The p-Block Elements Test

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The p-Block Elements Test - 25

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Weekly Quiz Competition

Question 1
1 / -0

Fluorine, chlorine, bromine, and iodine form a family of related elements, known as:

A
light gases

B
halogens

C
purines

D
the aromatic ring

Solution

Fluorine, chlorine, bromine, and iodine form a family of the related elements called “halogens” because they give salts when they react with metals.
Question 2
1 / -0

$$P_4$$ is a stable from of phosphorus. The percentage of p-character in the orbital forming (P - P) bonds in $$P_4$$ is

A
25

B
33

C
50

D
75

Solution

The percentage of p-character in forming P-P bonds in P4 molecule is: 0. In forming P4molecule, P atom uses sp3 hybrid orbitals. Thus, p-character in hybrid orbitals is 75%. S character is 25%
Question 3
1 / -0

From the options given, which of the following is a noble gas?

A
Gunpowder

B
Iodine

C
Boron

D
Helium

Solution

There are six noble gases- Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), and Radon (Rn).
Thus, among the given options, Helium (option D) is a noble gas.
Question 4
1 / -0

In NaOX , X cannot be:

A
$${ F }_{ 2 }$$

B
$${ Cl }_{ 2 }$$

C
$${ Br }_{ 2 }$$

D
$$I_{ 2 }$$

Solution

The Sodium hypoiodite, $$NaOI$$ has never been isolated, but is formed in dilute aqueous solution by the interaction of sodium hydroxide and iodine, and to a small extent by the electrolysis of an alkaline solution of sodium iodide. The $$\text{substance is extremely unstable, reduction to iodide and oxidation to iodate taking place simultaneously.}$$

Thus, Option D is the answer.
Question 5
1 / -0

Which of the following is the Metallic element in group-15?

A
As

B
Sb

C
Bi

D
P

Solution

Down the group metallic properties increases
$$Bi$$ is the metallic element in group-15
Question 6
1 / -0

Similarity of fluorine and oxygen may not be attributed to?

A
Their atomic and ionic radii are closely similar.

B
The atom of both elements attain an octet of electrons in their valence shell

C
Both of them are highly electronegative elements.

D
Both form stable $$p \pi-p \pi$$ multiple bonds with themselves.

Solution

'Atomic radius of fluorine is 42 pm whereas atomic radius of oygen is 48 pm .Thus there atomic radius are not similar.'
Question 7
1 / -0

Most reactive nobel gas is :

A
$$Ar$$

B
$$Xe$$

C
$$He$$

D
$$Ne$$

Solution

As size increases, I.E. decreases reactivity of noble gas increases so $$Xe$$ is most reactive.
Question 8
1 / -0

Lowest oxidation state of phosphorous is in:

A
$${ H_{ 3 } }{ PO }_{ 2 }$$

B
$${ H_{ 3 } }{ PO }_{ 4 }$$

C
$${ H_{ 4 } }{ P_{ 2 }O }_{ 7 }$$

D
$${ H_{ 3 } }{ PO }_{ 3 }$$

Solution

oxidation state of oxygen ;- $$-2$$
oxidation state of hydrogen ;-$$1$$
$$H_3PO_2$$ :-
$$ 1*3 + x +(-2)*2=0$$
$$x=1$$
$$H_3PO_4$$:-
$$ 1*3 + x +(-2)*4=0$$
$$x=5$$
$$H_4P_2O_7$$:-
$$ 1*4 + 2x +(-2)*7=0$$
$$x=5$$
$$H_3PO_3$$:-
$$ 1*3 + x +(-2)*3=0$$
$$x=3$$
As we can see from the result:-
$$H_3PO_3$$ has the lowest oxidation state.
Question 9
1 / -0

Which of the following is paramagnetic in nature?

A
NO

B
$$N_2O$$

C
$$N_2O_5$$

D
All of the above

Solution
Question 10
1 / -0

Which of the following statements is not correct?

A
All halogens except flourine from OXO-acids

B
Hypohalous acids HOCI,HOBr and HOI are all strong acids

C
Hypochlorous acid is the most stable among hypohalous acids

D
Chlorous acid is the only halous acid known

Solution

There are also other halous acids like:
$$HOBr_2$$ which is Hydrobromous acid.
So D is wrong

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Re-Attempt Weekly Quiz Competition

The p-Block Elements Test - 25

Result

The p-Block Elements Test - 25

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SHARING IS CARING

Question 1

light gases

halogens

purines

the aromatic ring

Solution

Question 2

25

33

50

75

Solution

Question 3

Gunpowder

Iodine

Boron

Helium

Solution

Question 4

$${ F }_{ 2 }$$

$${ Cl }_{ 2 }$$

$${ Br }_{ 2 }$$

$$I_{ 2 }$$

Solution

Question 5

As

Sb

Bi

P

Solution

Question 6

Their atomic and ionic radii are closely similar.

The atom of both elements attain an octet of electrons in their valence shell

Both of them are highly electronegative elements.

Both form stable $$p \pi-p \pi$$ multiple bonds with themselves.

Solution

Question 7

$$Ar$$

$$Xe$$

$$He$$

$$Ne$$

Solution

Question 8

$${ H_{ 3 } }{ PO }_{ 2 }$$

$${ H_{ 3 } }{ PO }_{ 4 }$$

$${ H_{ 4 } }{ P_{ 2 }O }_{ 7 }$$

$${ H_{ 3 } }{ PO }_{ 3 }$$

Solution

Question 9

NO

$$N_2O$$

$$N_2O_5$$

All of the above

Solution

Question 10

All halogens except flourine from OXO-acids

Hypohalous acids HOCI,HOBr and HOI are all strong acids

Hypochlorous acid is the most stable among hypohalous acids

Chlorous acid is the only halous acid known

Solution

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