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Champ Jee
Subject: Chemistry
, asked on 9/6/18
Ans : option c
How? Please explain each and every point.:
13. Carefully read the following four statements related to Slater's rule and identify them as True (T) or False (F).
I - Z
eff
value for the valence s-electron increases more rapidly, in moving left to right in a period, in 's' and 'p' block elements compared to d-block elements.
II - Z
eff
value for the outermost s-orbital of f-block elements, becomes constant irrespective of the number of (n-2)f - electrons and this contradicts f- contraction. This fact can be said to be a drawback of Slater's rule.
III -The Slater's rule does not take into account, the relative penetrating power of s and p-orbitals.
IV - In general, for the d-block elements of 3d-series, the value of Z
eff
increases by 0.65 unit per element.
(A) TFTF (B) TFFF (C) TTTF (D) FTTF
Answer
1
Champ Jee
Subject: Chemistry
, asked on 9/6/18
Q15.
Ans: option 4.
How?
Q.55. For which of the elements of different groups, the change in nonpolar covalent radii is maximum ?
(1) Groups 1 and 2
(2) Groups 14 and 15
(3) Groups 16 and 17
(4) Groups 17 and 18
Answer
1
Aayushi
Subject: Chemistry
, asked on 14/12/17
The correct order of radius for
Al,Ge,Pb,Sn,B
Answer
1
Raj Kothari
Subject: Chemistry
, asked on 13/11/17
The five successive ionization energies of the element are 800, 2427, 3658, 25024 and 32824 kJ mol
–l
respectively. The number of valence electrons is:
(A) 3 (B) 5 (C) 4 (D) 2
Answer
1
Raj Kothari
Subject: Chemistry
, asked on 10/10/17
1st one
Q.1. Which of the following is not a Dobereiner triad ?
(a) Cl, Br, I
(b) Ca, Sr, Ba
(c) Li, Na, K
(d) Fe, Co, Ni
Answer
5
Essa Amir Hamza Khan
Subject: Chemistry
, asked on 30/3/17
how will you obtain the folloeing form benzene:[1]hexachlorobenzene
Answer
1
Essa Amir Hamza Khan
Subject: Chemistry
, asked on 30/3/17
how will you obtain the following form benzene.
1]glyoxal[2]BHC
Answer
1
Essa Amir Hamza Khan
Subject: Chemistry
, asked on 30/3/17
explain the structure of acetylene
Answer
2
Param
Subject: Chemistry
, asked on 25/3/17
How will you prepare
Na2co3
Nahco3
Caco3
Answer
1
Saba Siddiqui
Subject: Chemistry
, asked on 21/2/17
What is meant by electron density?also why is electron density poor in d and f orbitals?
Answer
2
Hemantkumar Gidewar
Subject: Chemistry
, asked on 5/12/16
What has more lattice energy amongst
BaO and SrO
Please explain..
Answer
2
Hemantkumar Gidewar
Subject: Chemistry
, asked on 19/11/16
why Cu+ is more polarisble than Na+?
Answer
1
Hemantkumar Gidewar
Subject: Chemistry
, asked on 19/11/16
Why mercury chloride is more covalent than cadmium and zinc chloride?
Answer
1
Saba Siddiqui
Subject: Chemistry
, asked on 12/8/16
What will be the answer?
Answer
2
Saba Siddiqui
Subject: Chemistry
, asked on 6/8/16
Please explain this immediately, ma'am / sir.
Answer
1
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What are you looking for?
How? Please explain each and every point.:
13. Carefully read the following four statements related to Slater's rule and identify them as True (T) or False (F).
I - Zeff value for the valence s-electron increases more rapidly, in moving left to right in a period, in 's' and 'p' block elements compared to d-block elements.
II - Zeff value for the outermost s-orbital of f-block elements, becomes constant irrespective of the number of (n-2)f - electrons and this contradicts f- contraction. This fact can be said to be a drawback of Slater's rule.
III -The Slater's rule does not take into account, the relative penetrating power of s and p-orbitals.
IV - In general, for the d-block elements of 3d-series, the value of Zeff increases by 0.65 unit per element.
(A) TFTF (B) TFFF (C) TTTF (D) FTTF
Ans: option 4.
How?
Q.55. For which of the elements of different groups, the change in nonpolar covalent radii is maximum ?
(1) Groups 1 and 2
(2) Groups 14 and 15
(3) Groups 16 and 17
(4) Groups 17 and 18
Al,Ge,Pb,Sn,B
respectively. The number of valence electrons is:
(A) 3 (B) 5 (C) 4 (D) 2
Q.1. Which of the following is not a Dobereiner triad ?
(a) Cl, Br, I
(b) Ca, Sr, Ba
(c) Li, Na, K
(d) Fe, Co, Ni
1]glyoxal[2]BHC
Na2co3
Nahco3
Caco3
BaO and SrO
Please explain..