Ionization Enthalpy

Q.

Calculate the mass percent of different elements in sodium sulphate $N{a}_{2}S{O}_4$?

1. Mass% of Na is 32.5%, Mass% of S is 22.5%, Mass% of O is 45%

2. Mass% of Na is 45%, Mass% of S is 22.5%, Mass% of O is 32.5%

3. Mass% of Na is 22.5%, Mass% of S is 32.5%, Mass% of O is 45%

4. Mass% of Na is 32.5%, Mass% of S is 45%, Mass% of O is 22.5%

Q.

The ionization energy of nitrogen is more than that of oxygen because

1. Nitrogen has half filled p-orbitals

2. Nitrogen contains less number of electrons

3. Nitrogen is less electronegative

4. Nitrogen is left to the oxygen in the same period of the periodic table

Q.

Maximum number of electrons in a subshell with l = 3 and n = 4 is:

1. 14

2. 16

3. 10

4. 12

Q.

What is the difference between alkali and alkaline??

Q.

The element which has highest first ionization enthalpy in the periodic table is

1. H
2. Rn
3. He
4. F

Q. Among the following, third ionization enthalpy is highest for

1. beryllium
2. aluminium
3. magnesium
4. boron

Q.

First ionization enthalpy of two elements X and Y are $500kJmo{l}^{-}1$ and $375kJmo{l}^{-}1$respectively. Comment about their relative positive in a group as well as in a period.

Q.

Why do Noble gasses have high ionization energy?

Q.

Which one of the following configuration represents a noble gas?

1. 

2. 

3. 

4. 

Q.

Write the mass, charge and symbol of electron, proton and neutron.

Q.

Identify the elements X and Y using the ionization energy values given below:

Ionization energy (kJ/mol).

–	1st	2nd
X	495	4563
Y	731	1450

1. X = F; Y = Mg

2. X = Mg; Y = F

3. X = Na; Y = Mg

4. X = Mg; Y = Na

Q. Why the two outermost shell of transition elements are incomplete?

Q. Write the reasons responsible for the late discovery of noble gases.

Q.

Why boron and nitrogen are exceptions in periodic trends of electron affinity

Q. is the amount of energy required to remove the most loosely bound electron from the outermost shell of an isolated gaseous atom.

1. Electron affinity
2. Ionisation enthalpy
3. Kinetic energy
4. Electronegativity

Q.

Name two noble gases which exhibit the highest and lowest ionization energy.

Q.

Mention the first five elements of the periodic table having even atomic numbers. Logically choose the one with the maximum ionisation energy and explain your logic.

Q. what is the differnce between magnesium ion and magnesium atom

Q.

The second ionization potential of an element M is the energy required to

1. Remove one mole of electron from one mole of gaseous anion

2. Remove 2 moles of electrons from one mole of gaseous atoms

3. Remove one mole of electron from one mole of gaseous cation of the element

4. Remove one mole of electron from one mole of monovalent gaseous cation of the element

Q.

Calculate the percentage of sodium in sodium aluminium fluoride (Na₃AlF₆) correct to the nearest whole number.

(F= 19, Na = 23, Al = 27).

1. 35 %

2. 25 %

3. 33 %

4. 32 %

5. 21 %

Q.

Consider the following statements

I. The radius of an anion is larger than that of the parent atom.

II. The ionization energy generally increases with the increasing atomic number in a period.

III. The electronegativity of elements increases on moving down across a group.

Which of the above statements is correct?

1. I alone

2. II alone

3. I and II

4. II and III

Q.

The energy required to remove an electron of a gaseous atom from its ground state is called

1. Potential energy

2. Ionization energy

3. Electrode potential

4. Activation energy

Q. Why do halogens show a high tendency to make compounds with alkali metals and alkali earth metals

Q.

Ionisation Enthalpy $(\mathrm{\Delta }\mathrm{H})1\mathrm{Kj}{\mathrm{Mol}}^{-1})$ For The Elements Of Group 13 Follows The Order:

1. (A) $\mathrm{B}>\mathrm{Al}<\mathrm{Ga}>\mathrm{In}<\mathrm{Tl}.$

2. (B) $\mathrm{B}>\mathrm{Al}>\mathrm{Ga}>\mathrm{In}>\mathrm{Tl}.$

3. (C) $\mathrm{B}<\mathrm{Al}>\mathrm{Ga}<\mathrm{In}>\mathrm{Tl}.$

4. (D) $\mathrm{B}<\mathrm{Al}>\mathrm{Ga}>\mathrm{In}>\mathrm{Tl}.$

Q.

What are the similarities in properties of elements in halogen family ?

Q. Hydrogen is a non-metal but it is placed in reactivity series of metal. Why?

Q.

If an element with atomic number 'Z' is an inert gas. In which group would you place an element with atomic number (Z + 2) in the modern periodic table?

1. Group 1

2. Group 2

3. Group 4

4. Group 3

Q.

How can we measure the radius for noble gases?

Q. what is the trend of effective nuclear charge in a group and period ?

Q.

Which quantum number determines the radius of an atom?