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Classification of Elements and Periodicity in Properties

173 Questions Start Allen Test
All Exams Errorless Allen
Q51 Allen 3. Zeff, SCREENING CONSTANT & ATOMIC RADIUS MCQ
Which of the following order of atomic/ionic radius is not correct :-
A.
$\mathrm{I}^{-} > \mathrm{I} > \mathrm{I}^{+}$
B.
$\mathrm{Mg}^{+2} > \mathrm{Na}^{+} > \mathrm{F}^{-}$
C.
$\mathrm{P}^{+5} < \mathrm{P}^{+3}$
D.
$\mathrm{Li} > \mathrm{Be} > \mathrm{B}$
Q52 Allen 3. Zeff, SCREENING CONSTANT & ATOMIC RADIUS MCQ
In the lithium atom, screening effect of valence shell electron is caused by-
A.
Electrons of K and L shell
B.
Electrons of K shell
C.
Two electrons of $1^{st}$ and one of $2^{nd}$ shell
D.
None
Q53 Allen 3. Zeff, SCREENING CONSTANT & ATOMIC RADIUS MCQ
Correct order of ionic radii is
A.
$Ti^{4+} < Mn^{7+}$
B.
$^{37}Cl^{-} < ^{35}Cl^{-}$
C.
$K^{+} > Cl^{-}$
D.
$P^{3+} > P^{5+}$
Q54 Allen 3. Zeff, SCREENING CONSTANT & ATOMIC RADIUS MCQ
S $^{-2}$ is not isoelectronic with :-
A.
Ar
B.
Cl $^{-}$
C.
HS $^{-}$
D.
Ti $^{+3}$
Q55 Allen 3. Zeff, SCREENING CONSTANT & ATOMIC RADIUS MCQ
The best reason to account for the general tendency of atomic diameters to decrease as the atomic number increases within a period of the periodic table is the fact that
A.
Outer electrons repel inner electrons
B.
Closer packing among the nuclear particles is achieved
C.
The number of neutrons increases
D.
The increasing nuclear charge exerts a greater attractive force on the electrons
Q56 Allen 3. Zeff, SCREENING CONSTANT & ATOMIC RADIUS MCQ
In an anion :-
A.
Number of proton decreases
B.
Protons are more than electrons
C.
Effective nuclear charge is more
D.
Radius is larger than neutral atom
Q57 Allen 3. Zeff, SCREENING CONSTANT & ATOMIC RADIUS MCQ
Maximum size of first member of a period is due to
A.
Maximum number of shells
B.
Maximum screening effect
C.
Minimum $Z_{eff}$
D.
All
Q58 Allen 3. Zeff, SCREENING CONSTANT & ATOMIC RADIUS MCQ
Which of the following ion has largest size:-
A.
$\mathrm{F}^{-}$
B.
$\mathrm{Al^{+3}}$
C.
$\mathrm{Cs^{+}}$
D.
$\mathrm{O^{-2}}$
Q59 Allen 3. Zeff, SCREENING CONSTANT & ATOMIC RADIUS MCQ
Spot the incorrect order of atomic radii :-
A.
$r_{Cu > Zn}$
B.
$r_{Cl > F}$
C.
$r_{P > S}$
D.
$r_{Sc > Ti}$
Q60 Allen 3. Zeff, SCREENING CONSTANT & ATOMIC RADIUS MCQ
Incorrect statement is :-
A.
Atomic size $\propto$ $Z_{\mathrm{eff}}$
B.
Atomic size $\propto$ Negative charge
C.
Bond length $\propto$ Size of atoms
D.
Atomic size $\propto$ Screening effect
Q61 Allen 3. Zeff, SCREENING CONSTANT & ATOMIC RADIUS MCQ
Which of the following orders of atomic radii are correct :-
(a) Li < Be < Na (b) Ni < Cu < Zn
(c) Ti > V > Cr (d) Ti > Zr ≅ Hf
Correct answer is :-
A.
All
B.
a, b
C.
b, c
D.
b, d
Q62 Allen 3. Zeff, SCREENING CONSTANT & ATOMIC RADIUS MCQ
Decreasing order of size of ions is $\therefore$
A.
$\mathrm{Br}^{-} > \mathrm{S}^{-2} > \mathrm{Cl}^{-} > \mathrm{N}^{-3}$
B.
