Expanded Octet

Q. SF6 and PCl5 are exceptions to octet rule because of

1. incomplete octet
2. expanded octet
3. electron pairs

Q.

In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below.

Assertion (A):

Among the $O-H$ bonds in $H_{2}O$ molecule, the energy required to break the first

$O-H$ bond and the other

$O-H$ bond is the same.

Reason (R):

This is because the electronic environment around oxygen is the same even after breakage of one $O-H$ bond.

1. A and R both are correct, and R is the correct explanation of A.

2. A is true but R is false.

3. A and R both are false.

4. A and R both are correct, but R is not the correct explanation of A.

Q. Assertion (A): If aluminium atoms replace a few silicon atoms in three dimensional network of silicon dioxide, the overall structure acquires a negative charge.

Reason (R): Aluminium is trivalent while silicon is tetravalent.

1. $A$ is not correct but $R$ is correct.
2. Both $A$ and $R$ are correct and $R$ is not the correct explanation of $A$.
3. Both $A$ and $R$ are not correct
4. Both $A$ and $R$ are correct and $R$ is the correct explanation of $A$

Q. An example of a super octet molecule is:

1. $S{F}_6$
2. $PC{l}_5$
3. $I{F}_7$
4. All of these

Q. Which of the following sets has all the species that do not follow octet rule?

1. $CO,PC{l}_5,PC{l}_3,AlC{l}_3$
2. $CO,B_2{H}_6,N{H}_3,H_{2}O$
3. $AlC{l}_3,B{F}_3,PC{l}_5,S{F}_6$
4. $H_{2}O,N{H}_3,C{O}_2,AlC{l}_3$

Q. The two elements X and Y have $5$ and $7$ valence electrons respectively, what will be the formula of the compound formed by them?

1. $X_{3}Y$
2. $XY$
3. $X_{2}Y$
4. $X{Y}_3$

Q. The molecule(s) that violate(s) the Lewis octet rule among the following is/are:

1. $N{O}_2$
2. $S{F}_4$
3. $BeC{l}_2$
4. All of the above

Q. Which of the following compounds contains unpaired electrons?

$K{O}_2,N{O}_2,S{O}_2,Ba{O}_2,Cl{O}_2,O_2,NO,N_{2}O,O_3,CO$

Q. Which of the following compounds contains unpaired electrons?

$K{O}_2,N{O}_2,S{O}_2,Ba{O}_2,Cl{O}_2,O_2,NO,N_{2}O,O_3,CO$

Q. To which of the following species, the octet rule is not applicable?

1. $Br{F}_5$
2. $S{F}_6$
3. $I{F}_7$
4. $C{O}_2$

Q. Write the structure of $H_2{SO}_4$

Q.

$S{F}_6$ and $PC{l}_5$ are exceptions to octet rule because of _____.

1. electron pairs

2. incomplete octet

3. odd electrons

4. expanded octet

Q. An example of a super octet molecule is:

1. $S{F}_6$
2. $PC{l}_5$
3. $I{F}_7$
4. All of these

Q. An example of a super octet molecule is:

1. $S{F}_6$
2. $PC{l}_5$
3. $I{F}_7$
4. All of these

Q. An example of a super octet molecule is:

1. $S{F}_6$
2. $PC{l}_5$
3. $I{F}_7$
4. All of these

Q. SF6 and PCl5 are exceptions to octet rule because of

1. incomplete octet
2. expanded octet
3. electron pairs

Q. If following molecules undergo dimerization then find the value of $\frac{YZ}{X}$.
(i) $Cl{O}_3$, (ii) $OF$, (iii) $Ga{H}_3$, (iv) $AlC{l}_3$, (v) $IC{l}_3$, (vi) $Be{H}_2$, (vii) $N{O}_2$Where,
$X=$ Number of molecules which are hypervalent in dimeric form.
$Y=$ Number of molecules which com octet in dimer form.
$Z=$ Number of molecules which are hypovalent in dimeric form.

Q. Which of the following sets has all the species that do not follow octet rule?

1. $CO,PC{l}_5,PC{l}_3,AlC{l}_3$
2. $CO,B_2{H}_6,N{H}_3,H_{2}O$
3. $AlC{l}_3,B{F}_3,PC{l}_5,S{F}_6$
4. $H_{2}O,N{H}_3,C{O}_2,AlC{l}_3$

Q.

$S{F}_6$ and $PC{l}_5$ are exceptions to octet rule because of _____.

1. electron pairs

2. incomplete octet

3. odd electrons

4. expanded octet