Covalent Radius

Q. Interhalogen compounds are more reactive than the individual halogens because:

1. two halogens are present in place of one
2. here bond energy is less than bond energy of the halogen molecule
3. they are more ionic
4. they carry more energy

Q. In $C{H}_{3}C{H}_{2}OH$, the bond that undergoes heterolytic cleavage most readily is

1. $C-C$
2. $C-O$
3. $C-H$
4. $O-H$

Q.

Statement I: Band gap in germanium is small.

Statement II: The energy spread of each germanium atomic energy level is infinitesimally small. (J2007, 3M)

1. Statement I is true; Statement II is true; Statement II is the correct explanation of Statement I.

2. Statement I is true; Statement II is true; Statement II is not the correct explanation of Statement I.
3. Statement I is false; Statement II is true.
4. Statement I is true; Statement II is false.

Q. The distance between any two $I$ atoms in $B{I}_3$ is found to be $3.46\stackrel{o}{A}$. What is the covalent radius of boron. If covalent radius of $I$ atom is $1.33\stackrel{o}{A}$? (Assume all bonds are single bonds in $B{I}_3$)
(Given, $\sqrt{3}=1.73,\sqrt{3}.99=1.99$)

1. $0.66\stackrel{o}{A}$
2. $1.77\stackrel{o}{A}$
3. $1.2\stackrel{o}{A}$
4. $1.32\stackrel{o}{A}$

Q. Given below are two statements labelled as Assertion (A) and Reason (R).
Assertion (A): Generally, interhalogen compounds are more reactive than halogens (except fluorine).
Reason (R): $X–X^{\prime }$ bond in interhalogens is weaker than $X–X$ bond in halogens except $F–F$ bond.
[0.77 Mark]

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

Q. In a planar tetra-atomic molecule $X{Y}_3$, $X$ is at the centroid of the equilateral triangle formed by the atoms, $Y$. If the $X-Y$ bond distance is $1A^{\circ }$. What is the distance between the centres of any two $Y$ atoms?

1. $\frac{1}{\sqrt{3}}\stackrel{o}{A}$
2. $\sqrt{2}\stackrel{o}{A}$
3. $\sqrt{3}\stackrel{o}{A}$
4. $\frac{1}{\sqrt{2}}\stackrel{o}{A}$

Q. In which of the following molecule, the number of possible $\angle XAX$ angles is maximum in the anionic part of their solid state? [$A:$ central atom, $X:$ surrounding atom]

1. $PB{r}_5$
2. $N_2{O}_3$
3. $PC{l}_5$
4. $C{l}_2{O}_6$

Q.

Name the members of alkali metal group which has the :

Highest melting point.

Q. The element which exists in a liquid state for a wide range of temperature and can be used for measuring high temperature is

1. Al
2. B
3. In
4. Ga

Q.

Students Ram, Shyam, and Raj measured the radius of an element A. The values of their practical were not the same
(Ram = 110 nm, Shyam = 190 nm and Raj = 108 nm).

Their teacher explained that their measurement was correct by saying that the recorded values are

1. Metallic, Van derwaal and covalent radii respectively

2. Covalent, Metallic and Van der waal radii respectively

3. Van der waal, Metallic and covalent radii respectively

4. None of the above

Q. Statement I Band gap in germanium is small.
Statement II The energy spread of each germanium atomic energy level is infinitesimally small.(J2007, 3M)

1. Statement I is true; Statement II is true; Statement II is the correct explanation of Statement I.

2. Statement I is true; Statement II is true; Statement II is not the correct explanation of Statement I.
3. Statement I is true; Statement II is false.
4. Statement I is false; Statement II is true.

Q. Why do noble gases have comparatively large atomic sizes?

Q.

Which of the following anions is most easily polarized?

1. Chloride

2. Bromide

3. Fluoride

4. Iodide

Q.

Why do noble gases have comparatively large atomic sizes?

Q. Which of the following elements has highest atomic radius ?

1. Mg
2. Si
3. Al
4. P

Q. Which is the smallest atom?
a. S
b. Si
c. P
d. He

Q. Which of the following is a highly polar bond?

1. $O-H$
2. $H-Cl$
3. $N-H$
4. $H-F$

Q. How many main energy level max can an atom have and as 4 main energy level have 4 sublevels s p d f is 5th main energy level has 5 sublevels if yes what are they

Q. Atomic radius decreases in a period, but after halogens, the atomic radius suddenly increases. Thus, inert gases has almost highest radius in a period. The explanation for such an increase is :

1. inert gases do not take part in bonding
2. Van der Waal's radius is reported in case of inert gases
3. none of these
4. inert gases has most stable configuration

Q. In which of the following pairs, the first atom or ion is not larger than the second?

1. $C{l}^{-},Cl$
2. $O,S$
3. $N,O$
4. $F{e}^{2+},F{e}^{3+}$

Q. "$Xe{F}_2$ is linear with two lone pairs of electrons on equatorial position."
Answer whether the above statement is true or false.
If true enter 1, else enter 0.

Q. Which of the following has a zero dipole moment?

1. $CFC{l}_3$
2. $ClF$
3. $PC{l}_3$
4. $Si{F}_4$

Q.

Being monoatomic, the atomic radii of noble gasses are very small compared to the covalent radii of other elements.

1. True

2. False

Q. Which of the following does not exhibit the periodicity in properties of the elements ?

1. Ionization energy
2. N/P ratio
3. Electronegativity
4. Atomic radius

Q.

Being monoatomic, the atomic radii of noble gasses are very small compared to the covalent radii of other elements.

1. True

2. False

Q.

Which among the following is the most reactive?

1. $C{l}_2$

2. $B{r}_2$

3. $l_2$

4. ICl

Q.

A covalent bond formation is favoured in which of the following cases:

1. A smaller cation

2. All of the above

   ​​​​​​​

3. A larger anion

4. Large charges on anion and cation

Q. The most stable complex among the following is:

1. $\left[Ag{\left(N{H}_3\right)}_2\right]Cl$
2. $K_2\left[Ni\left(EDTA\right)\right]$
3. $\left[Pt{\left(en\right)}_2\right]Cl$
4. $K_3\left[Al\left(C_2{O}_4\right)\right]$

Q.

Which of the following is the correct order in terms of covalent radius?

1. None of these

2. 

3. 

4.