Covalent Radius

Q.

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

1. True

2. False

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 der Waals and covalent radii respectively

2. Covalent, Metallic and Van der Waals radii respectively

3. Van der Waals, Metallic and covalent radii respectively

4. None of the above

Q.

students Ram, Shyam and Raj measured the radius of an element A. The values of their practical were not same (Ram = 110 nm, Shyam = 190 nm and Raj = 108 nm). Their teacher explained that their measurement were 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.

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

1. A smaller cation

2. A larger anion

3. Large charges on anion and cation

4. All of the above

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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. Which of the following has biggest covalent radius?

1. As
2. P
3. S
4. Se

Q.

Why does the atomic size of noble gas elements increase abnormally

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.