1
AIEEE 2006
MCQ (Single Correct Answer)
+4
-1
Which of the following sets of ions represents a collection of isoelectronic species?
A
N3-, O2-, F-, S2-
B
Li+, Na+, Mg2+, Ca2+
C
K+, Cl-, Ca2+, Sc3+
D
Ba2+, Sr2+, K+, Ca2+
2
AIEEE 2006
MCQ (Single Correct Answer)
+4
-1
Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture?
A
The reactivity decreases in the alkali metals but increases in the halogens with increase in atomic number down the group
B
In both the alkali metals and the halogens the chemical reactivity decreases with increase in atomic number down the group
C
Chemical reactivity increases with increase in atomic number down the group in both the alkali metals and halogens
D
In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group
3
AIEEE 2006
MCQ (Single Correct Answer)
+4
-1
Which of the following molecules/ions does not contain unpaired electrons?
A
$$O_2^{2−} $$
B
B2
C
$$N_2^+$$
D
O2
4
AIEEE 2006
MCQ (Single Correct Answer)
+4
-1
In which of the following molecules/ions are all the bonds not equal?
A
XeF4
B
$$BF_4^−$$
C
SF4
D
SiF4
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