Question

CHEMISTRY - C4 - PART-I
PERIODIC CLASSIFICATION
Which one of the following correctly represents the variation of electronegativity (EN) with atomic
number (Z) of group 13 elements ?
(EAMCET 2014)
EN
EN
In
idi
Sc (Z = 21) is a transition element but Zn (Z = 30) is not because
a) Both Sc and Zn do not exhibit variable oxidation states
b) Both Sc) and Znions are colourless and form white compounds
c) In case of Sc, 3d orbitals are partially filled but in Zn these are filled
d) Last electron is assumed to be added to 4s level in case of Zn
Iron exhibits + 2 and + 3 oxidation states. Which of the following statement about iron is incorrect ?
a) Ferrous oxide is more basic in nature than the ferric oxide
ICI
b) Ferrous compounds are relatively more ionic than the corresponding ferric compounds
c) Ferrous compounds are more easily hydrolysed than the corresponding ferric compounds
d) Ferrous compounds are less volatile than the corresponding ferric compounds
The increasing order of the ionic radii of the given isoelectronic species is
a) Cl - Ca2+, K+, S2- b) S?. CI , ca2+, K+ c) Ca2+, K+, Cl-, S2- d) K+, S2-. Ca2+ Cl -
30. Among the following inert gas elements, the element that shows highest chemical reactivity is
a) Xe
b) Ne
c) Ar
d) He
Which one of the following sets contribute to the global warming ?
a) H, NO, SO, b) SO, SO3, O2 c) N2, C,H, SO, d) CO,, CH, CFCs
32. Elements A, B and C belong to the same period in the long form of the periodic table. The nature of the
oxides of A, B and C is amphoteric, basic and acidic respectively. The correct order of the atomic
number of these elements is
a) B > A >C
b) C> B>A
c) C>A>B
d) A >B>C
Which one of the following is the correct order of the size of the ions ?
[ 1
a) 02->F-> Mg2+ > Na+
b) Na+ > Mg2+ > F >02-
c) 02->F-> Nat > Mg2+
d) Mg2+ > Na+ >F-> O2+
Which of the following orders of ionic radii is correctly represented ?
[ ]
a) 0-2>F > Na+ b) F->02-> Na+ c)AP+ > Mg2+> N3- d) H-> H >H
Beis isoelectronic with which of the following ions?
[ 1
b) Nat
c) Mg2+
d) H*
Magnetic moment 2.83 is given by which of the following ions ?
[ 1
(At. nos. Ti = 22, Cr= 24, Mn = 25, Ni = 28)
a) Ni?
b) Cr3+
c) Mn? +
d) Ti3+

Answer 1

Answer:

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