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Questions
1
BITSAT 2024
MCQ (Single Correct Answer)
+3
-1
Electron affinity is positive, when
A
$ \mathrm{O}^{2} $ changes into $ \mathrm{O}^{-} $
B
$ \mathrm{O}^{-} $changes to $ \mathrm{O}^{2-} $
C
$ \mathrm{O}^{\text {changes into } \mathrm{O}^{+}} $
D
O changes to $ \mathrm{O}^{2+} $
2
BITSAT 2024
MCQ (Single Correct Answer)
+3
-1
The ionic radii in $ \mathring{A} $ of $ \mathrm{N}^{3-}, \mathrm{O}^{2-} $ and $ \mathrm{F}^{-} $are respectively.
A
$ 1.71,1.40 $ and 1.36
B
$ 1.71,1.36 $ and 1.40
C
$ 1.36,1.40 $ and 1.71
D
$ 1.36,1.71 $ and 1.40
3
BITSAT 2021
MCQ (Single Correct Answer)
+3
-1

Why only Xe can form compounds with fluorine among noble gases?

A
Large size
B
Low electronegativity
C
High ionisation energy
D
Low electron gain enthalpy
4
BITSAT 2020
MCQ (Single Correct Answer)
+3
-1

Following statements regarding the periodic trends of chemical reactivity to 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.
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