Select Board & Class
what is diagonal relationship?explain its causes.
pls.explain why fluorine has less negative electron gain enthalpy than chlorine.
what is polarising power?
what is penultimate shell
Why do we need to classify elements?
In which of the following sets elements have nearly same atomic radii and why??
a)Fe,Co,Ni,Cu
b)O,S,Se,Te
c)Mg,Ca,Cr,Ba
d)Li,Be,B,C
HOW WOULD YOU JUSTIFY THE PRESENCE OF 18 ELEMENTS IN THE FIFTH PERIOD OF THE PERIODIC TABLE?
which of the following represents most electropositive element
a- [He]2s1
b-[He]2s2
c-[Xe]6s1
d- [Xe]6s2
explain the electron gain enthalpy?
which is the largest element in the periodic table? why?
oxidation state and covalency of aluminium in (AlCl(H2O)5)+2 are same or differrent? justify
what is ionization enthalpy
what are the drawbacks of the long form periodic table?
what is the difference between valency and covalency.
What is meant by Unipositive and Dipositive ion?
Difference between Electronegativity and Electron Gain Enthalpy..??
Explain the diagonal relation ship between Li and Mg
Is there any trick 2 learn periodic table?
which of the following periodic properties has no unit?
a- ionization enthalpy
b- atomic radius
c- electronegativity
d- electron gain enthalpy
please explain why chlorine is more electonegative than flourine however in p-block metallic character increses? please don't repeat the same answer.
which one has more metallic character - beryllium or aluminium ?
What is electron gain enthalpy?How does it vary in group and period?explain.
Consider the following species :
N3-, O2-, F-, Na+, Mg2+ and Al3+
(a) What is common in them?
(b) arrange them in the increasing ionic radii?
what is differentiating electron
The first member of the lanthanide series is lanthanum . True / False
WHICH HAS HIGHER LATTICE ENTHALPY AND WHY?
MgO AND NaCl
Mg2+ ion is smaller than O2- ion although both have same electronic configuration..why??
define strength of a solution?
What do we mean by Reducing nature and oxidising nature? Please explain with help of examples and in detail too. Thank you.
Are the oxidation state and covalency of Al in [AlCl(H2O)6]2+ same??
Out of Na and Na+ which one has larger size and why?
which of the following ions has largest radius?
a- O2-
b- Mg2+
c- Na+
d- F-
Which is stable O22+ or O22-, And Why ?
which of the following is arrange in the order of decreasing electropositive character
a-Fe, Mg, Cu
b- Mg,Cu,Fe
c-Mg,Fe,Cu
d-Cu,Fe,Mg
The electron gain enthalpy values of halogens become more negative in the order F>Cl>Br>I.
Comment on this statement
How to calculate screening constant for a given element ????
Which of the following is not an oxide ore?
A) Haematite B) siderite C) Bauxite D) Pyrolusite
02. Which of the following is not an ore of aluminium?
A) Cryolite B) Feldspar C) Bauxite D) Azurite
03. Which of the following represents an oxidation only change?
A) Cu2+ (aq) + 2e---------> Cu (g) B) Mg (s) + Fe 2+ (aq) ---------> Mg2+ (aq) + Fe(s)
C)Cl2 (aq) + 2e---------> 2Cl (aq) D) Zn (s) -- 2e- ------> Zn2+ (aq)
What is meant by penetration effect of the electrons?
why o has lower ionisation enthalpy than N and F?
Why are f-block elements called "Inner-transition elements" ?
why does cl have more negative electron gain enthalpy than F ?
Ca2+ is isoelectronic with
a- Mg2-
b-Kr-
c-Ar
d-Na+
The order of first electron affinity of O , S and Se :-
(A) O>S>Se (B) S>Se>O (C) Se>O>S (D) S>O>Se
explain why the s-block elements are very reactive.
True / False :
(A) No. of electrons having l = 0 in Pd is 10.
(B)The value of Zeff. for 3rd electron of Cr & Mn is same as no. of electron in 'd' subshell are same.
(C) Multiplicity of Fe is equal to Ni2+
Why group 1 elements are called alkali metals?Why Group 2 elements are called alkali earth metals?
nitroge has positive electron gain enthalpy whereas oxygen has negative,however oxygen has lower ionization enthalpy than nitrogen.explain.
Arrange the following ions in the order of increasing size.
Be2+, Cl- ,S2- ,Na+, Mg2+,Br-
Also please explain why?
why group 17 elements called halogens...
Alkali metals have largest atomic volume in their period--is this true?
