201.
Fill in the blanks by picking the correct option.
There are ________ groups and ________ periods in the extended form of periodic table. The group, all members of which are in gaseous state under ordinary conditions is ________ group. Most electropositive elements belong to ________ group.
A
16, 8, 17, 2
B
18, 7, 18, 1
C
8, 7, 0, 2
D
16, 8, 18, 1
Answer :
18, 7, 18, 1
202. $$(A), (B)$$ and $$(C)$$ are elements in the third short period. Oxide of $$(A)$$ is ionic, that of $$(B)$$ is amphoteric and of $$(C)$$ a giant molecule. $$(A), (B)$$ and $$(C)$$ have atomic number in the order
A
$$\left( A \right) < \left( B \right) < \left( C \right)$$
B
$$\left( C \right) < \left( B \right) < \left( A \right)$$
C
$$\left( A \right) < \left( C \right) < \left( B \right)$$
D
$$\left( B \right) < \left( A \right) < \left( C \right)$$
Answer :
$$\left( A \right) < \left( B \right) < \left( C \right)$$
203. In the long form of the periodic table, the valence shell electronic configuration of $$5{s^2}5{p^4}$$ corresponds to the element present in :
A
Group 16 and period 6
B
Group 17 and period 6
C
Group 16 and period 5
D
Group 17 and period 5
Answer :
Group 16 and period 5
204. The decreasing order of the ionization potential of the following elements is
A
$$Ne > Cl > P > S > Al > Mg$$
B
$$Ne > Cl > P > S > Mg > Al$$
C
$$Ne > Cl > S > P > Mg > Al$$
D
$$Ne > Cl > S > P > Al > Mg$$
Answer :
$$Ne > Cl > P > S > Mg > Al$$
205. The species $$Ar,{K^ + }$$ and $$C{a^{2 + }}$$ contain the same number of electrons. In which order do their radii increase?
A
$$Ar < {K^ + } < C{a^{2 + }}$$
B
$$C{a^{2 + }} < Ar < {K^ + }$$
C
$$C{a^{2 + }} < {K^ + } < Ar$$
D
$${K^ + } < Ar < C{a^{2 + }}$$
Answer :
$$C{a^{2 + }} < {K^ + } < Ar$$
206.
What are the two radii shown as $$'a'$$ and $$'b'$$ in the figure known as?
A
$$a =$$ Atomic radius, $$b =$$ Molecular radius
B
$$a =$$ Covalent radius, $$b =$$ van der Waals' radius
C
$$a =$$ Ionic radius, $$b =$$ Covalent radius
D
$$a =$$ Covalent radius, $$b =$$ Atomic radius
Answer :
$$a =$$ Covalent radius, $$b =$$ van der Waals' radius
207. Which transition involves maximum amount of energy ?
A
$${M^ - }\left( g \right) \to M\left( g \right) + {e^ - }$$
B
$${M^ - }\left( g \right) \to {M^ + }\left( g \right) + 2{e^ - }$$
C
$${M^ + }\left( g \right) \to {M^{2 + }}\left( g \right) + {e^ - }$$
D
$${M^{2 + }}\left( g \right) \to {M^{3 + }}\left( g \right) + {e^ - }$$
Answer :
$${M^{2 + }}\left( g \right) \to {M^{3 + }}\left( g \right) + {e^ - }$$
208. $${K^ + }$$ and $$C{l^ - }$$ ions are isoelectronic. Which of the statements is not correct?
A
Both $${K^ + }$$ and $$C{l^ - }$$ ions contain 18 electrons.
B
Both $${K^ + }$$ and $$C{l^ - }$$ ions have same configuration.
C
$${K^ + }$$ ion is bigger than $$C{l^ - }$$ ion in ionic size.
D
$$C{l^ - }$$ ion is bigger than $${K^ + }$$ ion in size.
Answer :
$${K^ + }$$ ion is bigger than $$C{l^ - }$$ ion in ionic size.
209. In crystals of which of the following ionic compounds would you expect maximum distance between centres of cations and anions?
A
$$LiF$$
B
$$CsF$$
C
$$Csl$$
D
$$Lil$$
Answer :
$$Csl$$
210.
The van der Waal and covalent radii of fluorine atom respectively from the following figure are.
A
$$219\,pm,72\,pm$$
B
$$75\,pm,72\,pm$$
C
$$147\,pm,\,72\,pm$$
D
$$147\,pm,\,144\,pm$$
Answer :
$$147\,pm,\,72\,pm$$