Practice Start Test

p-Block Elements

NEET Chemistry · 114 questions · Page 11 of 12 · Click an option or "Show Solution" to reveal answer

Q101
Which of the following anions is present in the chain structure of silicates?
A (Si 2 O52−_5^{2 - }) n
B (SiO32−_3^{2 - }) n
C SiO44−_4^{4 - }
D Si 2 O76−_7^{6 - }
Correct Answer
Option B
Solution

[SiO 3 2– ] n and [Si 4 O 11 ] 6– have chain structure of silicates.

Q102
Which of the following oxidation states are the most characteristic for lead and tin respectively?
A +2, +4
B +4, +4
C +2, +2
D +4, +2
Correct Answer
Option A
Solution

The tendency to from +2 ionic state increases on moving down the group due to inert pair effect.

Most characteristic oxidation state for lead and tin are +2, +4 respectively.

Q103
Which one of the following orders correctly represents the increasing acid strengths of the given acids?
A HOClO < HOCl < HOClO 3 < HOClO 2
B HOClO 2 < HOClO 3 < HOClO < HOCl
C HOClO 3 < HOClO 2 < HOClO < HOCl
D HOCl < HOClO < HOClO 2 < HOClO 3
Correct Answer
Option D
Solution

As the oxidation number of the central atom increases, strength of acid also increases.

Q104
Which of the following is the most basic oxide?
A SeO 2
B Al 2 O 3
C Sb 2 O 3
D Bi 2 O 3
Correct Answer
Option D
Solution

SeO 2 →\to acidic oxide Al 2 O 3 →\to amphoteric, Sb 2 O 3 →\to amphoteric Bi 2 O 3 →\to basic oxide.

Q105
In which of the following molecules are all the bonds are not equal?
A NF 3
B ClF 3
C BF 3
D AlF 3
Correct Answer
Option B
Solution

The Cl - F (Cl - F b ) bond length is equal to 1.60

Ao\mathop A\limits^o

while each of two axial Cl - F (Cl - F a ) bond length is equal to 1.70

Ao\mathop A\limits^o

.

Q106
The correct order regarding the electronegativity of hybrid orbitals of carbon is
A sp < sp 2 < sp 3
B sp > sp 2 < sp 3
C sp > sp 2 > sp 3
D sp < sp 2 > sp 3
Correct Answer
Option C
Solution

Among the three given hybrid orbitals, sp hybrid orbital is most electronegative.

Contribution of s in sp hybrid orbital is maximum (50%) so this orbital is closer to nucleus.

Naturally it will have greater tendency to pull electron towards it.

Hence it becomes more electronegative and sp 3 becomes least electronegative as it has only 25% s-character.

Q107
Which one of the following orders correctly represents the increasing acid strengths of the given acids?
A HOClO < HOCl < HOClO 3 < HOClO 2
B HOClO 3 < HOClO 2 < HOClO < HOCl
C HOClO 2 < HOClO 3 < HOClO < HOCl
D HOCl < HOClO < HOClO 2 < HOClO 3
Correct Answer
Option D
Solution

As the oxidation number of the central atom increases, strength of acid also increases.

Q108
What is the correct relationship between the pH of isomolar solutions of sodium oxide, Na 2 O (pH 1 ), sodium sulphide, Na 2 S (pH 2 ), sodium srlenide, Na 2 Se (pH 3 ) and sodium telluride Na 2 Te (pH 4 )?
A pH 1 > pH 2 > pH 3 > pH 4
B pH 1 > pH 2 ≈ \approx pH 3 > pH 4
C pH 1 < pH 2 < pH 3 < pH 4
D pH 1 < pH 2 < pH 3 ≈ \approx pH 4
Correct Answer
Option A
Solution

Basic character decreases down the group Thus Na 2 O is most basic.

We know that more the basic compound more is the pH.

Hence, pH 1 > pH 2 > pH 3 > pH 4

Q109
Among K, Ca, Fe and Zn, the element which can from more than one binary compound with chlorine is
A Fe
B Zn
C K
D Ca
Correct Answer
Option A
Solution

A binary compound is one made of two different elements.

Metals which have variable oxidation number can form more than one type of binary compound like Fe shows the oxidation state +2 and +3.

Hence it forms two types of binary compounds. e.g., FeCl 2 , FeCl 3 .

Q110
Which one of the following statements about the zeolite is false?
A They are used as cation exchangers.
B They have open structure which enables them to take up small molecules.
C Zeolites are aluminosilicates having three dimensional network.
D Some of the SiO44−_4^{4 - } units are replaced by AlO45−_4^{5 - } and AlO69−_6^{9 - } ions in zeolites.
Correct Answer
Option D
Solution

Zeolites are alumino silicates having three dimensional open structure in which four or six membered ring predominates.

Thus, due to open chain structure, they have cavities and can take up water and other small molecules.

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