Electron gain enthalpy of Oxygen and Fluorine is less negative than suceeding element S and Cl. Why?
account the following:
a)ionization enthalpy of nitrogen is greater than that of oxygen
b)atomic radius decreses from left to right in a period
c)electron gain enthalpy of fluorine is less negative than that of chlorine
What is Covalency?How to find the covalency of any element
the value of IP1, IP2 , IP3 and IP4 of an atom are respectively 7.5 eV, 25.6 eV , 48.6 eV, 170.6 eV. the electronic configuration of the atom will be--
A) 1s2,2s2,2p6,3s1
B)1s2,2s2,2p6,3s2,3p1
C)1s2,2s2,2p6,3s2,3p3
D)1s2,2s2,2p6,3s2
Pls. ans.
why is second ionization enthalpy greater than first ionization enthalpy?pls.explain
neon has got more atomic radius than flourine.How?
Explain why halogens have maximum electron gain enthalpy in their respective periods.
what are typical elements and how do they differ from transision elements
FULL FORM OF METAL
what is a parent atom?
CH4 , H2O , NH3 order of increasing bond angle around central atom
what is dsp 2 hybridization
What is meant by predominantly ionic?
How does atomic radius vary in a period and in a group ? How yoy explain the variation ?
increasing order of atomic radii of the elements B, Al, C, Si, is
a- si, al, c, b
b- B, C, Al,Si,
c- Al, Si, B, C
D- C, B, Si, Al
how to calculate covalency?
electronic configuration of x+2 and y+3 are: x+2= [Ar] 3d8 , y+3= [Ar]3d3. what are the atomic number of x0 and y0 resp.
A)28,24 B) 28,25 C)28,26 D)28,87
ans..C) 28,26...........how??
how we can learn periodic table fast n easily ????????plz give me ur suggstions frzzzzz
the first ionisation energy of nitrogen is greater then that of oxygen , whereas the second ionisation energy of oxygen is greater than nitrogen....WHY..??????
which of the following elements represents highly electropositive as well as electronegative character in its period
a-hydrogen
b- nitrogen
c-fluorine
d- none
E.g: 9876543210, 01112345678
We will give you a call shortly, Thank You
Office hours: 9:00 am to 9:00 pm IST (7 days a week)
Syllabus
what is diagonal relationship?explain its causes.
pls.explain why fluorine has less negative electron gain enthalpy than chlorine.
what is polarising power?
what is penultimate shell
How is it that in Schomaker and Stevenson's formula for atomic radii in case of covalent bond subtracts electonegativity (k cal/mol) from radius (angstrom) ???
Why do we need to classify elements?
In which of the following sets elements have nearly same atomic radii and why??
a)Fe,Co,Ni,Cu
b)O,S,Se,Te
c)Mg,Ca,Cr,Ba
d)Li,Be,B,C
HOW WOULD YOU JUSTIFY THE PRESENCE OF 18 ELEMENTS IN THE FIFTH PERIOD OF THE PERIODIC TABLE?
which of the following represents most electropositive element
a- [He]2s1
b-[He]2s2
c-[Xe]6s1
d- [Xe]6s2
explain the electron gain enthalpy?
which is the largest element in the periodic table? why?
oxidation state and covalency of aluminium in (AlCl(H2O)5)+2 are same or differrent? justify
1. Li , Be , B , C , N , O , F , Ne
2. Na , Mg , Al , Si , P , S , Cl , Ar
what is ionization enthalpy
what are the drawbacks of the long form periodic table?
what is the difference between valency and covalency.
What is meant by Unipositive and Dipositive ion?
Difference between Electronegativity and Electron Gain Enthalpy..??
Q. (b) Explain the variation of first ionization energy in F, O, N and C.
Explain the diagonal relation ship between Li and Mg
Is there any trick 2 learn periodic table?
which of the following periodic properties has no unit?
a- ionization enthalpy
b- atomic radius
c- electronegativity
d- electron gain enthalpy
please explain why chlorine is more electonegative than flourine however in p-block metallic character increses? please don't repeat the same answer.
which one has more metallic character - beryllium or aluminium ?
What is electron gain enthalpy?How does it vary in group and period?explain.
Consider the following species :
N3-, O2-, F-, Na+, Mg2+ and Al3+
(a) What is common in them?
(b) arrange them in the increasing ionic radii?
what is differentiating electron
The first member of the lanthanide series is lanthanum . True / False
WHICH HAS HIGHER LATTICE ENTHALPY AND WHY?
MgO AND NaCl
Mg2+ ion is smaller than O2- ion although both have same electronic configuration..why??
define strength of a solution?
What do we mean by Reducing nature and oxidising nature? Please explain with help of examples and in detail too. Thank you.
Are the oxidation state and covalency of Al in [AlCl(H2O)6]2+ same??
