Electron Gain Enthalpy

Q.

A group $15$ element, which is a metal and forms a $\mathrm{hydride}$ with the strongest reducing power among group $15$ $\mathrm{hydrides}$. The element is:

1. $\mathrm{Bi}$

2. $\mathrm{As}$

3. $\mathrm{P}$

4. $\mathrm{Sb}$

Q. 25. Arrange order of electron gain enthalpy : 1.) Carbon silicon nitrogen phosphorus??

Q.

Which of the following is incorrect?

1. An element which has high electro negativity always has high electron gain enthalpy

2. Both electro negativity and electron gain enthalpy are usually directly related to nuclear charge and inversely related to atomic size

3. Electro negativity is the property of a bonded atom

4. Electron gain enthalpy is the property of an isolated atom

Q.

Second electron gain enthalpy

1. is always negative (energy is released)

2. can be positive or negative

3. is always positive (energy is released)

4. is always zero

Q. What is the difference between polar and non-polar compounds?

Q. According to the valence bond theory, greater will be the overlapping of orbitals, stronger will be the covalent bonds.

1. True
2. False

Q.

The correct order of electron gain enthalpy is :-

1. S > Se > Te > O

2. O > S > Se > Te

3. Te > Se > S > O

4. S > O > Se > Te

Q. Arrange the following elements in the order of increasing metallic character.

1. Beryllium
2. Barium
3. Strontium
4. Calcium
5. Magnesium

Q. How to decide maximum electron density on any aromatic compound?

Q. Boiling point also called enthalpy of atomisation true or false

Q. What is trend of electron affinity in periodic table?

Q. What are electro negativity and electron affinity? Please explain in detail

Q. The total number of lone pairs of electrons in melamine is
(IIT-JEE-2012)

1. 6
2. 4
3. 0
4. 2

Q. Atoms which give up electrons easily are called___ .

Q. Statement I: LiCl is predominantly a convalent compound.
Statement II: Electronegativity difference between Li and Cl is too small.
(IIT-JEE, 1998)

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

Q.

which element in periodic table has highest electronegativity & why?

Q. Which group does silicon belong to in the modern periodic table?

1. 13
2. 14
3. 15
4. 16

Q. Assertion :Electronegativity is a property that describes the tendency of an atom to attract electrons (or electron density) toward itself Reason: Metallic character is measured by electro-negativity, lesser the electronegativity, higher is the tendency to loose electron and higher is the metallic character.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. $H_{3}P{O}_2$ is a stronger reducing agent than $H_{3}P{O}_3$. Give reasons.

Q. Write balanced chemical equations for each of the following:
(i) Action of warm water on AlN.
(ii) Action of hot and concentrated Nitric acid on copper.
(iii) Action of Hydrochloric acid on sodium bicarbonate.
(iv) Action of dilute Sulphuric acid on Sodium Sulphite.
(v) Preparation of ethanol from Ethyl Chloride.

Q. In the modern periodic table, which of the following is the metal from first ten elements?

1. $H$
2. $Be$
3. $B$
4. $Na$

Q. Arrange the following elements in the order of increasing metallic character.

1. Barium
2. Magnesium
3. Calcium
4. Beryllium
5. Strontium

Q.

The ionization energy of $F^{-}$ is 320 kJ/mole. The electron gain enthalpy of fluorine would be?

1. -320 KJ/mole

2. -160 KJ/mole

3. 320 KJ/mole

4. 160 KJ/mole

Q.

For the processes $K^{+}\left(g\right)\stackrel{I}{⟶}K\left(g\right)\stackrel{II}{⟶}{K}^{-}\left(g\right)$

1. Energy is released in (I) and absorbed in (II)

2. Energy is absorbed in both the processes

3. Energy is absorbed in (I) and released in (II)

4. Energy is released in both the processes

Q. What is positive and negative gain enthalpy? What is their perodic trend in the periodic table?

Q.

Which of the following represents correct order of increasing electron gain enthalpy with negative sign for the elements 0, S, F and Cl? [CBSE AIPMT 2010]

1. CI< F< O< S

2. O< S< F< CI

3. F< S< O< CI

4. S< O< CI< F

Q. Can an electronegative atom bond with a metal

Q.

Electron gain enthalpy of $F^{-}$ is

1. -320 KJ mol

2. -160 KJ mol

3. 160 KJ mol

4. +320 KJ mol

Q.

If one electron has been removed from an atom, it becomes increasingly difficult to remove the second and subsequent electrons from the resulting positively charged ions on account of electrostatic attraction.
The numerical value of energy involved in the given process $K\to K^{-}$ is less than that of which of the following processes?

1. $K^{-}\to K$

2. $K\to K^{+}$

3. None of these

4. Both (a) and (b)

Q.

Electron gain enthalpy depends on:

1. Atomic size

2. Effective Nuclear charge

3. Screening or shielding effect

4. Stability of half filled and completely filled orbitals.