Electronic Configuration of Halogens

Q.

Which out of ${\mathrm{NH}}_3$ and ${\mathrm{NF}}_3$ has a higher dipole moment and why?

Q.

Which is more stable ${\mathrm{Fe}}^{2+}$or ${\mathrm{Fe}}^{3+}$?

Q. The number of lone pairs of electrons on the central I-atom in $I_3^{-}$ is

Q.

The atomic number of calcium is 20.So its electronic configuration is 2, 8, 8, 2.

1. True
2. False

Q.

What is the electron configuration of 59 Pr (Praseodymium)?

Q.

Which one of the following is the lightest?

1. 0.2 mole of hydrogen gas
2. 6.023×10²³ molecules of nitrogen
3. 0.1 g of silver
4. 0.1 mole of oxygen gas

Q.

What does S stand for on the periodic table?

Q. The shape of $I{F}_6^{-}$ is :

1. Trigonally distorted octahedron
2. Pyramidal
3. Octachedral
4. Square antiprismatic

Q. Which of the following is the product of bromination of benzene in presence of UV light?

1. $C_6{H}_{5}Br$
2. $C_6{H}_{6}B{r}_6$
3. o & p dibromobenzene
4. No reaction will be take place

Q.

The electronic configuration of chromium is__________.

Q. Which is the most likely product of bromination of 4-methylpent-2-ene with NBS and initiation by photolysis of a peroxide?

1. 
2. 
3. 
4. 

Q.

The element with atomic number = 35 is:

1. Fluorine

2. Chlorine

3. Bromine

4. Iodine

Q.

What name is assigned for elements from atomic number 58 to 71?

Q. Generally non-metals are non-lustrous. Exception to this property is-

1. Flourine
2. Chlorine
3. Bromine
4. Iodine

Q. Total number of lone pairs of electron in $I_3^{-}$ ion is:

1. $3$
2. $6$
3. $9$
4. $12$

Q. Maximum covalency of oxygen will be considered 4 or 2 ?

Q. Which of the following element has metallic lustre?

1. $Cl$
2. $F$
3. $Br$
4. $I$

Q. An element 'A' when combines with four F-atoms, forms $A{F}_4$ which has square planar shape and also has lone pair(s). Select correct statement with respect to compounds of A.

1. $A{F}_4$ is polar in nature
2. $A{F}_3^{+}$ has all identical bond
3. $A{F}_5^{+}$ has all identical bond
4. $A{F}_2$ has non-zero net dipole moment

Q. Calculate the effective nuclear charge of the last electron in an atom whose configuration is $1s^{2}2s^{2}2p^{6}3s^{2}3p^5$.

Q. Which of the following species has four lone pairs of electrons?

1. O
2. He
3. I
4. $C{l}^{-}$

Q.

The element with atomic number = 35 is:

1. Fluorine

2. Chlorine

3. Bromine

4. Iodine

Q.

What is the $s\mathit{,}\mathit{}p\mathit{,}\mathit{}d$ and $f$ configuration of $\mathrm{Co}$?

Q.

The atomic number of an element that belongs to the IVA group and 4th period is _____.

Q.

The number of unpaired electrons in ferrous ion is:

1. 2
2. 3
3. 4
4. 5

Q. Which of the following species has four lone pairs of electrons

1. $I$
2. $O$
3. $C{l}^{-}$
4. $He$

Q. The electronic configuration of halogen is :

1. $n{s}^{2}n{p}^6$
2. $n{s}^{2}n{p}^3$
3. $n{s}^{2}n{p}^5$
4. $n{s}^2$

Q.

The element with atomic number = 35 is:

1. Fluorine

2. Chlorine

3. Bromine

4. Iodine

Q. What is covalency of chlorine atom in second excited state ?

Q. How many unpaired electrons does the second excited state of halogens (= Cl, Br and I) have?

1. 5 unpaired electrons
2. 7 unpaired electrons
3. There is no second excitation possible for Cl, Br and I.
4. None of the above

Q. Which of the following has seven valence electrons?

1. $N{a}^{+}$
2. $Al$
3. $F$
4. $B$
5. $Ti$