The p-Block Elements Test

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The p-Block Elements Test - 45

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Question 1
1 / -0

Among the following halogens, the one which does not form an oxyacid is:

A
Fluorine

B
Chlorine

C
Bromine

D
Iodine

Solution

Among the halogens, fluorine does not form an oxyacid due to high electronegatvity and small size. Fluorine forms only one oxyacid, i.e. HOF, hypofluorous acid or fluoric acid.
Question 2
1 / -0

Which of the following does not contain nitrogen?

A
Proteins in plants and animals

B
Members of apatite family

C
Indian saltpetre

D
Chile saltpetre

Solution

Apatite is a group of phosphate minerals, usually referring to hydroxylapatite, fluorapatite and chlorapatite, with high concentrations of $$OH^{-},F{-},Cl{-}$$ respectively, in the crystal. Proteins in plants and animals have nitrogen. Chile saltpetre and Indian saltpetre are $$NaNO_3$$ and $$KNO_3$$ respectively.
Question 3
1 / -0

Which compounds is related to Haber's process:

A
$$CO_2$$

B
$$H_2$$

C
$$NO_2$$

D
$$NH_3$$

Solution

Haber's process is used to synthesize ammonia ($$NH_3$$) from nitrogen and hydrogen gases using in 1:3 ratio and $$Fe,Mo$$ is used as catalyst and promoter respectively.
$$N_2+3H_2\xrightarrow[Fe]{Mo}2NH_3$$
Hence option D is correct
Question 4
1 / -0

Which of the following $$P$$ most stable?

A
Red

B
White

C
Black

D
All of these

Solution

Black phosphorus is the most stable allotrope of phosphorus. It has a layered structure. It is a very highly polymerised form of the element.
We can find black phosphorus in two main forms. They are alpha black phosphorus and beta black phosphorus.
While beta black phosphorus forms when white phosphorus is heated at 473K, alpha black phosphorus forms when we heat red phosphorus at 803K.
Beta black phosphorus conducts electricity while alpha black phosphorus doesn’t conduct electricity.

Hence, the correct option is $$C$$
Question 5
1 / -0

Chlorine water oxidises thiosulphates to:

A
sulphate

B
persulphate

C
sulphide

D
none of these

Solution

Chlorine is a oxidizing agent, when chlorine water react with Sodium thiosulphate, it oxidises sodium thiosulphate to sulphur which is formed as precipitate.
$$Na_2S_2O_3$$ $$+$$ $$Cl_2$$ $$+$$ $$H_2O$$ $$\longrightarrow $$ $$2HCl$$ $$+$$ $$Na_2SO_4$$ $$+$$ $$S$$
Green Colur of chlorine water get change to Colourless Oxidate.
Question 6
1 / -0

In an organic compound $$P$$ is estimated as:

A
$$Mg_{2}P_2O_7$$

B
$$Mg_3(PO_4)_2$$

C
$$H_3PO_4$$

D
$$P_2O_5$$

Solution

In the qualitative analysis Phosphorous is estimated by the formation of $$Mg_{2}{ P }_{ 2 }{ O }_{ 7 }$$.
Question 7
1 / -0

The three important oxidation state of $$P$$ are:

A
$$-3,+3,+5$$

B
$$-3,+3,-5$$

C
$$-3,+4,-4$$

D
$$-3,+3,+4$$

Solution

Three important oxidation states of phosporous are :
+3 is due to the participation of only $$3P^{3}$$(due to inert pair effect). Only three electrons involve in bond formation.
+5 is due to the participation of $$3s^{2}3P^{3}$$(due to absence of inert pair effect). All the five electrons involves in bond formation.
-3 is due to gain of three electrons as it has five electrons in valence shell so as to attain octet configaration.
Hence option D is correct.
Question 8
1 / -0

Formula of Freon is:

A
$$CCl_2F_2$$

B
$$COCl_2$$

C
$$SO_2Cl_2$$

D
none of these

Solution

$$CCl_2F_2$$ is called as freons or chloro floro carbons.
Hence option A is correct.
Question 9
1 / -0

Which of the following does exist?

A
$$HFO_2$$

B
$$HClO_2$$

C
$$HBrO_2$$

D
$$HIO_2$$

Solution

$$HClO_2$$ is a chlorous acid which is oxyacid of halogen.
Remaining oxyacids of halogens do not exist.
Bromous acid $$HBrO_2$$ and Iodous acid $$HIO_2$$ and fluorous acid are not likely to exist in nature as they would decompose into oxides and water vapour when trying to isolate them from their respective acid solutions.
Hence, option $$B$$ is correct.
Question 10
1 / -0

Which of the following gives purest form of nitrogen?

A
Thermal decomposition of ammonium nitrate

B
Treating aqueous solution of ammonium chloride with sodium nitrite

C
Thermal decomposition of sodium or barium azide

D
Liquefaction and fractional distillation of air

Solution

$$2NaN_3 \rightarrow 2Na +3N_2$$
Pure nitrogen can be obtained from thermal decomposition of sodium or barium azide.

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Re-Attempt Weekly Quiz Competition

The p-Block Elements Test - 45

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The p-Block Elements Test - 45

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SHARING IS CARING

Question 1

Fluorine

Chlorine

Bromine

Iodine

Solution

Question 2

Proteins in plants and animals

Members of apatite family

Indian saltpetre

Chile saltpetre

Solution

Question 3

$$CO_2$$

$$H_2$$

$$NO_2$$

$$NH_3$$

Solution

Question 4

Red

White

Black

All of these

Solution

Question 5

sulphate

persulphate

sulphide

none of these

Solution

Question 6

$$Mg_{2}P_2O_7$$

$$Mg_3(PO_4)_2$$

$$H_3PO_4$$

$$P_2O_5$$

Solution

Question 7

$$-3,+3,+5$$

$$-3,+3,-5$$

$$-3,+4,-4$$

$$-3,+3,+4$$

Solution

Question 8

$$CCl_2F_2$$

$$COCl_2$$

$$SO_2Cl_2$$

none of these

Solution

Question 9

$$HFO_2$$

$$HClO_2$$

$$HBrO_2$$

$$HIO_2$$

Solution

Question 10

Thermal decomposition of ammonium nitrate

Treating aqueous solution of ammonium chloride with sodium nitrite

Thermal decomposition of sodium or barium azide

Liquefaction and fractional distillation of air

Solution

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