First three ionisation energies (in kJ/mol) of three representative elements are given below:

Element     IE1                    IE2                   IE3

P               495.8                4562                  6910
Q               737.7               1451                   7733
R               577.5                1817                  2745

Then incorrect option is :

1. Q: Alkaline earth metal.

2. P: Alkali metal.

3. R: s-block element.

4. All three: P,Q & R belong to the same period.

Subtopic:  Ionization Energy (IE) |
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If the ionization enthalpy and negative electron gain enthalpy of an element are 275 and 86 kcal mol-1 respectively, then the electronegativity of the element on the Pauling scale is:

1. 2.8                                     

2. 0.0

3. 4.0                                     

4. 2.6

Subtopic:  Ionization Energy (IE) |
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The incorrect match among the following options is : 

1. Ar3d54s1 4th period, 6th group

2.  Kr4d10 5th period, 12th group

3.  Rn6d27s2 7th period, 3th group

4.  Xe4f145d26s2 6th period, 4th group

 

Subtopic:  Electronic Configuration |
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IP1 and IP2 for Mg are 178 Kcal mol–1 and 348 Kcal mol-1, respectively. The energy required for the reaction, MgMg2+ + 2e- will be:

1. +170 Kcal mol-1

2. +526 Kcal mol-1

3. –170 Kcal mol-1

4. –526 Kcal mol-1

Subtopic:  Ionization Energy (IE) |
 75%
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Incorrect statement about characteristics regarding halogens is :

1. Ionization energy decreases with increase in atomic number.

2. Electronegativity decreases with increase in atomic number.

3. Electron affinity decreases with increase in atomic number.

4. Enthalpy of fusion increases with increase in atomic number. 

Subtopic:  Electron Affinity (EA) |
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Given below are four orders for the size of the species. Choose the correct ones :

(a) Al3+<Mg2+<Na+<F-

(b) Al3+<Mg2+< Li+<K+

(c) Fe4+<Fe3+<Fe2+<Fe

(d) Mg>Al>Si>P

1. (a), (b) & (c)                       

2. (b), (c) & (d)

3. (a), (c)                          

4. (a), (b), (c) & (d)

Subtopic:  Atomic Size |
 63%
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The electron gain enthalpies of halogens in kJ mol-1 are given below.

F =-332, Cl =-349, Br =-325, I =-295.

The lesser negative value for F as compared to that of Cl is due to:
 

1. Strong electron-electron repulsions in the compact 2p-subshell of F.

2. Weak electron-electron repulsions in the bigger 3p-subshell of Cl.

3. Smaller electronegativity value of F than Cl.

4. 1 & 2 both 

Subtopic:  Electron Affinity (EA) |
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The correct order among the following options is: 

1. F > N > C > Si > Ga - Non-metallic character.

2. F > Cl > O >N - Oxidising property.

3. C < Si > P > N  - Electron affinity value.

4. All of the above.

Subtopic:  Nature of Compound |
 67%
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In alkaline earth metals, the properties, from the following, that will increase from Be to Ba are-

(i) Atomic radius       
(ii) Ionisation energy       
(iii) Nuclear charge

1. (i) and (ii) 2. (i) and (iii)
3. (ii) and (iii) 4. (i), (ii), and (iii)
Subtopic:  Atomic Size |
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The process that requires absorption of energy is:

1. NN-                       

2. FF-

3. ClCl-                     

4. HH-

Subtopic:  Electron Affinity (EA) |
 61%
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