Chemistry - Classification of Elements and Periodicity in Properties
Exam Duration: 45 Mins Total Questions : 30
Which basic concept was used by Mendeleef for organising the elements?
- (a)
He organised the metals only
- (b)
He organised the non-metals only
- (c)
He organised the both metals and non-metals according to increasing number of masses
- (d)
None of the above
The period number in the long form of the periodic table is equal to
- (a)
magnetic quantum number of any element of the period
- (b)
atomic number of any element of the period
- (c)
maximum principal quantum number of any element of the period
- (d)
maximum azimuthal quantum number of any element of the period
What will be the IUPAC name of element having Z=106?
- (a)
Unniquadium
- (b)
Unnilhexium
- (c)
Unnilheptium
- (d)
Ununhexium
Any element having Z=33 belongs to the
- (a)
carbon family
- (b)
boron amily
- (c)
nitrogen family
- (d)
halogen family
Which of the following group elements belongs to chalcogens?
- (a)
N, P, As, Sb, Bi
- (b)
C, Si, Ge, Sn, Pb
- (c)
O,S,Se,Te, Po
- (d)
He, Ne, Ar, Kr, Xe, Rn
Which of the following is the correct order of size of the given species
- (a)
I>I-> I+
- (b)
I+ > I- > I
- (c)
I > I+ > I-
- (d)
I- > I > I+
Consider the isoelectronic species Na+, Mg2+, F- and O2-. The correct increasing order of their radii is .....
- (a)
F- < O2- < Mg2+ < Na+
- (b)
Mg2+ < Na+ < F- < O2-
- (c)
O2-<F-<Na+<Mg2+
- (d)
O2- < F- < Mg2+ < Na+
Which of the following has lowest value of ionisation energy?
- (a)
Mg
- (b)
Ca
- (c)
Ba
- (d)
Sr
Which of the following has highest ionisation potential?
- (a)
\([Ne]3s^2, 3p^2\)
- (b)
\([Ne]3s^2, 3p^3\)
- (c)
\([Ne]3s^2, 3p^1\)
- (d)
\([Ar]3d^{10}, 4s^2,4p^3\)
The correct order of increasing value of electron gain enthalpy among the following is
- (a)
O < S < F < Cl
- (b)
O < S < Cl < F
- (c)
S < O < F < Cl
- (d)
S < O < Cl < F
Which of the following has lowest electronegativity?
- (a)
N
- (b)
F
- (c)
Na
- (d)
K
Considering the elements B,C,N,F and Si, the correct order of their non-metallic character is
- (a)
B > C > Si > N >F
- (b)
Si > C > B > N > F
- (c)
F > N > C > B > Si
- (d)
F > N > C > Si > B
Considering the elements B, Al, Mg and K, the correct order of their metallic character is
- (a)
B > Al > Mg > K
- (b)
Al > Mg > B > K
- (c)
Mg > Al > K > B
- (d)
K > Mg > Al > B
Incorrect statement for periodic classification of element is
- (a)
The properties of elements are periodic function of their atomic numbers
- (b)
Non-metallic elements are less in number than metallic elements
- (c)
For transition elements, the 3d-orbitals are filled with electrons after 3p-orbitals and before 4s-orbital
- (d)
The first ionisation enthalpies of elements generally increase with increase in atomic number as we go along a period.
4s1, 3d10, 3d5 are the valence shell electronic configuration of ....... respectively.
- (a)
K, Ca, Cr
- (b)
K, Ca, Cu
- (c)
K, Cu, Cr
- (d)
Cu, Zn, Cr
General valence shell electronic configuration of valence and penultimate shell of any element is (n-1)s2(n-1)p6(n-1)dxns2
Given if n=5, x=6 then atomic number of element will be
- (a)
<44
- (b)
>44
- (c)
=44
- (d)
None of these
Which of the following is incorrect statement?
- (a)
Greater the value of nuclear charge, greater will be the electron gain enthalpy
- (b)
N has nearly to zero \(\Delta_{eg}\)H
- (c)
Electron gain enthalpy decreases from F to I
- (d)
CI has highest electron gain enthalpy
Which of the following is incorrect regarding ionisation enthalpy?
- (a)
Pb > Sn
- (b)
Na+ < Mg+
- (c)
Li+ > O+
- (d)
Be+ > C+
For which of the following the second IE is lower than first IE?
- (a)
Mg
- (b)
Ne
- (c)
C
- (d)
None of these
Which of the following requires least energy to show photoelectric effect?
- (a)
Cs
- (b)
Na
- (c)
Mg
- (d)
Cl
The electron affinity values (in kg mol-1) of three halogens X, Y and Z are -349, -333 and -325 respectively. Then X,Y and Z respectively are
- (a)
F2, Cl2 and Br2
- (b)
Cl2, F2 and Br2
- (c)
Cl2, Br2 and F2
- (d)
Br2, Cl2 and F2
Ionisation enthalpy of Na would be same as
- (a)
Value of electron affinity of Na+
- (b)
Value of electronegativity of Na
- (c)
Value of ionisation potential of Mg
- (d)
Value of electron affinity of Na
Match the following and choose the correct option.
| Column I | Column II |
|---|---|
| A.Al3+ < Mg2+ < Na+ < F- B. B < C < N \(\ge\)O C. I < Br < F < Cl D. Li < Na < K < Rb |
p.IE1 q. Ionic size r. Metallic radius s.Electron gain enthalpy |
- (a)
A B C D p q s r - (b)
A B C D q s p r - (c)
A B C D q p s r - (d)
A B C D r s p q
Which of the following represents the correct order o increasing first ionisation enthalpy for Ca, Ba,S,Se and Ar?
- (a)
Ca
- (b)
S
- (c)
Ba
- (d)
Ca
The first ionisation potential of Na is 5.1eV. The value of electron gain enthalpy of Na+ will be
- (a)
-2.55 eV
- (b)
-5.1 eV
- (c)
-10.2 eV
- (d)
+2.55 eV
The increasing order of the ionic radii of the given isoelectronic species is
- (a)
Cl-, Ca2+, K+, S2-
- (b)
S2-, Cl-, Ca2+, K+
- (c)
Ca2+, K+, Cl-, S2-
- (d)
K+, S2-, Ca2+, Cl-
Which one of the following set of cations represents a collection of isoelectronic species?
- (a)
K+, Cl-, Ca2+, Sc3+
- (b)
Ba2+, Sr2+, K+, S2-
- (c)
N3-, O2-,F-,S2-
- (d)
Li+,Na+,Mg2+,Ca2+
Which of the following is not a transuranic element?
- (a)
Am
- (b)
Gd
- (c)
Cm
- (d)
Cf
Anything that influences the valence electrons will affect the chemistry of the element. Which one of the following factors does not affect the valence shell?
- (a)
Valence principal quantum number (n)
- (b)
Nuclear charge (Z)
- (c)
Nuclear mass
- (d)
Number of core electrons
Which of the following is incorrect statement ?
- (a)
Greater the value of nuclear charge, greater will be the electron gain enthalpy
- (b)
N has nearly to zero \(\Delta_{eg}H\)
- (c)
Electron gain enthalpy decreases from F to I
- (d)
Cl has highest electron gain enthalpy
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