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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Which of the following order is correct for the property mentioned in brackets?

(a) S2->Cl->K+>Ca2+                 (Ionisation energy)

(b) C<N<F<O                              (2nd Ionisation energy)

(c) B>Al>Ga>In>Tl                     (Electronegativity)

(d)Na+>Li+>Mg2+>Be2+>Al3+    (Ionic radius)

Subtopic:  Ionization Energy (IE) |
 50%
From NCERT
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IP1 and IP2 for Mg are 178 and 348 Kcal mol-1 respectively. The energy required for the reaction, MgMg2+ + 2e- is :

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%
From NCERT
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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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The process requiring the absorption of energy is :

1. FF-

2. HH-

3. ClCl-

4. OO2-

Subtopic:  Electron Affinity (EA) |
 69%
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Consider the following statements:

(I) Rutherford name was associated with the development of periodic table.

(II) A metal M having electronic configuration 1s2, 2s2, 2p6, 3s2, 3p6 ,3d10, 4s1 is d-block element.

(III) Diamond is  an element.

(IV) The electronic configuration of the most electronegative elements is 1s2, 2s2, 2p5, 

and select the correct one from the given codes.

(A) I, II, IV                                      (B) I, II, III, IV

(C) II, IV                                         (D) I, III, IV

Subtopic:   Evolution of Periodic Table |
 64%
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There are four elements 'p', 'q', 'r' and 's' having atomic number Z-1, Z, Z+1 and Z+2 respectively. If there element 'q' is an inert gas, select the correct answers from the following statements.

(i) 'p' has most negative electron gain enthalpy in the respective period.

(ii) 'r' is an alkali metal.

(iii) 's' exists in +2 oxidation state.

(1) (i) and (ii)                     

(2) (ii) and (iii)

(3) (i) and (iii)                     

(4) (i), (ii) and (iii)

Subtopic:   Evolution of Periodic Table |
 77%
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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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Which of the following orders are correct for the ionization energies?

(A)  Ba < Sr < Ca                       (B) S2-<S <S2+

(C) C < O<N                            (D) Mg < Al < Si

1. A, B and D                             
2. A, C and D
3. A, B and C                             
4. A, B, C and D

Subtopic:  Ionization Energy (IE) |
 54%
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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) |
 75%
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