Page 369 - SUBSEC October 2017_Neat

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36. In descending Group II of the periodic 39. The decrease in volatility going down
table, the first ionization energy value of Group VII CANNOT be described by
the elements decreases. This is due to which of the following?
which two of the following?
(A) Strength of van der Waals forces
I. Atomic radius increases down the increases
group. (B) Electropositivity increases
II. Electrons are more delocalised as (C) Size of atoms increases
ionic radius decreases. (D) Molecular mass increases
III. Each succeeding atom has one
more quantum shell than the other.
40. A student tests an unknown sample
(A) I and II only with a few cm of AgNO (aq) followed
3
3
(B) I and III only by a few cm of dilute NH (aq). Which of
3
3
(C) II and III only the following observations would confirm
(D) I, II and III that the sample contains the Br¯ ion?

Precipitate Dissolves in dilute
37. Group IV elements show an increasing with AgNO NH
tendency towards metallic character as 3 3
atomic number increases. Which of the (A) white sparingly
following may account for this? (B) white readily
(C) off-white sparingly
I. The +2 state becomes more stable (D) off-white readily
than the +4 state.
II. The +4 state becomes more stable
than the +2 state. 41. Transition metal complexes contain a
III. The valence electrons in the +4 central metal atom or ion surrounded
state do not take part in bonding. by ligands. Which of the following does
NOT explain why these complexes are
(A) I only formed?
(B) II only
(C) III only (A) The presence of lone pairs of
(D) II and III only electrons on ligands
(B) The presence of vacant d-orbitals
on the metal atom or ion
38. Which of the following oxides of elements (C) The formation of covalent bonds
in Group IV is the LEAST acidic in between the metal and ligands
character? (D) The complex ion formed is stable
with respect to its constituents
(A) SnO 2
(B) PbO
(C) CO 2
(D) SiO
2

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