Out of Na and Na+ which one has larger size and why?
which of the following ions has largest radius?
a- O2-
b- Mg2+
c- Na+
d- F-
Which is stable O22+ or O22-, And Why ?
which of the following is arrange in the order of decreasing electropositive character
a-Fe, Mg, Cu
b- Mg,Cu,Fe
c-Mg,Fe,Cu
d-Cu,Fe,Mg
The electron gain enthalpy values of halogens become more negative in the order F>Cl>Br>I.
Comment on this statement
Q.(c) What is electronegativity? Explain why halogens possess highest electronegativity.
How to calculate screening constant for a given element ????
Which of the following is not an oxide ore?
A) Haematite B) siderite C) Bauxite D) Pyrolusite
02. Which of the following is not an ore of aluminium?
A) Cryolite B) Feldspar C) Bauxite D) Azurite
03. Which of the following represents an oxidation only change?
A) Cu2+ (aq) + 2e---------> Cu (g) B) Mg (s) + Fe 2+ (aq) ---------> Mg2+ (aq) + Fe(s)
C)Cl2 (aq) + 2e---------> 2Cl (aq) D) Zn (s) -- 2e- ------> Zn2+ (aq)
What is meant by penetration effect of the electrons?
why o has lower ionisation enthalpy than N and F?
Why are f-block elements called "Inner-transition elements" ?
why does cl have more negative electron gain enthalpy than F ?
Ca2+ is isoelectronic with
a- Mg2-
b-Kr-
c-Ar
d-Na+
The order of first electron affinity of O , S and Se :-
(A) O>S>Se (B) S>Se>O (C) Se>O>S (D) S>O>Se
explain why the s-block elements are very reactive.
True / False :
(A) No. of electrons having l = 0 in Pd is 10.
(B)The value of Zeff. for 3rd electron of Cr & Mn is same as no. of electron in 'd' subshell are same.
(C) Multiplicity of Fe is equal to Ni2+
Why group 1 elements are called alkali metals?
Why Group 2 elements are called alkali earth metals?
nitroge has positive electron gain enthalpy whereas oxygen has negative,however oxygen has lower ionization enthalpy than nitrogen.explain.
Arrange the following ions in the order of increasing size.
Be2+, Cl- ,S2- ,Na+, Mg2+,Br-
Also please explain why?
why group 17 elements called halogens...
Alkali metals have largest atomic volume in their period--is this true?
Electron gain enthalpy of Oxygen and Fluorine is less negative than suceeding element S and Cl. Why?
Q. (d) Calculate the ionization energy of . (Given that ionization energy of H is 13.6 eV.)
account the following:
a)ionization enthalpy of nitrogen is greater than that of oxygen
b)atomic radius decreses from left to right in a period
c)electron gain enthalpy of fluorine is less negative than that of chlorine
What is Covalency?How to find the covalency of any element
the value of IP1, IP2 , IP3 and IP4 of an atom are respectively 7.5 eV, 25.6 eV , 48.6 eV, 170.6 eV. the electronic configuration of the atom will be--
A) 1s2,2s2,2p6,3s1
B)1s2,2s2,2p6,3s2,3p1
C)1s2,2s2,2p6,3s2,3p3
D)1s2,2s2,2p6,3s2
Pls. ans.
why is second ionization enthalpy greater than first ionization enthalpy?pls.explain
neon has got more atomic radius than flourine.How?
Q. 132. In which of the following pairs of elements the electronegativity of the first element is less than that of second element :-
(1) Zr, Hf
(2) K, Rb
(3) Cl, S
(4) None of the above
Explain why halogens have maximum electron gain enthalpy in their respective periods.
a Na2O b Al2O3 c P2O5 d SO3
what are typical elements and how do they differ from transision elements
A) acidic
B) neutral
C) basic
D) amphoteric
FULL FORM OF METAL
what is a parent atom?
CH4 , H2O , NH3 order of increasing bond angle around central atom
Chlorine or nitrogen
what is dsp 2 hybridization
What is meant by predominantly ionic?
How does atomic radius vary in a period and in a group ? How yoy explain the variation ?
increasing order of atomic radii of the elements B, Al, C, Si, is
a- si, al, c, b
b- B, C, Al,Si,
c- Al, Si, B, C
D- C, B, Si, Al
how to calculate covalency?
electronic configuration of x+2 and y+3 are: x+2= [Ar] 3d8 , y+3= [Ar]3d3. what are the atomic number of x0 and y0 resp.
A)28,24 B) 28,25 C)28,26 D)28,87
ans..C) 28,26...........how??
how we can learn periodic table fast n easily ????????plz give me ur suggstions frzzzzz
the first ionisation energy of nitrogen is greater then that of oxygen , whereas the second ionisation energy of oxygen is greater than nitrogen....WHY..??????
which of the following elements represents highly electropositive as well as electronegative character in its period
a-hydrogen
b- nitrogen
c-fluorine
d- none