

hydrogen

nitrogen

oxygen

Solution

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