$\mathrm{N}^{3-} > \mathrm{S}^{-2} > \mathrm{Cl}^{-} > \mathrm{Br}^{-}$
C.
$\mathrm{Br}^{-} > \mathrm{Cl}^{-} > \mathrm{S}^{-2} > \mathrm{N}^{-3}$
D.
$\mathrm{N}^{-3} > \mathrm{Cl}^{-} > \mathrm{S}^{-2} > \mathrm{Br}^{-}$
Q63 Allen 3. Zeff, SCREENING CONSTANT & ATOMIC RADIUS MCQ
Which of the following statement is wrong:
A.
$Z_{\text{eff}}$ in group remains constant
B.
In a period atomic size decreases
C.
Screening effect in a period remains constant
D.
In a period atomic radius of inert gas element is maximum
Q64 Allen 3. Zeff, SCREENING CONSTANT & ATOMIC RADIUS MCQ
Which of the following sequence is correct for decreasing order of ionic radius :-
A.
Se $^{-2}$ , I $^{-}$ , Br $^{-}$ , O $^{-2}$ , F $^{-}$
B.
I $^{-}$ , Se $^{-2}$ , O $^{-2}$ , Br $^{-}$ , F $^{-}$
C.
Se $^{-2}$ , I $^{-}$ , Br $^{-}$ , F $^{-}$ , O $^{-2}$
D.
I $^{-}$ , Se $^{-2}$ , Br $^{-}$ , O $^{-2}$ , F $^{-}$
Q65 Allen 3. Zeff, SCREENING CONSTANT & ATOMIC RADIUS MCQ
According to Slater's rule, order of effective nuclear charge for last electron in case of Li, Na and K:-
A.
Li > Na > K
B.
K > Na > Li
C.
Na > Li > K
D.
Li < Na = K
Q66 Allen 4. IONISATION POTENTIAL MCQ
Correct orders of $1^{st}$ I.P. are :- (a) Li < B < Be < C (b) O < N < F (c) Be < N < Ne
A.
a, b
B.
b, c
C.
a, c
D.
a, b, c
Q67 Allen 4. IONISATION POTENTIAL MCQ
The ionisation potential of isotopes of an element will be :-
A.
Same
B.
Different
C.
Depends on atomic masses
D.
Depends on number of neutrons
Q68 Allen 4. IONISATION POTENTIAL MCQ
Compared to the first ionisation potential, the value of second ionisation potential of an element is :-
A.
Negligible
B.
Smaller
C.
Greater
D.
Double
Q69 Allen 4. IONISATION POTENTIAL MCQ
In which of the following pairs, the ionisation energy of the first species is less than that of the second :-
A.
O-, O $^{2-}$
B.
S, P
C.
N, P
D.
Be+, Be
Q70 Allen 4. IONISATION POTENTIAL MCQ
The correct order of stability of oxidation state of $Al^{+}$ , $Al^{+2}$ , $Al^{+3}$ is :-
A.
$Al^{+3} > Al^{+2} > Al^{+}$
B.
$Al^{+2} > Al^{+3} > Al^{+}$
C.
$Al^{+2} < Al^{+} > Al^{+3}$
D.
$Al^{+3} > Al^{+} > Al^{+2}$
Q71 Allen 4. IONISATION POTENTIAL MCQ
Least ionisation potential will be of:
A.
Be $^{3+}$
B.
H
C.
Li $^{+2}$
D.
He $^{+}$
Q72 Allen 4. IONISATION POTENTIAL MCQ
Ionisation energy increases in the order :-
A.
Be, B, C, N
B.
B, Be, C, N
C.
C, N, Be, B
D.
N, C, Be, B
Q73 Allen 4. IONISATION POTENTIAL MCQ
IP is influenced by -
A.
Size of atom
B.
Effective nuclear charge
C.
Electrons present in inner shell
D.
All
Q74 Allen 4. IONISATION POTENTIAL MCQ
Highest ionisation potential in a period is shown by
A.
Alkali metals
B.
Noble gases
C.
Halogens
D.
Representative elements
Q75 Allen 4. IONISATION POTENTIAL MCQ
Which of the following decreases in going down the halogen group :-
A.
Ionic radius
B.
Atomic radius
C.
Ionisation potential
D.
None of these